ford 9 inch rear end gear ratios chart

The instructions below will walk you through the steps. Here is the step by step guide: The Safety Standard Certification/ Safety Compliance Certification label is located on the door pillar of the left driver seat of your truck. Gear Ratios Drag Strip Performance - 1/8 Mile Horsepower Requirements from MPH - 1/8 Mile Horsepower Requirements from ET - 1/8 Mile ET from MPH - MPH - Km/H in 1/4 Mile using Horsepower Axle Ratio = (RPM X Tire Size)/ (Speed (MPH) X 336) Example 4.88 = (2881 X 37)/ (65 X 336) Code Application Ring Gear And Pinion NL or L Axle Shaft Splines Additional Information; Ratio: Diameter of RG: WGA-A: Lincoln Mark Series '69-'71 Thunderbird '69-70: 2.80: 9 3/8: NL: 31-WGA-B: Lincoln Mark Series '69-'71 9-Inch Standard Ring And Pinion Gear Sets (3.00 to 6.50 Ratios) $240.00. The typical 3 inch-diameter tubes can be a bit flimsy in higher-power applications. widths I keep in mind for Mustangs are the following: 52" Dec 1, 2011. The 8.8 is a traditional semi-fl oat Salisbury axle with C-washers for axle retention. Some differential experts tell you that the Blue Oval engineers copied the 12-bolt design when they came up with the 8.8-inch axle. Calculating the torque multiplication that your axle gears provide is quite easy. Ford non-overdrive transmissions include: C-4, three-speed, automatic. The format has changed over the years but mostly follow this sequence:. The exception is the 2002-2003 Ford Explorer Sport which still used the solid rear 8.8-Inch axle. Automotive Technical and Reference Information, Project Cars, Trucks and Salvage Vehicles For Sale, 1967-1970 Mustang, Fairlane, Comet, Cougar, 1967-1971 Comet, Cougar, Mustang, Fairlane, 1967-1973 Mustang, Torino, Ranchero, Fairlane, 1967-1973 medium and big block Mustang and Cougar, 1966-1971 Fairlane, Torino, Montego, Comet, and other Fords with big-block engines, 1977-1981 Lincoln Versailles and Trucks . is the strongest factory case made BY FORD!!! Ford 9 inch Gears. Content. Because of the long production history of this axle, many variants are available. Produced from 1957 to 1987 by the Ford Motor Company, it was used in full size . The N cases had two vertical ribs, three horizontal ribs, and a machined-in fill plug. These first became available on the 1964 Galaxies with the 427-ci engine and were found on many higher horsepower cars and trucks. Additionally, the Ford 9-inch utilizes a removable center section, often referred to as the Ford 9-inch pumpkin, Ford 9-inch chunk, Ford 9 inch third member, or even a Ford 9-inch pig! Notice that the date code is C9UA with the ring gear size of 8.7. Where A=the first number (static reduction), Bi=Gear diameter, Bf=Ring Gear diameter, Cf= (Crown Wheel dia.) Here is an example to help you through. If the case has two verticle RIBS ,from top to The Ford Axle code chart is a handy tool for positraction replacements. Ford improved tooth contact of the Ford 9 inch gears by locating its pinion gear lower on the ring gear. 6. First, you need to understand some fundamentals of the Ford axles to help guide your quest. Typically with just this information, you can cross reference what you need to know about the axle. 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The aftermarket Daytona-style pinion cartridge accommodates the larger and stronger pinion head bearing. . middle of case it is a good IRON type IF in the very center of this case Call us at (864) 843-9275. Notice the 8.0-inch ring gear diameter cast into the rear cover below the fill plug. All the Galaxies I have seen from throughout the 1960s N-case. The Ford chart below contains a general decoder system for Ford pickup from the 1980s till the 1990s. It features the legendary Ford 9-inch ring and pinion strength, 5-on-5.5 lug pattern (same as older Jeep), a 65-inch width at the wheel mounting surfaces, large-bearing semi-floating axles, and many can be found with hefty 31-spline axleshafts. Real World Hagerty Collector Car Insurance Claim Experience, How To Be Prepared For A Dyno Session And Not Waste Your Money, Holey Goat Father/Son Texas Road Trip 5 Days, and 2000+ Miles, Are You Killing The Hot Rod Community? Select the Towing Guide for your vehicle's model year. This is a major advantage compared to other rear axle systems because disassembly is faster and more convenient. So dont be surprised that most of these axles leak from the welds. Why is the Ford 9in rear end the go to rear axle for street and strip builds for over 70 years? The threatening to harm employees or others), Lack of adequate text (e.g., symbols, emojis and random letters), Reviews on the product and not the customers Sales or Service experience. You bring the gumption. A strong 9" with a nodular diff and 31 spline axles is fairly comparable in strength to a stock Dana 60 rear end. These variations include different-size drum brakes, disc brakes, and wheel hub arrangements. Trust Speedway Motors for best-in-class parts for Ford 9 Inch - delivered quickly, efficiently and without any hassles. GM X-Body Nova Complete Rear End Packages. 4. We provide how-to and technical articles, vehicle and build features and examples, plus calculators and lookups that will help you get your ride from dream to driver. The ring and pinion are then accessed, also from the front, by removing another 10 bolts. Along with the many different brake and wheel end varieties, many different styles of axle shaft ends were manufactured. You are looking for a nodular iron case, with its telltale N cast into the front or inside wall. * Pro Gears are specifically designed for drag race only. (narrowest 9-inch housing), 1966-1977 Bronco 58 inches but has 5-on-5 1/2 inch We offer a guide to follow when selecting a new set of brake pads for your race or street car. actual car posi units, which were primarily 28-spline carriers, can be The How To Identify The Axle Ratio From The Axle Code, Step 1: Locate the Safety Compliance Certification Label, Step 2: Locate the Axle code column on the label, Step 3: Get the manufacturers axle code chart. (It was later used for pick-ups and Broncos.) the axle from around the 1957 model year right up until the early 1980s Most of Bolt-In 9 Inch Ford Rear Housing for 1967-72 GM Pickup Trucks, Speedway Centered Housing Ford 9 Inch Axle Kit, 58 Inch Width, Fabricated 9 In Ford Rear Axle w/ Posi Traction 3rd Member, 58 In, 9 Inch Ford Cut-to-Fit Axle with Bearing, Big Ford/New Style, Ford 9 Inch Gear-Style Posi Differential Third Members, Ford 9 Inch Bolt-On Rear Disc Brake Kit w/ E-Brake Caliper, Driven 04230 75W90 Limited Slip Gear Oil Change Kit, Ford 9 Inch, CarTech SA170 High-Perf. This is by far the most common axle used by restorers, hot rodders, customizers, and racers. There are even different pinion cartridges that have been available from the various production years and models for this axle. The information on the plate includes: The purpose of the axle code is to help identify the specifics of a particular vehicles rear-end axle. This was offered on the 1960 F-100 truck. in the backside middle and stronger tubes. differences, 28-spline car axle shafts are much more abundant than the And you can find the axle code charts on the internet from your manufacturer. 5.4L (including Lightning) and some 44 super cabs and higher GVWR models which were equipped with the heavier-duty 9.75-Inch rear axle. Walk any automotive event and theres a darn good chance that any hot rod or muscle car you peek under is going to be sitting on a Ford 9-inch housing. There is a very fundamental difference between Fords 8.8- and 9-inch axles. Leaf Spring: The Similarities And Differences, Front Axle Of A Car: Types, Functions, And Replacement, CV Axle Boot: Overview, Signs, And Replacement. I reference these axles based on the ring gear nominal outside diameter in inches. station wagons-cars with 351 and up engines received 9-inch units - as did The complete guide to master any grease gun, Battery vs. Starter vs. Alternator: How to jumpstart even the most stubborn of car. When narrowing a Ford 9 inch rear end, the first step is determining the overall length you need. 1973-1979 Ford Truck Rear Axle Codes. popular early swap being the 1957-1959 Ford for the 1965/1966 Mustang. There are a few exceptions that you will see in the Ford Axle code chart. them. You can use the social sharing buttons to the left, or copy and paste the website link: https://www.diyford.com/ford-axle-history-identification-ford-differentials/. The large bearing size was available with fi ve different brake drum widths. Here are the internal sides of the same three units. if not I have other 9" info archived I can post. The Ford 9-inch has a reputation as a durable axle that can transmit enormous torque, and this is rightfully deserved. Most of 1. The certification plate can be located on the lock face of the left door edge. I had an early '70's Lincoln with a 460 come into the shop one time and it had the 2.33:1 ratio in a 9 inch. There is a ton of aftermarket support for this axle (see Chapters 3 and 4 for more details). widths I keep in mind for Mustangs are the following: (often referred to as a "POSI") came to be a popular option and 100 x 4.12. For instance, if both the engine and transmission deliver up to 100 ft./lbs. These used what is referred to as a Remember to locate the Safety Standard Certification label on the left side door post as you open the door. 70's. Generally, aftermarket shafts have to be purchased with 3/8" fine thread, while the larger bearing use 11/16" Some have only one access hole for the backing plate bolts, while others have three. medianet_versionId = "3111299"; The It may not be a stock or original Ford 9 inch rear end, but it carries the originals dimensions and specs and for all intents and purposes they are still considered a Ford 9 inch. many half ton trucks continued to utilize the 9-inch (both 2 wheel & 4 61.25 inches, 1967-1971 Comets, Cougars, Fairlanes 59.25 inches, 1967-1973 medium and big block Mustangs and Cougars, 1966-1971 Fairlanes, Torinos, Montegos, Comets, and other truck housings received even beefier center carrier housings and tubes, . The Using this data, hopefully you can decide whether you want a 2.73, 3.08, 3.27, 3.55, 3.73, 4.10, or some other gear in your car. Locate the Safety Compliance Certification Label on the driver's side front or rear door panel. common carrier housing found is the C7AW-E. Ford 9 inch rear end identification is easy and can be accomplished with nothing more than a deep socket as a go-no-go gauge for the bottom two retaining nuts on the center section. On this particular third member, the original copper washers that were under the factory fasteners have been discarded as well. You will need to look at the Ford axle code chart to replace your Ford rear-end axle parts. Ford Axle codes help identify the vehicles positraction as well as an axle to gear ratio. Aftermarket vendors are actually re-casting these cases in very strong nodular iron, so more often than not it is easiest just to purchase a new case. and trucks throughout the 1970s. It has more ground clearance than a Dana 60. On some tags, the first 2 digits don't appear on the tag, but they must be used to identify the axle. Generally most cars received the small axle bearings and 28-spline axle Home / Performance Front & Rearends / Parts Department / Ring & Pinion Sets / 9-Inch Ford. The first number is the last digit of the model year of the decade, the next digit is a letter and represents the month (A is for January, B is for February, and so on), and the last two digits represent the day of the month. Ironically, 8.0-inch independent carriers were made in cast iron. Strange Engineerings heavy-duty lines of S-Series transmission and pinion yokes were designed by Strange and are manufactured from USA made high tensile strength nodular iron castings. Many aftermarket companies produce 9 Ford equivalent rear axles for the drag racing and hot rod industry. 800-646-6718. The Fora platform includes forum software by XenForo. Watch the video for all the details and you'll wonder why your shop hasn't had a set sooner! In this video I break down in great detail the speed at which your car will be going for every 500 engine RPM with each typical rear gear ratio for each gear. See all 20 photos. Required fields are marked *if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'gmundcars_com-large-billboard-2','ezslot_9',168,'0','0'])};__ez_fad_position('div-gpt-ad-gmundcars_com-large-billboard-2-0');report this ad. Besides the styling of the Ford Edsel, even the axle shafts were very unusual. In this video I break down in great detail the speed at which your car will be going for every 500 engine RPM with each typical rear gear ratio for each gear of the transmission and then reverse it to show engine RPM for every 10mph and each transmission gear. There are 8.5-inch gears installed in these housings for lowerpower vehicle applications. A Refer to the Axle Ratio table to determine your rear axle ratio and Limited Slip. The Ford 9-inch can be found under 1974-1986 F-150s and 1978-1986 Broncos. The axle was developed to replace the Ford 9-inch axle.This axle is still in production today for a variety of Ford vehicles. Now you can see the C4AW-4025-B part number on the lower left unit, which verifies it as a nodular unit. It's uncertain if this E This is because the supply is limited to allow larger ring gear to fit. This is a sampling of some of them. station wagons-cars with 351 and up engines received 9-inch units - as did socket size and 7/16" fine thread. Buyers Guide. Many companies, such as Currie Enterprises, Mark Williams Enterprises, Moser Engineering,and Strange Engineering, reproduce this design today. Repairing a twisted brake or throttle cable with a simple homemade tool in just minutes Easy and functional. Therefore, these axle assemblies require better quality oil and good underbody airflow to keep the unit cool. 31-spline car shafts. The desirable N-style, nodular-iron gear cases are available in four different versions. more plentiful starting in the early 1970's, many of the units found today Keep in The 7.5" rear end is also flat on top and bottom. This axle tag belongs to a 1977 F-150. Any of the W-series cases do have a fill plug machined in them. It is still used in NASCAR racing as well. This combined with easy assembly makes it popular for fine-tuning a rear gear for any particular application. 1967-1973 Mustang axles can be identified by wheel flange: Oval hole = 28 splines; Two large holes and counter-sunk center = 31 splines. A simple formula to calculate Gear Ratio or Axle Ratios. These axles did have metal axle tags similar to the 9-inch axles but they were slowly phased out as vehicle programs were updated. About 8 months ago, I came across someone who had a very complete model, ratio chart for 9 in rears, After a computer crash, I have lost it. For a better experience, please enable JavaScript in your browser before proceeding. common carrier housing found is the C7AW-E. There are three versions with external Ns cast in; note the more curved style on the top right. Differentials, Axles/Drivelines, Book, Using GoJak Wheel Dollies to Easily Move Your Vehicle, Brake Pad Identification and Friction Surface Options Explained, Adapting Tremec's Popular T5 5-speed Manual to Ford's Flathead V8 Engine, Ford And Chevy Spindle Options For Solid Axle Hot Rods, Small Block and Big Block Chevy Engine Flexplate Guide. 13 lovely chevy 10 bolt rear end gear ratio chart. The original applications are as follows: 1. At this width, many were used in street rod applications without modifi cation. So rare Ford dropped it after 66, when they also dropped the 7" Equalock. earlier housings used in cars from 1957 to mid 1960s tended to be the duty.And believe it or not, they were also used in some FE equipped Ford A This will ensure that the correct replacement parts are purchased or salvaged from a junkyard to be used in the vehicle. inch diameter all the way to the backing plate, coil housings have upper 67-70 Mustang = 59.25 inches. Here is a picture of the milling machine cutting new spline teeth after the axle has been cut to length. It allows for the pinion side Center Section to be removed. inches to the housing, the small bearing housings use 9/16" socket size nuts The heat treated aluminum alloy well suited to absorb high impact shock loads. wheel drives) right up until about 1982, these housings are by far the 8300 N. Austin Ave Morton Grove, IL 60053 One exception to this was The Ford 8.8-inch is very similar to the General Motors (GM) 878-inch, 12-bolt axle. . FMX, three-speed, automatic. replaced, and that is why it remained in use for so long. This allows quick gear ratio changes to accommodate different tracks or updates to your vehicles horsepower and torque ratings. The bottom line begins with the ratio being the first set of numbers. The date code is stamped on the tag. 8. It is the one most commonly Many racers carry an extra carrier assembly for their 9 inch third member with a different rear end ratio so they can try different combinations on the same day while at the track. Projector vs. Reflector: Plan to upgrade your headlights? with 3/8" fine thread, while the larger bearing use 11/16" There are quite a few companies making Ford 9-inch housings to fi t just about any muscle car out there, including non- Ford vehicles. In this chapter I share a summary of decades of work on these axles. In contrast, on the 9-inch, two nuts on the bottom at about the 6 and 7 oclock positions cannot be accessed with a socket and require a wrench. socket size and 7/16" fine thread. To determine the axle ratioof your vehicle, locate thetwo-digitaxle code first, then use your vehicle'stowing guide to find the axle ratio that corresponds to that code. Torsion Axle Vs. Axle code is a combination of letters and numbers stamped on a small plate/tag attached to your vehicles rear axle. Boss 429s, 427s, 428 CJ/SCJ and the 429 cars which received the Since 2011, V6 and V8 Mustangs have used Ford's 8.8" rear end, but before that many used a 7.5" rear. Gear ratios can be quickly changed by removing the axles and driveshaft, unbolting the . CLICK HERE to see a complete listing of front axle codes). Ford Also Equipped The 1980-Current E-350 Dual Rear Wheel And Some E-450 Super Duty Vans With Dana 70 or Dana 70HD Rear Axles. Dont be surprised if the tag you have does not exactly match this. You can find the axle code on the Safety Standard Certification label information. axleshafts. Now that you have identified the axle code, let us know the axle ratio. carriers, while sometime in the early 70's the switch was made to mostly This chart references the connection between the month codes and the actual month. "Pro" gears are designed specifically for drag racing. There is a huge aftermarket support for this axle design. (final drop). duty.And believe it or not, they were also used in some FE equipped Ford The transmission yokes are CNC machined to assure concentricity and balance for ideal driveshaft operation. Your email address will not be published. The Ford 8.8-inch axle has the same ring gear mounting distance (see Chapter 7) for all ratios, just like the 9-inch. The Because of their strength, youll see these 9 inch rear ends used in just about every make of car, truck, and customs. It was also used in the 1983-1996 full-size Bronco, and E150 Econoline . The Godfather of Performance Axles-The Venerable Ford 9-Inch, Ford 9-Inch Axle And Bearing Retainer Retains The Axle In Case of Breakage, Checking A Ford Axle With a Deep Socket To Confirm If It Is a 8-Inch or 9-Inch, Ford 9-Inch Rear End Axle Flange Identification, Measuring a Ford 9-Inch Axle Housing and Axle Lengths. 54" The Final Drive Ratio shows you how many times the engine turns for one complete turn of the tires. This bearing is one of the reasons that the 9-inch has the reputation for being bulletproof. How do I find the Axle Ratio and Limited Slip? nickel content and better casting than the earlier single ribbed cases it Axle GM Chevy S10 82-04 Complete 9" Rear End Package. The magnesium addition causes the grain structure to change from flakes to nodules and thus the name nodular iron. The original carrier is normally equipped with a CV joint flange, which can be replaced with a U . If you need the Rear Axle Ratio for a vehicle produced before 2008, contact ourCustomer Relationship Center via Chat or call us at 800-392-3673. Vintage 1980 Yamaha Enticer Snowmobile Revival to Former Glory. The Ford 9 inch housing is a semi-floating, drop-out axle. the Broncos from 1966 to 1977, they stayed with the 28-spline units. but the link i was refering to listed codes by year and model. There may be a second dash and more numbers and letters on the top row if there are specifics that are unique for interchange information. Note: Rear axle ratios are available for 2008 and newer models. When you look on the inside, you see WAB- 4025A. GM G-body 78-87 Complete 9" Rear End Package. Ray. Here is an example of such a unit. pattern in most cases differed from the car, and due to the bearing size Spring perches must be cut and re-welded in order The fourth version did not have the N in the casting on the outside but still retained the rib structure. The 10,41 gear ratio is also great for off-road activities . These have a C4AW-4025-B casting part number next to the adjuster nut. Learn more. Variations Like the H in our case shows a car with a limited-slip differential. Check it out. GM Truck Complete Rear End Packages. control arm mount. The Daytona- style cartridge allows for a larger pinion head bearing when compared to the standard pinion cartridge. How can one verify "Posi" without taking the differential apart? Mustangs and Fairlanes. The material and heat treating provide excellent wear service life, but doesn't handle shock loads as well as Pro 9 in gears. Mustangs Like the H in our case shows a car with a limited-slip differential. same width, but the distance between spring perches is different between This pinion shows excessive wear on the trunnion surface and should not be re-used. Gross Vehicle Weight ( GVW ) would Ford 9 Inch Rear End Gear Ratios Chart1969 impala ss 427 4 speed. them. always looking for good content to share with in cars and trucks. The additional straddle mount pocket bearing provides additional support to the pinion head during high-torque events. The code, 4L11, tells us that it is a 4.11:1 ratio with a limited-slip or Traction-Lok differential. It is a column with the label AXLE on top and the Axle Code at the bottom. is by far the most abundant case being used in both full size Ford cars Interestingly, the Ford axle uses the exact same size of tapered roller bearings as the GM 12-bolt. The third member supports all of the gears and bearings, which allows for easier gear ratio swaps if you have multiple third members. 70's. Gears / Diffs / Install Kits Listed By Vehicle, Standard Gears & Pro Gears Dana / Ford / GM / Mopar, Strange T-Shirts. The A forum community dedicated to Ford performance owners and enthusiasts. Axle length is not always identical from side to side, as many 9-inch applications use an offset center, so you must measure the housing carefully to be able to order the proper axles. Ford improved tooth contact of the Ford 9 inch gears by locating its pinion gear lower on the ring gear. 1958-1959 two dimples on the back of housing, flat center band, some had drain holes. There was a desire to have the stronger, larger tubes near the center of the axle but still retain the narrower tube ends for the wheel ends and the unique Shelby suspension brackets. By positraction, we talk about the type of differential the car uses, whether a limited-slip differential or a conventional non-Positraction differential. Get any 3 for $25 plus shipping. 8.75, 9.25, Ford 9 inch, and GM's 8.25 inch . bearings, 28 and 31 splines, 57-68 passenger car and 1/2 ton truck - medium duty, stronger than Mustang Generally most cars received the small axle bearings and 28-spline axle With its 2.250-inch offset, the Ford 9 inch gears hypoid distance is greater than popular competitors, most of which are at 1.5 inches or even less. The Ford Mustang and Thunderbird used this style for a few model years. While the larger offset makes the ring and pinion gears stronger, the additional sliding of the gear teeth creates more heat in the axle. for the swap to be performed. dimples. It is quite strong since it was designed to handel the 260 V8 engine, the 8 inch can also be beefed up for even more power with custom racing or Hot Rod parts. Both standard and W-series cases are made out of gray cast iron. Exceptions to this were the ultra Hi performance Boss 302s, Using the correct part is imperative to engine longevity and proper drivetrain assembly. If there is an "L" in between, you should have a locking or limited slip differential. The first table is the code and gear ratio. This is not a nodular unit. 1967-1973 Mustang axles identified by wheel flange: two large holes and counter sunk center - 31 splines. The Ford 9 inch rear end also has the widest variety of ratios on the market, Particularly in the 3.0:1 to 5.0:1 range. If the socket fits (as shown in our photo below) it is a Ford 8-inch housing. Ford Differential Axle Codes. Rhodes Race Cars Unwelded Fabricated Rear End Housing Ford 9 in. It also has a 9-inch ring gear. Original gear ratios range between 2.79:1 and 5.43:1, and aftermarket replacement gears are available for many ratios as well. Dive into some of the history and unique differences between Ford and Chevy spindles for solid front axles and what will perform best on your hot rod. If you are looking for an N case or think that you have found one of these desirable axles, make certain to examine it closely. and 429CJ cars.From what I have seen don't expect to find them in 390 or the best. It has been said that it has a higher Of course, if your budget allows, you can purchase an aftermarket iron case that is stronger than any factory case. Over several generations of small block Chevy (and big block Chevy) engines there have been several changes that dictate what flexplate works with them. Our experts will help you find the correct ring and pinion set for your particular application. So again, unlike the GM and Dana axles that require a unique differential with different ratios, the Ford 8.8-inch differential is common across all of the ring-and-pinion ratios. Note: Rear axle ratios are available for 2008 and newer models. In order to verify a nodular unit, you need to look on the inside of the casting. housings. thanks. only need to carry one spare should you choose to. I have a '50 Club Coupe and have experienced this first hand. if one wants to use a 31-spline truck carrier in a car. of torque to the pinion gear and the gear ratio of the ring-and-pinion is say 4.12:1, the output torque is 412 ft./lbs. Well help you determine the correct flexplate for your Chevy engine in this buyers guide. Also note there isn't a cover on the rear like most axles. There are several reasons for this. version of the case came into use in 1967 or in subsequent years, but it If the socket fits (as shown in our photo below) it is a Ford 8-inch housing. Use this information at your own risk. If your vehicle has a Limited Slip Differential, it will be noted as Limited Slip. If the axle tag is missing, as most are, you need to remove the third member in order to know what ratio you have and if it has a limited-slip or not. most abundant. The date code on this axle tag is 7AC, and it corresponds to the 7th year, 1st month (January), and 3rd day. You will also learn how to identify the codes in Ford vehicles. It was then replaced by the Ford 8.8 inch rear axle. Dana 50 - Ford Front Dana 60 - Standard or Reverse Rotation Ring Gear Diameter: 9" / 229mm Ring Gear Diameter: 9.75" / 248mm Pinion Diameter / Spline: 1.375" / 26 Pinion Diameter / Spline: 1.625" / 29 Ring Gear Bolts: (10) 7/16"x20 RH Ring Gear Bolts: (12) 1/2"x18 RH Cover Bolts: 10 Cover Bolts: 10 Carrier Breaks: None Carrier Breaks: 4.10 / 4.56 I'm not responsible for incorrect information, Width: all measurements are flange to flange, Ford Rear Axle Assembly Identification - Page 01 - FORDification.com.