ford 9 inch rear end gear ratios chart

These axles did have metal axle tags similar to the 9-inch axles but they were slowly phased out as vehicle programs were updated. The fundamental difference between these axles is how the gears are supported and which end of the axle housing (front or back) that they are assembled from. It has been said that it has a higher You Note the two lower bolts at 6 and 7 oclock have straight access with a socket. But to be correct, it is a 3/4 fl oat. Measuring from the outside of the axle flange to the centerline of the pinion gear/nut will give you the correct axle length required (B and C measurements below). for 1967-1970 (same as 1966-1969 Fairlane, Torino, Comet & Cyclone non 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. Ford 8 Ford 9: CLICK FOR MORE INFO. i.e. We stand behind our products with some of the smartest technicians in the industry. 67-71 Comet, Cougar, Mustang, Fairlane = 59.25 inches. The 8.5- and 8.8-inch gears have even found themselves in the independent-carrier-style axles. mind as mentioned, the Fairlane spring perch distances were not the same Our example is going to assume a 6000 rpm redline and 26-inch-diameter tires. * Coupon does not apply to Oval Size Matters T-Shirt. This will ensure that the correct replacement parts are purchased or salvaged from a junkyard to be used in the vehicle. 76-77 large bearing. When it comes down to actual shafts as well, since the truck lug in cars and trucks. 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. popular early swap being the 1957-1959 Ford for the 1965/1966 Mustang. Ford Rear Axle Assembly Identification - Page 01 . The case Comet that has had a HIPO SMALL block with 31-splines and a locker. Are reviews modified or monitored before being published? These tags are typically quite beat up, twisted, and rusted over the years. On this particular third member, the original copper washers that were under the factory fasteners have been discarded as well. (often referred to as a "POSI") came to be a popular option and 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. 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. The 1966 Mustang had 14 possible rear gear ratio/differential combinations. much more difficult to locate. 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/. 1967-1973 Mustang axles can be identified by wheel flange: Oval hole = 28 splines; Two large holes and counter-sunk center = 31 splines. The date code on this axle tag is 7AC, and it corresponds to the 7th year, 1st month (January), and 3rd day. widths I keep in mind for Mustangs are the following: It is common to find a 9-inch in a old Falcon or Centers: 1957 - no dimples, flat center band up the center of the rear cover, bottom drain plug, 1958-1959 - two dimples on back of housing, flat center band, some had drain holes, 1960-1967 - two dimples, flat center band, oil level hole in back cover, 1963-1977 Lincoln, LTD, Thunderbirds had 9.375 inch centers, housings were cut away at the gasket surface for ring gear clearance, one curved rib at the front top portion of differential, strong but no gears, 28-spline axles cannot be shortened and resplined (they're tapered), 1972 and earlier 31-spline axles have the ability to be shortened, 1973 and later version of the case came into use in 1967 or in subsequent years, but it The Daytona- style cartridge allows for a larger pinion head bearing when compared to the standard pinion cartridge. medianet_width = "300"; Like the 9-inch, the 8-inch uses no carrier breaks, meaning you can put a 5.43:1 ring and pinion in a 2.79:1 rear without changing to a smaller differential carrier. I have also spent many hours in scrap yards and visiting and interviewing the experts in this field along with years of building numerous axles myself. large-bearing semi-floating axles, and many can be found with hefty 31-spline 289 Hipo cars.The N cases went with 31 spline centers and are for rugged Find the word AXLE under the bar code. 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. The housings also evolved over the years: The This is because the supply is limited to The BOM will identify the model number, the gear ratio, the type of differential, and all component parts. Most of Ford personnel and/or dealership personnel cannot modify or remove reviews. When you buy through our links, we may get a commission. Determining the correct flexplate for your V8 Mopar-powered project takes a little understanding of how these engines were balanced. The transmission yokes are CNC machined to assure concentricity and balance for ideal driveshaft operation. common carrier housing found is the C7AW-E. 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This combined with easy assembly makes it popular for fine-tuning a rear gear for any particular application. 31-spline axles and carriers for most trucks. There is typically a stamped steel cover that must be removed to gain access to the internals. the Broncos from 1966 to 1977, they stayed with the 28-spline units. What Is Car Battery Voltage And Why Is It Important? Now that you have identified the axle code, let us know the axle ratio. Have The very rare optional 6 cylinder rear was the 3.50. We will look at what axle codes are and how to identify the axle ratio from the code. Mustangs and Fairlanes. Performance Front & Rearends GM Vehicles The third member supports all of the gears and bearings, which allows for easier gear ratio swaps if you have multiple third members. The ring and pinion are then accessed, also from the front, by removing another 10 bolts. Start by opening the left drivers front door. The 7.5 should be plenty adequate for the application you describe, but an 8.8 is best. The later and trucks throughout the 1970s. 4. Theres an easy way to tell an 8-inch apart from a 9-inch. It has enjoyed a long production history with many variants. The 9-inchs very large pinion offset of 2.25 inches requires the pinion to be straddle mounted, which refers to the fact the pinion head has bearings that straddle it on either side. The Ford 9 inch rear end is one of the most popular axles in automotive history. other Ford Ranger enthusiasts. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. The engines flexplate is a critical part to transferring power to your drivetrain. 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. . smooth backside. The following chart of Tire sizes and axle gear ratios are meant to give a general idea of the relationship between the differential gear ratio and the tire size and what effect the ratio has on power output and fuel economy. The material and heat treating provide excellent wear service life, but doesn't handle shock loads as well as Pro 9 in gears. 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. Refer to the Axle Ratio table to determine your rear axle ratio and Limited Slip. A 2-inch version is not shown. mind as mentioned, the Fairlane spring perch distances were not the same The Ford 8.8-inch axle has a cast center section and the internal components are installed from the rear. The Ford 9 inch rear end is one of the most popular axles in automotive history. Call 800.979.0122, 7am-10pm, everyday. replaced, and that is why it remained in use for so long. Here is an example of such a unit. Ford intermediates with big blocks. (CROSS SECTION WIDTH x 0.ASPECT RATIO x 2 25.4) + WHEEL DIAMETER = OVERALL TIRE DIAMETER. Check it out. There are even different pinion cartridges that have been available from the various production years and models for this axle. It was in production on many Ford cars and trucks, first appearing in 1957 and finally replaced by the Salisbury-style 8.8-inch axle in 1986, saving about 50 pounds and boasting increased efficiency. The 8-inch was introduced in 1962 and is found in many lower performance Fairlanes, Mustangs, Falcons, Comets, Cougars, and Pintos, just to name a few of the applications. carriers, while sometime in the early 70's the switch was made to mostly The Ford 9-inch is the most desirable drag racing rear end because it has a removable carrier, which allows quick rear end changes. If the case has two verticle RIBS ,from top to smooth backside. 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. carriers both, as well as with the spline count on the axle shafts. many half ton trucks continued to utilize the 9-inch (both 2 wheel & 4 Enter the required Overall Width, Pinion Offset (location), Brake Space and Drum/Rotor thickness to find axle length and housing width. A Variations The case Hypoid offset is the distance between the centerline of the pinion and the centerline of the ring gear. With their high-volume production, the two biggest quality problems were leaks from poor welds and poor alignment of the housings. Using the Ford Axle code chart, you will get to negate all these issues with ease. Our Mopar flexplate buyers guide will help. It was then replaced by the Ford 8.8 inch rear axle. The rear-end housing has a vast amount of ford 9-inch gear ratios available. Ford Axle codes help identify the vehicles positraction as well as an axle to gear ratio. - as in the Mustang line, most however never received a factory 9-inch). if not I have other 9" info archived I can post. station wagons-cars with 351 and up engines received 9-inch units - as did There are four versions of the nodular iron third members that were produced from the factory. Ford cars and trucks from 1968 on have an axle code on the Certification Plate, information on this plate can be used to determine if you vehicle is factory equipped with a limited slip positraction rear end - differential. Ranger These used what is referred to as a These tags were not that informativeon the early units, so from 1957 to 1962 the tag just referenced axle ratio. Cost and complexity are two. If you are building a 9-inch Ford rear end for your project know you have plenty of options in gear ratios, axles, bearings, brake kits, and much more! by the size of the nuts and thread used to retain the brake backing plates These third members are the strongest of the production cases and the most desired. There were also 8-inch ring gear independent carriers in production. This is a great upgrade component to use for high-power applications or if you are replacing your cartridge. The large 9-inch diameter ring gear (where the axle derives its name from), combined with its offset to the pinion gear makes for a larger ring and pinion contact surface area, increasing strength. Ford used Dec 1, 2011. Note that most, but not all, applications will usually have one axle longer than the other due to an offset center section, so don't just measure one side and assume the other is the same. The tubes do not have any welds, and you just see the witness marks of the parting line for the dies on the tubes. Since the "Limited slip" or Locking rear end Our aluminum cases are manufactured from premium material sourced in the USA, designed and machined in-house, and offered in various forms to meet the requirements of the most demanding applications. tubes with flat tops, 1969-1977 Galaxies (coils), Lincolns (coils), and late pickups (leaf)- 3.25 The image below shows the Safety Label of a Ford Truck. This is an example of the only Ford 9-inch version that utilized one-piece tubes. trucks varied more, early half ton trucks got the 28-spline axles and 13 lovely chevy 10 bolt rear end gear ratio chart. the best. Chevy differentials: how to rebuild the 10- and 12 . Ford 9-inch can be found under 1974-1986 F-150s and 1978-1986 Broncos. 70's. N-case. 289 Hipo cars.The N cases went with 31 spline centers and are for rugged Notice that the date code is C9UA with the ring gear size of 8.7. If you know your axle tag number, simply go to the second table. The rear end width is important on shoebox Fords if you want some selection on wheels. Now you can see the C4AW-4025-B part number on the lower left unit, which verifies it as a nodular unit. It can also help in identifying the axle ratio of your particular vehicle. Vintage 1980 Yamaha Enticer Snowmobile Revival to Former Glory. housings. As part of my research, I went to renowned Currie Enterprises and gathered one of just about every different 9-inch axle variant. determine which axle housing many cars and trucks received. the early housings are ok for the average street performance cars. Ford codes may have one or two characters, but any code starts with a letter. Differential Gear Ratio Calculator. The Ford 8.8-inch is very similar to the General Motors (GM) 878-inch, 12-bolt axle. These variations include different-size drum brakes, disc brakes, and wheel hub arrangements. pattern (same as older Jeep), a 65-inch width at the wheel mounting surfaces, The middle number is the ring gear diameter in inches, typically an 8 or 9. It is as easy to cut down as any other 8 or 9 inch Ford axel. Typically with just this information, you can cross reference what you need to know about the axle. Like the H in our case shows a car with a limited-slip differential. With 568 Ford 9 Inch Parts for sale, you're sure to find the ideal parts . 2. the axle from around the 1957 model year right up until the early 1980s This was an 8.75- inch ring gear in a 9-inch housing. The If measuring the drum-to-drum distance, add .200-inch to these values. Some of this information is very important as it is becoming more and more difficult to find documentation on axles and differentials that were built more than 40 years ago. Both standard and W-series cases are made out of gray cast iron. 800-646-6718. 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. The unit on the top left seems to be nodular iron but requires a little more investigation to verify. some 302 4V cars with optional gear ratios). Front Axle Codes While the parts catalog says "The third digit of the axle code identifies the ratio and/or capacity of the front axle", that is not true.As seen below, there are only 4 codes (2 - 5) and they do not define the axle ratio nor capacity.In fact, to find the front axle ratio you need the codes off the axle itself, as shown here: 1/2 ton 4X4 pickups! Warranty Period: 1 Year or 50,000 Miles: Part #: MGK-300 : Ring Gear Diameter: 8.5 Front (Inch) 9 Rear (Inch) Ring Gear Material: 8620 Steel: Differential . All the Galaxies I have seen from throughout the 1960s It was not the only axle used, but was by far one of Another bonus is that the axleshafts are of equal length, so youll for 1965-1966 (the same width as 1964-1965 Falcons and 1962-1965 Fairlanes Many companies, such as Currie Enterprises, Mark Williams Enterprises, Moser Engineering,and Strange Engineering, reproduce this design today. Axle Size/Strength Chart; Explained Videos; Tech Articles; 9-Inch Ford. You can find the axle code on the Safety Standard Certification label information. "N For a better experience, please enable JavaScript in your browser before proceeding. In the 1980s and 1990s, the Lincoln Versailles brakes and complete axles were highly sought after because it was the only way to get a 9-inch axle with discs in a 58-inchwide axle package. Tip: To search the Towing Guide, press CTRL + F to open a search box in your . The "rough" 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! JavaScript is disabled. version of the case came into use in 1967 or in subsequent years, but it (narrowest 9-inch housing), 1966-1977 Bronco 58 inches but has 5-on-5 1/2 inch Since 2011, V6 and V8 Mustangs have used Ford's 8.8" rear end, but before that many used a 7.5" rear. We can teach you some of the major differences between the Ford and GM-style T5 Flathead transmission adapter kits. Talk to the experts. 2. Ford 9 Inch Rear End Gear Ratios Chart1969 impala ss 427 4 speed. Original gear ratios range between 2.79:1 and 5.43:1, and aftermarket replacement gears are available for many ratios as well. 1957 . also received the larger axle bearings housings. Axle by the size of the nuts and thread used to retain the brake backing plates There are even different drum brake registers. We'll also walk you through choosing the correct parts in order to make this installation a breeze! Axle code is a combination of letters and numbers stamped on a small plate/tag attached to your vehicles rear axle. No Brake Fluid Coming Out When Bleeding: The Causes and How to Fix, 15 PENSKE Truck Warning Lights: Video Included, Manufacture date of the particular car model (DATE). In this chapter I share a summary of decades of work on these axles. For a Ford 9 inch rear end, swapping gears is fairly easy as it has a removable third member. Select the Towing Guide for your vehicle's model year. 56" Ford Aerostar: The 8.8-Inch axle . diameter bolt circle, 1967-1973 Torinos, Rancheros, Fairlanes 59.25 inches or The third reason was basic health and safety concerns for the assembly technicians and other employees who handled the axles in the manufacturing and assembly plants. We offer a guide to follow when selecting a new set of brake pads for your race or street car. small bearing housing can be differentiated from a large bearing housing The larger offset is better for strength and noise but worse for sliding and efficiency. 74-75 medium duty large bearing, and. For reference, this section from the Ford MPC is posted . It is still used in NASCAR racing as well. These used what is referred to as a The Lincoln LS and Jaguar S-type were equipped with an 8-inch, castaluminum, independent- style carrier. GM A-Body Complete 9" Rear End Packages. The date code is stamped on the tag. The complete guide to master any grease gun, Battery vs. Starter vs. Alternator: How to jumpstart even the most stubborn of car. Identifying a differential hinges the ability to distinguish the two primary rear-end types---the 8- or 9-inch rear end---denoting ring-gear size. The chart is based on RPM levels at 65 mph (105 kph) and a drive train running at a 1:1 gearing ratio, meaning the . For the Ford 9" rear end to be smaller and lighter than a Dana 60, the weight has to come from somewhere. Remember this is the RPM based on no slippage at the torque converter so your actual RPM will be different during acceleration or times when the torque converter is slipping.3.55 gear: https://amzn.to/2HMrffx3.73 gear: https://amzn.to/2r0MakF4.10 gear: https://amzn.to/2JouvuH#wjhandydad #crownvic #reargear #gearratio #DIYhttp://www.WJHandyDad.comDisclaimer:Due to factors beyond the control of WJ Handy Dad, I cannot guarantee against improper use or unauthorized modifications of this information. 31-spline carriers and axle shafts. GM G-body 78-87 Complete 9" Rear End Package. Filed Under: Ford Tech Tips, Rebuild Ford Differentials, The Best Ford Tech Articles, 2023 DiY Ford. Well help you determine the correct flexplate for your Chevy engine in this buyers guide. It's . 31-spline car shafts. The original carrier is normally equipped with a CV joint flange, which can be replaced with a U . them. Why is the Ford 9in rear end the go to rear axle for street and strip builds for over 70 years? in cars and trucks. These axles even have a unique bolt pattern of five on 5 inches. 66-75 large bearing, 3. and Fairlane axle housings are often grouped together because they are the How To Recognize 9-Inch Housing The original applications are as follows: 1. CLICK HERE to see a complete listing of front axle codes). It is a banjo-style axle as is the 8-inch. Width: all measurements are flange to flange. No. It has more ground clearance than a Dana 60. A simple formula to calculate Gear Ratio or Axle Ratios. This is a typical axle tag that has been removed from the third member. Roadkill Customs has evolved from local hot rod shop to online how-to magazine for budget-minded do-it-yourself hot rod builders and enthusiasts. Gross Vehicle Weight ( GVW ) would The first two digits of the axle code identify the ratio and capacity of the rear axle. Power is transmitted from the transmission to rear end 1:1 in high gear. But if youre looking for an original, they can be spotted quite readily even without an axle identifycation tag. much more difficult to locate. 31-spline car shafts. This strengthens the whole rear end assembly. The 9-inch housing's center section will not allow the socket to clear, and . The last set of digits on the top row on the right side is the date code. While the 1350 u-joints provide enough strength to handle most demanding of applications, Strange also offers a variety of yokes with1480 u-joints for the ultimate in driveline strength and dependability. . (The third digit of the axle code identifies the ratio and/or capacity of the front axle, if applicable. Boss 429s, 427s, 428 CJ/SCJ and the 429 cars which received the is the strongest factory case made BY FORD!!! How to Narrow a 9 Inch Ford Rear End. 1967-1973 Mustang, Torino, Ranchero, Fairlane 9-inch 3. The axle housings themselves had many different variations over time as well. This is a sampling of some of them. 8.75, 9.25, Ford 9 inch, and GM's 8.25 inch . Rhodes Race Cars Unwelded Fabricated Rear End Housing Ford 9 in. Here is an example of 11 x 2-inch drums brakes with the small bearing size on the left and the large Torino style on the right. The 7.5" rear end is also flat on top and bottom. There were many instances of cuts and scratches from the thin steel tags sticking up on the axles. If you liked this article you will LOVE the full book. 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. some 302 4V cars with optional gear ratios). None of which changes the strength of the axle shaft. The Mustang Shelby GT housing is an easy one to spot, albeit rare, because it has extreme tapering of the axle tubes at the ends. . earlier housings used in cars from 1957 to mid 1960s tended to be the When it comes down to actual shafts as well, since the truck lug While the larger offset makes the ring and pinion gears stronger, the additional sliding of the gear teeth creates more heat in the axle. The desirable N-style, nodular-iron gear cases are available in four different versions. People have been climbing around scrap yards for years to find the best examples of the 9-inch axle. Paint gmc dupont charts reference chart 1956 1959. The axle code in our example, H9, has a specific meaning. narrowed rear ends due to the added strength in the middle. with 3/8" fine thread, while the larger bearing use 11/16" Drag Racing 101 ~ Everything You Need to Know! You are correct sir, these are the standard ratios for 65-66. 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. Like the H in our case shows a car with a limited-slip differential. Also, since this axle is used in so many circle-track race cars, the 9-inch enjoys an unparalleled availability of different gear ratios in the aftermarket. 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. Click on the 'Submit' button to find out how you Ford Differential Axle Codes. trucks varied more, early half ton trucks got the 28-spline axles and 31-spline carriers and "Traction Loc" style posi unit. Note the ring diameter cast into the housing above the pinion. So rare Ford dropped it after 66, when they also dropped the 7" Equalock. 9-inch complete rear axle is approximately 35 pounds heavier than an 8.8 rear axle with approximately the same components.

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