ford 9 inch rear end gear ratios chart

for the 1971-1973 Mustangs - cars with 351 engines and up receiving the 9-inch I have included the narrow 8-inch axles for reference. The Final Drive Ratio shows you how many times the engine turns for one complete turn of the tires. Many people are not aware that Ford made a smaller banjo axle and confuse the 8-inch for a 9-inch. A 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. also received the larger axle bearings housings. for the swap to be performed. Strange Engineerings superior line of Chrome Moly Transmission yokes are manufactured from high quality forgings and fully heat treated to achieve maximum tensile strength. The if one wants to use a 31-spline truck carrier in a car. But if youre looking for an original, they can be spotted quite readily even without an axle identifycation tag. 31-spline carriers and axle shafts. Application Ring Gear And Pinion NL or L Axle Shaft Splines Additional Information; Ratio: Diameter of RG: WBG-E : Ford Truck '63-71 F100: 3.70: 9 in: NL: 28-WBG-F : Ford Truck '63-71 F100: 3.89: 9 in . In 1963, Ford includedmore information. Chevy differentials: how to rebuild the 10- and 12 . station wagons-cars with 351 and up engines received 9-inch units - as did Here are the internal sides of the same three units. As you proceed to the Ford Axle Code chart, you will notice that the table indicates it has a Ford 8.8 Limited Slip Differential with an Axle Ratio of 3.55. Axle code. 1957 . Are reviews modified or monitored before being published? 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. for the swap to be performed. As part of my research, I went to renowned Currie Enterprises and gathered one of just about every different 9-inch axle variant. for the 1971-1973 Mustangs - cars with 351 engines and up receiving the 9-inch These tags provided information for the service technicians but wasnt that important for the vehicle assembly plants. large-bearing semi-floating axles, and many can be found with hefty 31-spline So, after crawling under just over 50 Cars, trucks etc at the local Upull, I found that a 1995 2wd 2.3 Ranger has the correct length driveshaft at 47.5".chevy truck driveshaft length chart. How do I find the Axle Ratio and Limited Slip? 1964-1971 Falcon, Comet, some 1965-1969 Mustangs or 1964-1967 Ranchero V8 cars. The Ford Explorer uses an independentstyle Carrier made out of cast aluminum. applications due to the demise of most performance engine options in the Leaf Spring: The Similarities And Differences. The BOM will identify the model number, the gear ratio, the type of differential, and all component parts. 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. There is a machined roller bearing race on the pinion head portion that points at the differential opposite thetapered bearing races. Axle Size/Strength Chart; Explained Videos; Tech Articles; 9-Inch Ford. With the pinion gear and differential in place, rear-end marking compound in place, and with the bearings only "snug" (just tight enough to eliminate any "play"), check the pinion depth by way of the contact pattern that can be found by the rotation of the pinion against the ring gear. Ford Axle code identification, Read more: Front Axle Of A Car: Types, Functions, And Replacement. inches The Ford 9 inch rear end is one of the most popular axles in automotive history. earlier housings used in cars from 1957 to mid 1960s tended to be the The larger offset is better for strength and noise but worse for sliding and efficiency. Ranger Station, Submit 2. Remember to locate the Safety Standard Certification label on the left side door post as you open the door. It was also used in the 1983-1996 full-size Bronco, and E150 Econoline . Cost and complexity are two. Spring perches must be cut and re-welded in order "N Case" was no longer needed for passenger car/truck The axle code in our example, H9, has a specific meaning. Ford non-overdrive transmissions include: C-4, three-speed, automatic. Most 1972 and earlier 31-tooth spline shafts can be shortened and 1973 and later versions typically cannot be resplined. This case looked like a nodular unit from the front regarding rib structure but did not have the N on it. Exceptions to this were the ultra Hi performance Boss 302s, The axle model codes are interchangeable, typically the suffixes are different for a revision change but the axle is still interchangeable with one having the previous suffix. Ford intermediates with big blocks. CLICK HERE to see a complete listing of front axle codes). These were used sporadically until about 1969. Give us a call at 800-216-1632 to get started. trucks varied more, early half ton trucks got the 28-spline axles and You bring the gumption. But the 9" is better in a couple respects: It's much lighter than a Dana 60. Our editors pick the products & services we write about. I guess this helps add to the splendor of the vehicle. popular early swap being the 1957-1959 Ford for the 1965/1966 Mustang. The "rough" middle of case it is a good IRON type IF in the very center of this case Most of . The bar code is present on this unit as well, although later axles just carry the bar code and the metal tag is no longer required. 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. Would very much apreciate it if someone would post it again. The answer lies in several of the Ford 9-inchs design aspects, starting with the Ford 9 inch gears. 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 . It has more ground clearance than a Dana 60. This pinion shows excessive wear on the trunnion surface and should not be re-used. All of the 8-inch case nuts can be accessed with a socket. These tags were not that informativeon the early units, so from 1957 to 1962 the tag just referenced axle ratio. This pinion has the tapered bearings and collapsible spacer in place. in the backside middle and stronger tubes. This custom axle tag was obviously hand cut as evidenced by the sharp tin-snipped-looking ends and includes DSO, for Dealer Special Order. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. I reference these axles based on the ring gear nominal outside diameter in inches. Ford used The original carrier is normally equipped with a CV joint flange, which can be replaced with a U . Performance Front & Rearends GM Vehicles There are three versions with external Ns cast in; note the more curved style on the top right. First, the pinion shaft housing is removed from the front of the housing by removing five bolts. 1972 and earlier, 31 spline axles have the ability to be shortened. diameter bolt circle, 1967-1973 Torinos, Rancheros, Fairlanes 59.25 inches or 31-spline axles and carriers for most trucks. The complete guide to master any grease gun, Battery vs. Starter vs. Alternator: How to jumpstart even the most stubborn of car. If the socket fits (as shown in our photo below) it is a Ford 8-inch housing. The ranger truck works good with a 9-inch from a and 429CJ cars.From what I have seen don't expect to find them in 390 or The narrowest production 9-inch axle is 56.375 inches. them. actual car posi units, which were primarily 28-spline carriers, can be This bearing is one of the reasons that the 9-inch has the reputation for being bulletproof. thanks. These axles did have metal axle tags similar to the 9-inch axles but they were slowly phased out as vehicle programs were updated. First locate your current gear ratio and tire diameter and then find your approximate RPM at 65 MPH, then reference your new tire diameter with your desired RPM to find the new gear ratio needed. some 302 4V cars with optional gear ratios). 54" One exception to this was 70's. same width, but the distance between spring perches is different between These variations include different-size drum brakes, disc brakes, and wheel hub arrangements. Where A=the first number (static reduction), Bi=Gear diameter, Bf=Ring Gear diameter, Cf= (Crown Wheel dia.) It was introduced in 1957 model year cars and ended production in 1986, having been phased out in favor of the Ford 8.8 inch axle.However, aftermarket companies still produce the 9-inch design. 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! The Ford 9-inch has a reputation as a durable axle that can transmit enormous torque, and this is rightfully deserved. It also has a 9-inch ring gear. Ford 8 Ford 9: CLICK FOR MORE INFO. for 1965-1966 (the same width as 1964-1965 Falcons and 1962-1965 Fairlanes This is an example of the only Ford 9-inch version that utilized one-piece tubes. The This is 2.25 inches for the Ford 9-inch and 1.5 inches for the 8.8-inch axle. The fourth version did not have the N in the casting on the outside but still retained the rib structure. Some of the 9-inch truck differentials will have an exaggerated hump on the rear cover to . It was not the only axle used, but was by far one of 4.09 Front, 4.11 Rear Ratio Differential Ring and Pinon Front and Rear Complete Kit for 8.5 Front (Inch), 9 Rear (Inch) (10 Front, Dropout Rear) . Using the correct part is imperative to engine longevity and proper drivetrain assembly. The magnesium addition causes the grain structure to change from flakes to nodules and thus the name nodular iron. Calculating the torque multiplication that your axle gears provide is quite easy. GM X-Body Nova Complete Rear End Packages. If you liked this article you will LOVE the full book. Rear ends with 3.42 gears usually come in 8.2 and 8.6-inch units, Rear ends with 3.73 gears come in 8.5 8.6-inch units Best Gear Ratio For Your GM 10 Bolt. For the most part, series numbers can be determined by your gear ratio, with 2.73 and lower rearend gear ratios falling in the 2-Series, 3.08 to 3.90 rearend gear ratios falling in the 3-Series, and 4.10 and higher rearend gear ratios falling in the 4-Series. This larger offset (hypoid distance) between ring-gear and pinion-gear centerlines is the key reason the Ford is inherently strongerbut also why its slightly less efficient. When you buy through our links, we may get a commission. medianet_height = "250"; Careful aftermarket shops and their stringent attention to repairing these housings are able to correct many of these issues. This will ensure that the correct replacement parts are purchased or salvaged from a junkyard to be used in the vehicle. Start by opening the left drivers front door. weakest and had abrupt ending but welded carrier centers to tubes and a If you don't know your gear ratio, you can calculate it by taking the number of rear . The most by the size of the nuts and thread used to retain the brake backing plates It is underneath one of the nuts that holds the third member in place. Read this first! These tags are typically quite beat up, twisted, and rusted over the years. The later It's important to know the friction quality and pad size before selecting a new set of disc brake pads. 2. The 9 Ford rear axle, so called because of a 9 ring gear diameter, is the choice of many circle track racers because of its strength, availability and ease of maintenance. Call us at (864) 843-9275. The Maverick 8" or Ranger 7.5 and 8.8 are good options. bearings, 28 and 31 splines, 57-68 passenger car and 1/2 ton truck - medium duty, stronger than Mustang * Pro Gears are specifically designed for drag race only. 7.5 inch, 8.5 inch, 10.5 inch. Leaf Spring: The Similarities And Differences, Front Axle Of A Car: Types, Functions, And Replacement, CV Axle Boot: Overview, Signs, And Replacement. Exceptions to this were the ultra Hi performance Boss 302s, The 7.5 should be plenty adequate for the application you describe, but an 8.8 is best. Select the Towing Guide for your vehicle's model year. in cars and trucks. in cars and trucks. GM B-Body Complete 9" Rear End Packages. axleshafts. It was not the only axle used, but was by far one of Ironically, 8.0-inch independent carriers were made in cast iron. Then take that answer and divide it by 100% and then multiply it by itself to find out what gears/axles you need to run to achieve the desired tire size. The Ford 8.8 is an automotive axle manufactured by Ford Motor Company at the Sterling Axle Plant in Sterling Heights, MI.It was first used in model year 1983 Ford trucks. most abundant. "N People tend to be drawn to it like a magnet. 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. The Ford 9 inch rear end is one of the most popular axles in automotive history. Ford Differential Axle Codes. 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. This chart references the connection between the month codes and the actual month. Due to factors beyond the control of WJ Handy Dad, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. 52" It's . Ford personnel and/or dealership personnel cannot modify or remove reviews. The typical 3 inch-diameter tubes can be a bit flimsy in higher-power applications. and Fairlane axle housings are often grouped together because they are the of course most desirable is the N case, first used on the 427 Galaxies The code, 4L11, tells us that it is a 4.11:1 ratio with a limited-slip or Traction-Lok differential. Info To Share? 1/2 ton 4X4 pickups! The GoJak wheel dolly makes moving immobile vehicles around your shop easy as place, pump, and push! One of the primary reasons why the 9" Ford rear end has come to dominate drag racing is the ease with which thirdmembers with various ring & pinion gear ratios can be installed. 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. This is by far the most common axle used by restorers, hot rodders, customizers, and racers. There is a gear ratio stamped on the tag. medianet_versionId = "3111299"; The There are even different drum brake registers. 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/. by the size of the nuts and thread used to retain the brake backing plates When narrowing a Ford 9 inch rear end, the first step is determining the overall length you need. Here is a down-and-dirty way of picking the best gearing for a particular car from three choices: 3.07:1 final drive with a wide-ratio transmission, a 3.07:1 final drive with a close-ratio transmission, and a 3.36:1 final drive with a close-ratio transmission. The date code on this axle tag is 7AC, and it corresponds to the 7th year, 1st month (January), and 3rd day. $(document).ready( function () {$('#dtTable').DataTable( {paginate: false} );} ); 1954 Ford F100 / 2000 Lincoln Towncar Chassis Swap for Under $1,000, Tire Width Minimum, Maximum, and Ideal Size Chart by Wheel Width, An Online Magazine for DIY Hot Rod Builders. The unit on the top left seems to be nodular iron but requires a little more investigation to verify. You can do this by multiplying by the gear ratio. The Ford 8.8-inch axle has a cast center section and the internal components are installed from the rear. 3.00, 3.25, and 3.55; so I know at least those ratios were all available from the factory in the 8 inch rears. is the strongest factory case made BY FORD!!! Gross Vehicle Weight ( GVW ) would You can then enter any term, such as Axle Ratio,to search the guide. 54" In order to verify a nodular unit, you need to look on the inside of the casting. Ford differential tags are very . 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. At this width, many were used in street rod applications without modifi cation. What Is Car Battery Voltage And Why Is It Important? The Lincoln LS and Jaguar S-type were equipped with an 8-inch, castaluminum, independent- style carrier. Gear ratios can be quickly changed by removing the axles and driveshaft, unbolting the . Fords 9 inch rear axle was produced from 1957 through 1986 and was installed in nearly every Ford passenger car and truck at one time or another. The Ford 9 inch housing is a semi-floating, drop-out axle. Some of the heavier cars like the Galaxies also received the Only the N-series cases are made out of the stronger, more desirable, nodular iron. same width, but the distance between spring perches is different between Read more: Torsion Axle Vs. That is your vehicles axle code. tubes with flat tops, 1969-1977 Galaxies (coils), Lincolns (coils), and late pickups (leaf)- 3.25 The same applies to vehicles with codes containing numbers alone. it was very complete. Mustangs and Fairlanes. 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 See all 20 photos. This is an example of the brakes that fi t the small wheel end bearing for a 10 x 2-inch-wide drum brake on the left and a 10 x 1-inch on the right. 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. There were many instances of cuts and scratches from the thin steel tags sticking up on the axles. Ford 9 inch axles different from other high-performance rear endsare how the ring and pinion gear is accessed. Housing end bolt patterns can be confirmed on the bottom of the axle order form. GM Truck Complete Rear End Packages. Dont be surprised if the tag you have does not exactly match this. When it comes down to actual shafts as well, since the truck lug This is because the supply is limited to small bearing housing can be differentiated from a large bearing housing Keep in Many people prefer to just call it the Ford 9-inch-style wheel end. This format is also applicableto casting date codes. Finally, using bearing retainers that secure the axle at the flange, versus a C-clip style that secure the axles at the differential, means in the case of axle failure the axle flange and wheel will stay with the housing and not leave the vehicle, potentially causing brake failure and lack of control on the racing surface. The axle tag typically has two lines of numbers and letters stamped on it. 1973-1979 Ford Truck Rear Axle Codes. 59.25 inches to 61.25 inches, 1957-1959 Ranchero and station wagon rears, 57.25 inches, 1967-1971 Comet, Cougar, Mustang, Fairlane, 59.25 inches, 1967 Fairlane 63.50 inches (coil springs), 1957-1959 Ranchero and station wagon 57.25 The first table is the code and gear ratio. 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. in the backside middle and stronger tubes. The very rare optional 6 cylinder rear was the 3.50. Axle For example: The tag will say: 350 for 3.50:1 ring and pinion gear ratio. popular early swap being the 1957-1959 Ford for the 1965/1966 Mustang. The most 6. 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. weakest and had abrupt ending but welded carrier centers to tubes and a The Ford 9-inch can be found under 1974-1986 F-150s and 1978-1986 Broncos. to the housing, the small bearing housings use 9/16" socket size nuts With the chart in hand, locate your vehicles axle code on the axle code column. We're 31-spline carriers and "Traction Loc" style posi unit. It was then replaced by the Ford 8.8 inch rear axle. 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. much more difficult to locate. There are a few exceptions that you will see in the Ford Axle code chart. Now that you have identified the axle code, let us know the axle ratio. at car swap meets and shows are the units pulled from trucks with the the Broncos from 1966 to 1977, they stayed with the 28-spline units. . Some have only one access hole for the backing plate bolts, while others have three. Here is an example to help you through. Drag Racing 101 ~ Everything You Need to Know! The Ford 8.8-inch axle has the same ring gear mounting distance (see Chapter 7) for all ratios, just like the 9-inch. carriers, while sometime in the early 70's the switch was made to mostly Therefore, these axle assemblies require better quality oil and good underbody airflow to keep the unit cool. Variations There were also 8-inch ring gear independent carriers in production. . Theres an easy way to tell an 8-inch apart from a 9-inch. There is a very fundamental difference between Fords 8.8- and 9-inch axles. Nine Inch Rear Axle. - as in the Mustang line, most however never received a factory 9-inch). It The top line typically starts with a three-digit axle model code (or the prefix of the part number), followed by a dash, and then thesuffix. 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. I put together a whole collection of housings and third members. Along with the many different brake and wheel end varieties, many different styles of axle shaft ends were manufactured.

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