ford 9 inch rear end gear ratios chart

the best. Have 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. Ford Axle Code Chart: Everything You Need To Know - Gmund Cars What Is Car Battery Voltage And Why Is It Important? Some of the 9-inch truck differentials will have an exaggerated hump on the rear cover to . Keep in Our example is going to assume a 6000 rpm redline and 26-inch-diameter tires. Ford 9-inch differentials | Hemmings Repairing a twisted brake or throttle cable with a simple homemade tool in just minutes Easy and functional. 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. Like most Ford axles, the 9-inch has a single hypoid ring gear mounting distance, so, unlike the Dana and GM axles that require unique differential carriers based on ratio, a single differential carrier works with all of the Ford ratios. socket size and 7/16" fine thread. Gross Vehicle Weight ( GVW ) would Once you have identified the label, locate the word AXLE under the bar code section. The best gear ratio for a GM 10 bolt is 10,41 because it is the only ratio that allows your engine to turn 10,41 times per minute. Again, the overall first-gear ratio with the TH400 and 4.10:1 rear gear would be 10.168:1. - as in the Mustang line, most however never received a factory 9-inch). weakest and had abrupt ending but welded carrier centers to tubes and a Our Mopar flexplate buyers guide will help. mind as mentioned, the Fairlane spring perch distances were not the same Because of their strength, youll see these 9 inch rear ends used in just about every make of car, truck, and customs. Because of the long production history of this axle, many variants are available. 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. for 1965-1966 (the same width as 1964-1965 Falcons and 1962-1965 Fairlanes Mustangs and Fairlanes. Ford 9 inch gears - Strange Engineering Ford rear ends, or differentials, were manufactured by either the Dana Corporation or Ford. In 1963, Ford includedmore information. The WAR, WAA, and WAB cases have the same ribbing as the N case, but are missing the ever important N feature. A simple formula to calculate Gear Ratio or Axle Ratios. Interestingly, the Ford axle uses the exact same size of tapered roller bearings as the GM 12-bolt. (See Chapter 8 for how to install a 9-inch in a classic 1957 Chevy Bel Air as a performance upgrade.). On some tags, the first 2 digits don't appear on the tag, but they must be used to identify the axle. with 3/8" fine thread, while the larger bearing use 11/16" . truck housings received even beefier center carrier housings and tubes, The format has changed over the years but mostly follow this sequence:. A copy of the Ford Axle Code Chart is linked below in this article. Since these housings were a series of stamped-steel pieces all welded together, there were many different overall lengths, tubes sections, mounting brackets, and even general constructions over the years (see Chapter 5). Locate the Safety Compliance Certification Label on the driver's side front or rear door panel. The answer lies in several of the Ford 9-inchs design aspects, starting with the Ford 9 inch gears. In most cases, the tag has been lost. This combined with easy assembly makes it popular for fine-tuning a rear gear for any particular application. Proceed to match the code with its corresponding Axle Ratio column on the table to find the ratio. 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Gears / Diffs / Install Kits Listed By Vehicle, Standard Gears & Pro Gears Dana / Ford / GM / Mopar, Strange T-Shirts. (It was later used for pick-ups and Broncos.) There is a machined roller bearing race on the pinion head portion that points at the differential opposite thetapered bearing races. GM Tri 5 55-57 Chevy Complete 9" Rear End Package. Would very much apreciate it if someone would post it again. 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. So rare Ford dropped it after 66, when they also dropped the 7" Equalock. The image below shows the Safety Label of a Ford Truck. 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. The unit on the top left seems to be nodular iron but requires a little more investigation to verify. weakest and had abrupt ending but welded carrier centers to tubes and a 9-Inch Standard Ring And Pinion Gear Sets (3.00 to 6.50 Ratios) $240.00. This is a major advantage compared to other rear axle systems because disassembly is faster and more convenient. 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. 1967 Mustang - Axle Information Axle Size/Strength Chart; Explained Videos; Tech Articles; 9-Inch Ford. The axle identification tag is located at about the 3 oclock position under the third-member mounting nut when you are looking straight at the front of the axle. most abundant. if one wants to use a 31-spline truck carrier in a car. trucks varied more, early half ton trucks got the 28-spline axles and and this style of center carrier housing is best suited for drag cars or First, you need to understand some fundamentals of the Ford axles to help guide your quest. If the socket fits (as shown in our photo below) it is a Ford 8-inch housing. These labels have a specific code that is similar to the axle code on the 9-inch axles. 1950 Ford car rear end info.. - The H.A.M.B. From the arrow, you can see the axle code is H9. You can then enter any term, such as Axle Ratio,to search the guide. C-6, three-speed, automatic. Winners Run RICHMOND! Ford 9 - Smiley's Racing There is a gear ratio stamped on the tag. It "N Case" was no longer needed for passenger car/truck We'll also walk you through choosing the correct parts in order to make this installation a breeze! It was not the only axle used, but was by far one of Since the "Limited slip" or Locking rear end 1967-1973 Mustang axles can be identified by wheel flange: Oval hole = 28 splines; Two large holes and counter-sunk center = 31 splines. The narrowest production 9-inch axle is 56.375 inches. Another bonus is that the axleshafts are of equal length, so youll Ford codes may have one or two characters, but any code starts with a letter. wood and natural gas. in cars and trucks. Call 800.979.0122, 7am-10pm, everyday. 1/2 ton 4X4 pickups! for 1965-1966 (the same width as 1964-1965 Falcons and 1962-1965 Fairlanes How to Identify Ford Rear Ends | It Still Runs This is when making a few phone calls to reputable axle builders can be helpful. 9-inch complete rear axle is approximately 35 pounds heavier than an 8.8 rear axle with approximately the same components. The original carrier is normally equipped with a CV joint flange, which can be replaced with a U . Rusty but Rare 1976 Chevy K10 Sport Truck Revival! 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. Like the H in our case shows a car with a limited-slip differential. Leaf Spring: The Similarities And Differences. 1-wire alternators are perfect for engine swaps or just keeping things simple for your project. there is the letter "N" than this is a NODULAR CASE (GREAT) this The small are 2.835" or just under 3" and the large are 3.150" or just over 3". Boss 429s, 427s, 428 CJ/SCJ and the 429 cars which received the the best. Any Ford 9" carrier will fit, as long as it has a fill plug on the side. Home / Performance Front & Rearends / Parts Department / Ring & Pinion Sets / 9-Inch Ford. This axle tag belongs to a 1977 F-150. Note the two lower bolts at 6 and 7 oclock have straight access with a socket. Anyone know? can get your submission posted and acknowledged Remember to locate the Safety Standard Certification label on the left side door post as you open the door. There is a very fundamental difference between Fords 8.8- and 9-inch axles. Factory Original Gear Ratio | Vintage Mustang Forums CLICK HERE to see a complete listing of front axle codes). 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. housings. 8.75, 9.25, Ford 9 inch, and GM's 8.25 inch . How To Identify 9 Inch Ford Housings Chart via Speedway Motors. We stand behind our products with some of the smartest technicians in the industry. The "rough" There are four versions of the nodular iron third members that were produced from the factory. How To Choose the Right Gear Ratio for Your Muscle Car or - MotorTrend as the Mustang. for the 1971-1973 Mustangs - cars with 351 engines and up receiving the 9-inch Well show you what to look for in this buyers guide. Cost and complexity are two. We have a large selection of gear sets in stock and can recommend the correct . The Lincoln Continental style of disc brakes use 11-inch rotors. Calculating the torque multiplication that your axle gears provide is quite easy. 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. Ford Mustang Rear Gear Ratios | CJ Pony Parts There are even different pinion cartridges that have been available from the various production years and models for this axle. GM A-Body Complete 9" Rear End Packages. The The 8.8 is a traditional semi-fl oat Salisbury axle with C-washers for axle retention. Now that you have identified the axle code, let us know the axle ratio. Ford Rear Axle Assembly Identification - Page 01 . The These variations include different-size drum brakes, disc brakes, and wheel hub arrangements. and trucks throughout the 1970s. But it will also use more fuel in all situations because the engine's rpm will be higher. 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. 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.. actual car posi units, which were primarily 28-spline carriers, can be 1967-1973 Mustang, Torino, Ranchero, Fairlane 9-inch 70's. the few cars and early Broncos (and some early trucks) which received The heat treated aluminum alloy well suited to absorb high impact shock loads. The 7.5" rear end is also flat on top and bottom. It was then replaced by the Ford 8.8 inch rear axle. These axles had a stout 2.25-inch ring gear offset as compared to a 1.5-inch ring gear offset of the later 8.8-inch axle. widths I keep in mind for Mustangs are the following: 52" Both standard and W-series cases are made out of gray cast iron. 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. This is by far the most common axle used by restorers, hot rodders, customizers, and racers. For reference, this section from the Ford MPC is posted . 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. The 8.5- and 8.8-inch gears have even found themselves in the independent-carrier-style axles. medianet_crid = "364974658"; The Maverick 8" or Ranger 7.5 and 8.8 are good options. What Is Rear End Gear Ratio and How Is It Calculated? - Gear Nine Inch Rear Axle. (narrowest 9-inch housing), 1966-1977 Bronco 58 inches but has 5-on-5 1/2 inch 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. socket size and 7/16" fine thread. 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. 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. I reference these axles based on the ring gear nominal outside diameter in inches. Our experts will help you find the correct ring and pinion set for your particular application. Here are the internal sides of the same three units. The aftermarket Daytona-style pinion cartridge accommodates the larger and stronger pinion head bearing. for 1967-1970 (same as 1966-1969 Fairlane, Torino, Comet & Cyclone non Differential Gear Ratio to Tire Size Guide - | No road, no problem. In the early days of hot rodding, with the majority of hot rods being Fords, it stands to reason the '30s and '40s Ford "banjo" rearend dominated the scene. Ford Rear Axle Assembly Identification - Page 09 The large bearing size was available with fi ve different brake drum widths. and Fairlane axle housings are often grouped together because they are the 8. But to be correct, it is a 3/4 fl oat. Exceptions to this were the ultra Hi performance Boss 302s, How to Set up Your Rear Gear Correctly - RacingJunk News However, the critical aspects of the rear axle are the axle flanges and axle lengths. Notice the 8.0-inch ring gear diameter cast into the rear cover below the fill plug. Careful aftermarket shops and their stringent attention to repairing these housings are able to correct many of these issues. 1972 and earlier, 31 spline axles have the ability to be shortened. For example: Ford used 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/. for the swap to be performed. 31-spline axles and carriers for most trucks. 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 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. 65-66 Mustang = 57.25 inches. 1948 through 1960 Ford F-1 and F-100 Rear Axle (differential) Swaps Info To Share? Axle Ratio : Axle Ratio : Diesel: 5.13: 4.10: 3.55: Gas: 4.10: 3.55 : Trans Ratio: . This is because the supply is limited to This bearing is one of the reasons that the 9-inch has the reputation for being bulletproof. applications due to the demise of most performance engine options in the This larger offset (hypoid distance) between ring-gear . Differential Identification | West Coast Differentials I remember that the car had a bad pinion bearing and when I took the rear end apart the pinion would just barely fit through the pinion support hole in the case. tubes with flat tops, 1969-1977 Galaxies (coils), Lincolns (coils), and late pickups (leaf)- 3.25 Ford 9 inch axles different from other high-performance rear endsare how the ring and pinion gear is accessed. Amateur restorer. CASE" Rearend/Axle Length Calculator. 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. The A Lincoln Versaille rear is a 9" with 28 spline axles, big axle bearings, and disc brakes. Leaf Spring: The Similarities And Differences, Front Axle Of A Car: Types, Functions, And Replacement, CV Axle Boot: Overview, Signs, And Replacement. for the 1971-1973 Mustangs - cars with 351 engines and up receiving the 9-inch shafts. 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. if one wants to use a 31-spline truck carrier in a car. 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 . Choosing New Rearend Gears Is As Easy As 1, 2, 3, 4 is the strongest factory case made BY FORD!!! With the chart in hand, locate your vehicles axle code on the axle code column. of course most desirable is the N case, first used on the 427 Galaxies GM G-body 78-87 Complete 9" Rear End Package. Save my name, email, and website in this browser for the next time I comment. If the socket fits (as shown in our photo below) it is a Ford 8-inch housing. The The third member supports all of the gears and bearings, which allows for easier gear ratio swaps if you have multiple third members. The "rough" more plentiful starting in the early 1970's, many of the units found today 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. 67-71 Comet, Cougar, Mustang, Fairlane = 59.25 inches. A strong 9" with a nodular diff and 31 spline axles is fairly comparable in strength to a stock Dana 60 rear end. When it comes down to actual shafts as well, since the truck lug There is a ton of aftermarket support for this axle (see Chapters 3 and 4 for more details). Written by Joe Palazzolo and Republished with Permission of CarTech Inc. On this particular third member, the original copper washers that were under the factory fasteners have been discarded as well. Some axle shafts can be shortened and a new spline machined in place. Enter the required Overall Width, Pinion Offset (location), Brake Space and Drum/Rotor thickness to find axle length and housing width. This custom axle tag was obviously hand cut as evidenced by the sharp tin-snipped-looking ends and includes DSO, for Dealer Special Order. Variations But if youre looking for an original, they can be spotted quite readily even without an axle identifycation tag. These axles even have a unique bolt pattern of five on 5 inches. What rear end ratio do I have in my Ford is it posi! N-case. 2.75 open differential. There are a few exceptions that you will see in the Ford Axle code chart. In order to allow for the additional straddle mounted bearing and casting support structure, the hypoid offset needs to be large enough to clear the differential case. bearings, 28 and 31 splines, 57-68 passenger car and 1/2 ton truck - medium duty, stronger than Mustang 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. Are reviews modified or monitored before being published? some 302 4V cars with optional gear ratios). 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 it. A but the link i was refering to listed codes by year and model. station wagons-cars with 351 and up engines received 9-inch units - as did 800-646-6718. It has enjoyed a long production history with many variants. can easily tell this is a 9-inch from the hump in the rear and (2) 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. and 429CJ cars.From what I have seen don't expect to find them in 390 or The most The Ford 10.25-Inch Rear Axle Replaced The Dana 70 After 1985. You can install a true 9-inch gear in these housings as well. Later It was not the only axle used, but was by far one of Axle Boss 429s, 427s, 428 CJ/SCJ and the 429 cars which received the This is an example of the only Ford 9-inch version that utilized one-piece tubes. What gear ratio do I have in my GM or Chevrolet - Drivetrain Also notice the part number and metal axle tag. around 64-65 I believe.They are most often found behind the later 428CJ narrowed rear ends due to the added strength in the middle. Start by opening the left drivers front door. Our editors pick the products & services we write about. 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. You Before you embark on the rebuild and start scouring local scrap yards and online websites, it will be helpful to understand what to look for and what to avoid in these axles. Gear Ratios - RPM from Speed, Rear & Trans. Over several generations of small block Chevy (and big block Chevy) engines there have been several changes that dictate what flexplate works with them. This strengthens the whole rear end assembly. 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 chart serves as a general guideline for axle fl ange-to-fl ange width based on different models and production years. WJ Handy Dad assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. The 1960s to 1967s still retain the dimples but also have an oil level plug in the back cover. The larger offset is better for strength and noise but worse for sliding and efficiency. wheel drives) right up until about 1982, these housings are by far the It is common to find a 9-inch in a old Falcon or 6. The N cases typically came with the larger Daytona-style pinion support bearing, and 31-spline axle shafts. This is a sampling of some of them. applications due to the demise of most performance engine options in the Original ratios are 2.47, 2.50, 2.75 or 3.0 with the 2.50 being the most common. 3. Dont be surprised if the tag you have does not exactly match this. The last one i got was marked "Mustang Posi" on the rear of the differntial by the people at the yard who dissembled the car. It is an 8 inch rear axel so many parts interchange with many other years Fords and Mercury's using an 8 inch axel. By positraction, we talk about the type of differential the car uses, whether a limited-slip differential or a conventional non-Positraction differential. Refer to the Axle Ratio table to determine your rear axle ratio and Limited Slip. If the case has two verticle RIBS ,from top to Only the N-series cases are made out of the stronger, more desirable, nodular iron. 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. 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. Axle Ratio = (RPM X Tire Size)/ (Speed (MPH) X 336) Example 4.88 = (2881 X 37)/ (65 X 336) You bring the gumption. them. Buyers Guide. This is 2.25 inches for the Ford 9-inch and 1.5 inches for the 8.8-inch axle. Ford 9 Inch Rear-End Widths and Potential Donor Cars - Roadkill Customs 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. Your email address will not be published. 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 . dimples. Performance Front & Rearends GM Vehicles 76-77 large bearing. It has a square design with four rounded corners and ten bolts. 74-75 medium duty large bearing, and. You are correct sir, these are the standard ratios for 65-66. Torsion Axle Vs. I have spent countless hours over the years collecting, reading, and studying old shop manuals, supplier reference documents, SAE papers, and even vehicle manufacturer reports and notes. (CROSS SECTION WIDTH x 0.ASPECT RATIO x 2 25.4) + WHEEL DIAMETER = OVERALL TIRE DIAMETER. When you buy through our links, we may get a commission. 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.

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