Gm rear end casting numbers decode5/16/2023 ![]() All of the 8-inch case nuts can be accessed with a socket. There’s an easy way to tell an 8-inch apart from a 9-inch. ![]() 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. Many people are not aware that Ford made a smaller banjo axle and confuse the 8-inch for a 9-inch. It may seem strange to begin by comparing the 8-inch to the 9-inch axle, but there is an important distinction to make since the 8-inch axle is weaker than the 9-inch. 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. I reference these axles based on the ring gear nominal outside diameter in inches. There is a very fundamental difference between Ford’s 8.8- and 9-inch axles. The third member supports all of the gears and bearings, which allows for easier gear ratio swaps if you have multiple third members. The cast-iron third member is installed from the front of the housing. You can use the social sharing buttons to the left, or copy and paste the website link: Īn assortment of Ford 9-inch axle stampings is welded together to create the housing. SHARE THIS ARTICLE: Please feel free to share this post on Facebook / Twitter / Google+ or any automotive Forums or blogs you read. For a comprehensive guide on this entire subject you can visit this link: LEARN MORE ABOUT THIS BOOK HERE This Tech Tip is From the Full Book, FORD DIFFERENTIALS: HOW TO REBUILD THE 8.8 AND 9 INCH. In this chapter I share a summary of decades of work on these axles. 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. 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. 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. That and few run a 283 any more, most are 350's or 383 cube engines.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.įirst, you need to understand some fundamentals of the Ford axles to help guide your quest. Today every one has a SBC that can make 500 horse on the internet, not so much on the street but they still make more power than a similar sized engine from the early sixties thanks to bigger heads and more modern cams. The 327 made the scene in 1963 and was the coffin in that rear end as a 327 could also break it with ease. Chevy minded because they were paying to fix them. But customers didn't mind as warranty covered the repair cost for five years after date of purchase. The 348 introduced in 1958 was breaking them all the time with a manual transmission. The 283 from 1957 was pushing the upper limit of the design limit. The rear end was designed for a 215 cube six, and was in dangerous territory with the 265 cube V8 introduced in 1955. I got very good at rebuilding them.įinally found a '63 Olds in a junk yard and installed the Pontiac-Olds rear in place of the Chevy rear end and then I moved on to breaking T-10 four speeds.īack when these cars were on the designing board the engineers designed them to meet 150% of the anticipated torque load. I used to carry a spare rear end, with me in the trunk when I had my 409 powered '53 Chevy. Every GM part has a unique number (the casting number differs from the part number) and is basically how they knew what mold to use to cast the part they wanted to make.Ī whole bunch of what you have now. The limited slip differential was offered in the "P" case only and it will not fit inside an open case.īB0723 is the casting number for that case. Unless there is the letter "P"cast into the case it is an open rear end. It was carried over after the war through 1964 were it was replaced with a Spicer rear end purchased because the 348-409 and later 327 engines would break it with ease. As such it is weak in comparison to any other rear end you will find designed for use behind the 85 horsepower 216 cubic inch six introduced just before WWII. All of the other GM brands used a bigger stronger version of this rear end because they all had eight cylinder engines long before Chevrolet ever did. That is a Salisbury style rear end (drop out center section like the 9 inch from Ford) that was used by Chevrolet. Not an 8.5 ten bolt that wasn't produced before 1972.
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