![]() To really know what is inside you have to pop the rear inspection cover and count teeth an note if it is an open rear, or a spool, or a limited slip rear (all are a possibility). So you can look at the casting numbers to eliminate the possibility of a two series center section having a 4.11 posi inside because they don't fit. Shop by Differential Differential Models GM 7.5' & 7.625' 10 Bolt Rear End GM 8. Two rear end casting numbers have been found on 12-bolt rear ends, 3894939 on early models. Some things can not change, and that is the casting. We make it easy to verify your exact rear end by providing specs and year, make, and model applications for each differential listed. The date code on a rear end housing is simple to decode. People change gears, axle size, and differentials especially if they are taking it out of one car and putting it under another car. As the name infers, the casting number is cast into the block when the block itself is cast. The rear axle identification code consists of a two letter prefix indicating the gear ratio, four digits indicating the assembly date as month/day, and a single. But most Nova four speeds were Muncie four speeds.Īs to your rear end what the numbers said back in 1972 may not still be true today. You can look on line for drawings that will enable you to figure out what you have. If it has a cast iron case it can be a Saginaw four speed or a early Borg Warner T-10. I would like to know if the differential is limited slip and what ratio if I could get this information.You can read this Super Chevy reprinted article about identifying a Muncie transmission. This car was originally put together in the middle 1970's. heres some other casting numbers on the top rear driver side reads CON2 lower same side reads K242. The casting date on the L6 block is on the right side. G304 1, what does it mean, the number GM23, what does it represent. Here are the engine block casting numbers used for small blocks and big blocks. (Accurate identification using the GM RPO code assumes that the rear end has not been previously modified) The prefix is usually F, G or H when referring to. Like : I 2 9 8, was does it represent (it is a Capital I followed by the numbers 298. Identify your GMC or Chevrolet rear end gear ratio by the RPO Codes, usually located on the placard labeled Service Parts Identification inside the drivers door panel or glove box. What I would like to know is what the Code's interpret to. Can anyone confirm is this is a Pontiac Bird differential or what car it might have come from. I dont think the vette codes are in here, though Attached Files: 55-64rearcodes1.jpg File size: 127. for example A 12 3 would be squirrel, SHARE POST 2 squirrel Member from Sierra Vista AZ These are the stamped two letter codes. This assembly was replaced by a phase-in of the 1-7/8 pinion starting in the 1969 model. 455 ho only(c-type axle) 12 bolt 1970 3.36 cok col fb 1970 3.55 cow cox fb 1970 3.55 wv xv gto 455 ho only(c-type axle) 12 bolt 1970 3.55 wh xh gto auto/manual 1970 3.73 none coz fb 1970 3.90 none xk gto auto/manual 1970 3.90 wk yk gto only used with m-21 trans 1970 4. The case has another casting number (which is upside down) and it is located on the Ring Gear/Pinion Gear case, where it attaches to he Passenger axle housing, this number is: GM23. Casting date codes have the last digit of the year as the last number of the code. Carrier casting numbers: 1634985 (1957-1964), 2070742 (1961-1969). Might find them with a closer look, wire brush/degreaser. On the passenger axle housing, on the forward leading edge is a stamped code of: " P.E. Hello, not to challenge the Boss but, the rear axle stamp numbers are different from the casting numbers, are easy to miss if covered in road dirt & grime. There is also a number on this same area, it is the number " I 2 9 8" along with a casting clock which points to the number 7. 14094065 Leave a comment at the end of this post if you cannot find the information you want. The GM pinion case casting # is 1254333, this number was taken from the Pinion part of the case casting, on the drivers side of the case. Chevy Exhaust Manifold Casting Numbers Lookup Type your exhaust manifold number in the SEARCH BOX below. There are "NO" signs of mounting rings on the top left/right of the Pinion * ring gear housing, indicating it is a leaf spring vehicle. The Differential in this car is a 10' bolt, 8.5" Gm differential that is designed to have parallel leaf spring mounting to the vehicle. ![]() The GM / NOVA Forum suggested I try here. Last year I purchased an "old school" 1936 Chevrolet Master Deluxe Street Rod and I'm in the process of making clean-up mods to it.
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