The axle should have a code on it that starts with 7 (model year 77), then the two letter code above, followed by "O" for Oldsmobile, then numbers for day of year made, followed by another number for the shift it was built on. Example: CG1025B decodes to CG 3. Look on the front of the right axle for the code and it breaks down like this. 3 quarts of 85w-140, non-synthetic (API GL-6 rated only) Currie 9-inch Crate Rearends for 1964 thru 1972 Chevelle, El Camino, Malibu, Cutlass, Skylark, GTO, 442, Gran Sport, Tempest and other A-body vehicles, are complete ready to bolt-in assemblies with a choice of popular differential type, gear ratio and brake options, making. New Listing Yukon-Gear For Chevy El Camino 1977-1987 Thick Gear Set, High Performance (Fits: Chevrolet El Camino) Fast Shipping Perfect Fitment Hassle Free Returns. ![]() In 1977 you could have had the following ratios. ![]() Below is the post and the link to the forum.Īll ya gotta do is use the old SEARCH option up there!!įound this from one of my ramblings from a few years ago!! I think this could actually be a rear end from a 77 Cutlass. I also stumbled on this Oldsmobile website with info on the axle housing codes. Choose top quality brands Dorman, Motive Gear, Richmond Gear, Spicer. ![]() If I'm not mistaken, don't the 78-88 G-Bodies have a different external dimensions? I was told by a guy that races G-Body Regals that they won't bolt up without significant modifications. Buy a 1968 Chevrolet El Camino Differential Ring and Pinion at discount prices.
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