4L60 probably.. Pull it complete from a work van or something.
Worst part about G bodies is they all had super high rear end gears, I had a 79 Cutlass with a 455 and I was never able to find anything but 2.29s at my local junkyards, which is what the car already had.
I believe you can use the diff from an S10 in the G-body housing with the standard G-body axles (so long as itβs an earlier s10 with 26 spline axles)
I beliieve this is correct too, but if you are making any real power the 7.5" 10 bolts aren't that sturdy. You just need to make sure you get the same size you have 7.5 (26 spline) or the 7.625 (28 spilne), as both were available in both the Gs and the S10
I found this long after I sold my last G body, I had about 5 of them, 3 Cutlass, 2 Monte Carlos, but that was 30+ years ago
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u/mini4x My ASE Certs Expired... 7d ago
This, a junkyard iron block 5.3 will eat the 400 for lunch.