Originally Posted by xtremerevolution
You sure it wasn't a 4T60E-HD? I know they had those but with special parts to where you couldn't just swap the diff from the 4T60E-HD to the 4T60E. I know for a fact this was the case for the Riviera for that year.
I'm positive I didn't quantify it on purpose
I'm not as familiar with the 60'* as the 65'*. But in the 65'* the trans is a trans is a trans and only a couple interchangable parts make it an HD. Pretty sure the 60 is the same way, except GM changed pitch of pinion, tooth count etc etc, nearly every year. That makes them seem much less interchangeable. But if you know the trans, you can do it easily.
As for chain stretch and the 60 not being able to back up the S2 L67, the issues the 60 has is less vanes in the pump. Therefore at high rpm where the S2 shines the trans cavitates and can't pump enough fluid. The chains are frequently modified to be used in 65'* as a single chain solution. Recently with the 5.3L being backed up with a 65, the HV-093 V8 chains were developed. They are supposed to be stronger than the 65'* original chains.
There are many faults with both transmissions. I wouldn't necessarily say that either is not suggested. I'd suggest doing the research and learning the various pro'* and con'* to both, then making an informed decision.
Like to eat diffs
Vacuum shift modulated
Don't like rpm
Eat 4th clutch hubs
EPC soleniod issues
Fully electronic and programmable
Add power and you can abuse anything into submission. Just ask the various race transmissions that have been behind my engine (aka "Shredda")