Originally Posted By: Hokiefyd
Is the transmission the 4T80-E? Or the 4T65? I owned a couple of Northstar Cadillacs with the 4T80-E and that transmission was nearly indestructable, at least behind a Northstar. The 5.3L puts out more low-end grunt, though, so it could stress it more. Nice car!
Thank you! It's the 4T65E-HD, the same as the one used in boosted v6s. It does have a few extra hardened parts and a special 3 point engine mount system, but 323 lb-ft @ 4400 rpm is a substantial amount of thrust. I try to always keep my transmission temps below 185f, 200f if I'm really getting on it. Regular fluid checks, pan drops, filter change, and fresh M1 Dexron VI. It seems to really do well, but as you can see I just don't drop the hammer and light em up. I always try to feather it for best acceleration.