I don't know, and I'm not an expert...but...that's not what I'd expect based on decades of GM cost-cutting and GM's near-psycopathic need to soften shift "feel".Ok, maybe I'm wrong. I was thinking of the LS-based 4L60e...those are all the same.
There were dozens--maybe hundreds--of variations of TH 400, TH 350, etc. Not just year-to-year changes, but assembly differences like number of clutch plates in a clutch stack, placement of belleville springs in the pack, number of clutch release springs in the clutch drum assembly; plus the variations in spring stiffness in the shift valves, governor and modulator calibration...they built an incredible variety of transmissions over the course of the production run.
I'd expect that.I have heard on the earlier 4L60e, the V6 had fewer clutch plates than the V8...I don't know if that's actually true.
What "works" vs. what is Original Equipment can be different.So OP needs to just stick to a V8 truck? That still leaves Tahoes and Suburban's as potential candidates.