Don't know if they took a hit or not on torque capacity. The only plastic parts I recall are some thrust washers, spring locater, and the alignment sleeve for the one way clutch.pdq67 wrote: ↑Thu Nov 30, 2017 4:54 amI read somewhere years ago that the TH400 was good for like 800T(?) and 500,000(?) miles, but after GM's, "Bean-Counters", got done with it, it dropped some T and was good for like 200,000(?) miles!
I think it was after they started using plastic parts in it, but don't know for sure?? I bet an older tranny rebuilder guy could tell you for sure about this....
And I will say that MOPAR's 727 auto trans is a good one! Sucker shift's like, "the kick of a shotgun"!
Colorado, didn't know the TH475 straight cut gear set was weaker. In the earlier class A motor homes with the helical gear sets, failures weren't uncommon. I'm guessing that is why GM made the change. My mention of the good stuff in the TH475 was slanted at the high element sprags over the normal roller clutches.