hamster":fj90lwmn said:
The GM auto boxes were not up to the job on 9000s and 9-5s and tended to need a rebuild sometime between 70,000 and 100,000 miles.
wiki says the 9-5 used Aisin Warner 4 and 5 speed autos - dunno about the 9000, but I know Vauxhall and Toyota (I think) and probably some others used Aisin Warner boxes too, from around that era.
I did a good few 100 thousand miles with the 4 speed AW (AW50-42LE) and with Volvo software, at least, they were bombproof. I personally drove around 200k miles in a Volvo S70 with that box in, and it had about 80k on the clock when I bought it. The auto was brilliant, no slippage, bangs, thumps or any issues in the time I owned and heavily used it. But then I did follow 50k intervals for ATF changes.
The 5 speed Aisin Warner box (that wiki says was used in later 9-5s) was also used by Volvo and Vauxhall, and probably other makes, and in theory sounded better, but my experience of it, was that it was more fragile, and blighted by some poor software decisions, that had consequences for serviceability. Volvo recognised the 4 speed box was strong, in that it tended to be the one favoured for the higher powered Volvo 70 series (classic).
Thing is, though, I suspect software and service schedules (most marques discouraged any servicing or ATF changes in modern-ish autos) are what undermines reliability of modern, electronically controlled transmissions. I've known transmissions be pretty much bulletproof when used / installed on one particular make and model, yet in another (with persumably subtly different software) reputed to be a bit fragile.