It wasn't my supposition, it was the owner of the transmission shop, who worked for a major GM service center for like 10 years. I should point out that GM denies there is anything "wrong" with the transmission produced during those years, yet GM not only revised the very parts which are suspect in the transmission for later years, they released an improved overhaul parts kit for that transmission, and issued a technical service bulletin to all subscribers telling them to use the improved overhaul kit on any overhauls. The GM part is identical to the improved overhaul kit that had already been on the market for two years...produced by an aftermarket company who first identified the design flaws.How do you come up with the supposition that GM doesn't think a trans should last more than 100K if one mechanic says that 25% of their transmissions don't make it to 200K?
But there was 'nothing wrong' with the trans...OK!