My guess is valve body in the transmission went bad. Mine did the same thing, but I was stuck in a mid gear and could go 65 mph at 3800 rpm. My transmission temp got up to 205. Dealer fixed the bad valve body and serviced the transmission in 3 hours--all under warranty. Good luck
That should answer the maximum depth difference between the stock and the PPE so its not hugely lower. As to the PML pan, they don't make any claims that it fits the L8T with the same transmission and in fact leave their information confusing, however on the surface it says "for Duramax" and so its hard to say. I know a while back and not sure which brand it was that specifically stated that the extra capacity pan that particular company made did NOT fit the gas version.
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