[MatthewAMEL]

Use the HP-MTF from TREMEC.


I ran it for 5+ years in my 1LE (that got tracked 10+ times a year) and now am running it in the Blackwing. It's a FAR better fluid than the ATF.


The ATF is a cost saving measure for GM.


If you REALLY want to keep using the ATF, then make sure you follow the fill procedure. You have to allow room for the ATF expansion when it gets hot. That's why they have you fill and then remove 8oz. No such requirement with the HP-MTF.