I've got the transmission out of my '01 GMC Sierra putting a new torque converter in it. Would you refill with Dexron VI at $5/qt or not. If not, should I just refill with Dexron III or go with Mobil 1 ATF?
I personally plan to try out the Dex VI in my vehicle with the same transmission. It should be an improvement over standard Dex III and I can get it cheaper than Mobil 1 which I have been using as well. There isn't much experience in people using it on older transmissions yet so there is no way to know how well it might work.