slickman

I know this topic has been beaten to death but after reading all the posts I could find, I'm still confused. I want to change my fluid and I have 5 qts of Dexron III in my shop. I have seen guys says to use Moble 1, RP Amzoil and Dexron III.

Seeing I have 5 qts of Pennzoil Dexron III, should I just go and use that? I do have some grinding issues from 1st to 2nd gear at RPM's over 4,000 - 5,000 at times.

Your thoughts?

RedFire281

Ford recommends Mercon V as you probably know, although I understand that Tremec recommends Mobil 1 ATF or Dexron III (don't quote me on that). I'd say if you use the Dexron III also add Lubegard to make the Dexron III act more like Mercon V just to be safe.

slickman

The tremec web site states dexron III for the 3650. I know ford says dexron V but i understand thats wrong.

slickman

Correction. Tremec states dexron III but you can use dexron V.

CAR-15

I switched to RP on my Mustang with 57k on the clock. I had the same problems shifting from 1-2 at high RPMs. After about 700 miles I can now make the shift and it seems to be getting better every day.

slickman

I'm leaning towards RP, I'm going to call Tremec tomorrow just to see what they say.