Re: Ultramatic ATF

Posted by Redhexagon On 2023/9/21 2:16:05

Dexron is supposed to be the replacement for Type A, but experience has shown that Dexron tends to produce too much slippage in transmissions originally designed for Type A, not just the Ultramatic.

Type F has greater dynamic friction than Dexron, and will reduce slippage for faster, firmer shifts that increase clutch and band life.

I run all my old transmissions that originally specified Type A on Type F instead. The worst-case result is that you feel more of a jerk when they shift, but that is sure a whole lot better than feeling slippage!

My Ultramatic is quite happy on Type F.