Re: Trans Fluid for a twin ultramatic? Power Steering fill mark and fluid?

Posted by BH On 2011/9/24 10:45:16

Research shows that the original Dexron was backwardly-compatible.

Later formulations of Dexron are billed as being backwardly-compatible with previous versions, but be careful. I've read that GM recommends AGAINST using Dexron VI in NON-GM transmissions where Dexron III was previously specified.

Dexron III can be used in place of Mercon V and earlier formulations thereof.

Yet, I digress...

Personally, I'll stick with Type F, as recommended by Ross and others for Ultramatics with OE or factory replacement friction material.