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

Posted by Tim Cole On 2011/9/24 7:29:30

It's in Vol 29, No 8.

They don't call it Dexron - sorry for the misrepresentation - I should have called it a Dexron type.

The fluid recommended has "anti-friction properties" to improve clutch life.

Since then there have been iterations of Dexron, but to me the implication is clear that they preferred an additive containing friction modifiers.

Maybe they were groping for a solution given all of the problems they were addressing with the transmission.

The question here is whether the ultimate clamping force is the same using the Dexron or Type F.

For example I have driven Ultramatics that had occasional direct clutch chatter and I know were filled with Dexron. When I suggested testing Type F the response was disinterest because the car went down the road. Also, they thought perhaps the problem might be exacerbated by a "grabbier" oil.

As to those owners who remedied chatter by switching to Type F, I absolutely agree but not neccesarily because of removing friction modifiers. Line pressures under Type F may be higher.