Re: Ultramatic Transmission External Trans. Fluid Cooler - 1956

Posted by HH56 On 2009/4/28 9:43:21

Concur with PackardV8 on this one. The fact that the trans was slipping both in the past and now is apparently heating to the point oil darkened indicates a mechanical problem.

The two most likely:
1) either the linkage and resulting throttle pressure is not accurately sensing the speed load and commanding enough pressure to the system or
2)that pressure or another is being diverted due to a leak around one of the bushings or sealing rings.

The pressure keeping the high range clutches tightly engaged varies and is dependent on load. Too little pressure will allow them to slip with the friction overheating everything. The more heat, thinner the oil, more slippage, more heat until a point is reached where the car sits there unable to move.