Re: Twin Ultramatic Lifespan.

Posted by Tim Cole On 2022/10/12 10:04:31

According to Hydramatic coupling phase of the Hydramatic was achieved only few miles per hour later than with a torque converter, but that fluid friction was reduced and efficiency higher than a torque converter during coupling phase.

When they are adjusted the first shift is barely felt. I love the Hydramatic. When they are working right, they have wonderful shift quality.

Bear in mind that I am talking about the traditional Hydramatic and not those gerotor units and stuff that came later when GM was trying to re-engineer the thing. An interesting aside is that in comparison testing the Hydramatic actually outperformed the Torque-Flite in straight line acceleration.

It's too bad the Borg-Warner transmissions aren't usable given the Ravigneaux geared units (Fordomatic two speed) worked the same as the Ultramatic and the three speed units did the same if you started in D2 range. I wish my modern car had that D2 feature because it was really good for snow.