First off, a disclaimer: I don’t know a lot about automatic transmissions. I want to learn more about them which is why I am here as opposed to going to the shop to have it repaired. With that said, here is the problem.

Engine: 350 SBC

Transmission: 350 TH

Vehicle: 1947 Studebaker Pickup

Current Condition: Power plant combo was installed in truck in the mid 90’s. Mileage
on the engine since install is less than 10,000 miles (the truck
was not driven often, mainly car shows).

Problem:

It feels like it takes about twice as long than what a “normal shift” from first to second would be. In addition, once the transmission gets ready to shift to second it jolts hard. This will happen every time. The other shifts are not as pronounced and I would almost believe that it is only from 1st to 2nd that is the problem. I also have a problem going from a dead stop and accelerating over a hill. The truck will crawl and almost die up the hill. During this time you can feel the transmission “wind” up as if it is catching up and then a jolt and away we go up the hill! I can’t count how many times I had to wave the cars behind me to pass me.

Since these problems have occurred I have replaced the vacuum modulator in the transmission, verified that the fluid is at a good level and that the transmission is not burnt. I have also removed the governor, but do not know what to look for to determine if the part is bad. The plastic gear on the governor looks brand new.

I am sure I have left out some information. I appreciate the help and look forward to the replies.