Parts Cost: The vacuum modulator replacement part itself usually costs between 30 and 150. However, the total cost can vary depending on the specific vehicle and who does the work. Its very difficult to install a seal without damaging it without the tool. The typical cost to replace a faulty transmission vacuum modulator ranges between 150 and 390 for parts and labor. When replacing the shaft seal its best to use the tool because the sharp edge on the shoulder of the shaft at the end of the threads will nick the new seal almost every time. When installing you just need to snug the bolts up. the person that rebuilt it is stiffin him on it, been a few years since ive been into a turbo 350. As some of you know, I had my 350 turbo tranny rebuilt by a friend going to an automotive school here in Sac. Over time, the cooling lines can wear out and develop leaks. I had an aluminum pan (from TCI on the TH400 I used to have in my 66, and. This back and forth flow allows the fluid to release the heat it gained before pumping it back into the transmission. The pan may be warped, you can check it with a straightedge if you remove it again. Once I figured this out I started using the black paper gaskets and every steel pan I encountered I would flatten out the pucker around the bolt holes. levisnteeshirt said: got a friend that called me, his turbo 350 govenor cover is leaking, and he said its building pressure behind it, that once the covered popped off the transmission. My rebuilt 350 tranny is leaking from the shift shaft. Transmission cooling lines are responsible for moving the transmission fluid into and from the transmission. Over tightening the pan bolts when using a cork gasket puckers the bolt hole until it makes contact with the trans case making it impossible to keep the pan from leaking. The steel pans are also a common leak point because the bolts usually get over tightened trying to stop a leaking pan gasket when its actually the shaft seal. The shift shaft seal is a very common leak point and it does appear to be leaking from the pan gasket when it leaks. I have a lot of experience fixing leaks and fixed a lot of leaky Turbo 350s that nobody else could seem to fix. I use to work at a transmission shop back in the late 80s.
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