Thread: TH350 transmission question.

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Don that sounds like the caught the seal when replacing the pump, I really can't believe they didn't fit a new seal when they did the job as that a common place for leakage.

The bolt gaskets are thin black washers.
Some GM trannies have pump bolts with a groove just under the bolt head that accepts an o-ring.
I've taken some apart that have had both installed. Only the proper one should be used on the proper bolt.
Take a bolt out and check it.

Its almost impossible to pinch or knick the large perimeter rubber pump seal when installing. The gasket behind the pump will not cause external leaks.

Check the seal at the dipstick. Oil leaks can seep a long way and appear they are coming from another spot.

Steve, I felt they might have done something in that area or maybe the housing itself had a burr or distortion there that won't seal correctly.

Pugsy, I will pull out the bolt and see if there is a washer/seal like you describe. As for the dipstick, we considered that but he is using one of the new Lokar short stick dipsticks that actually bolts on with a big nut underneath and a rubber seal. If it is leaking it would have to be out of the top part but it also goes down into an o ring seal. The kickdown linkage was glued in so hard he had to pry it off (also a Lokar)

I have two other th 350s in the shop, one B and M and one Jackson Racing and offered one of them to Dan but he reminded me his has the BOP bolt pattern and mine are Chevy. I know they sell an adapter plate but his car is all setup for the BOP so he wants to use it. I guess it will just be a matter of taking it back to the shop.

Don

Don i was referring to the seal where the convertor runs.

Originally Posted by Itoldyouso

Steve, I felt they might have done something in that area or maybe the housing itself had a burr or distortion there that won't seal correctly.

Pugsy, I will pull out the bolt and see if there is a washer/seal like you describe. As for the dipstick, we considered that but he is using one of the new Lokar short stick dipsticks that actually bolts on with a big nut underneath and a rubber seal. If it is leaking it would have to be out of the top part but it also goes down into an o ring seal. The kickdown linkage was glued in so hard he had to pry it off (also a Lokar)

I have two other th 350s in the shop, one B and M and one Jackson Racing and offered one of them to Dan but he reminded me his has the BOP bolt pattern and mine are Chevy. I know they sell an adapter plate but his car is all setup for the BOP so he wants to use it. I guess it will just be a matter of taking it back to the shop.

Don

Oh no, Steve, it looks like the convertor to pump cover seal is doing it's job........it is bone dry in that area. The areas that are showing fluid wetness are shown in the picture below, in red.

Don

I see Don, got to look at the pump it self then.

Originally Posted by Itoldyouso

Oh no, Steve, it looks like the convertor to pump cover seal is doing it's job........it is bone dry in that area. The areas that are showing fluid wetness are shown in the picture below, in red.

Don