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TH350 Transmission

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Baytraveler

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My TH350 is not upshifting when hot. It shifts fine when cold or when the outside temp is in the 80's. Any ideas of what would cause this. Please let me know.

Thanks for the help!
John
 

wishuwerehere82

Well-known member
Joined
Sep 6, 2003
Messages
2,314
Location
Rochester, NY
Corvette
Red '82 Coupe,Sebring Silver '98 Coupe
It could be a valve sticking in the valve body. You might want to try changing the fluid and filter in the transmission.
Or it could be the vaccuum line to the vaccuum modulator collapsing or opening to outside air when it gets hot.
Check your Modulator line, there are short pieces of rubber hose that connect the steel line to the transmission and to the intake manifold.
 

wishuwerehere82

Well-known member
Joined
Sep 6, 2003
Messages
2,314
Location
Rochester, NY
Corvette
Red '82 Coupe,Sebring Silver '98 Coupe
One other place to check is the transmission cooler lines that connect to the radiator. They could be collapsing or kinking in the heat if they are very old. That will cause the transmission to overheat.
Good luck, and welcome to the Corvette Action Center!
 

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