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Frank, Auto Service Technician
Category: Car
Satisfied Customers: 3420
Experience:  33 years experience,25 with GM,14 ASE certifications,
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98 Pontiac Montana: fully hot the transmission shifts gear

Customer Question

I have a 98 Pontiac Montana. When fully hot the transmission shifts up to the next gear with great force. Shifts normally when first driven(cold)
Submitted: 9 years ago.
Category: Car
Expert:  Frank replied 9 years ago.
You need to check for a transmision codes-odds are the problems is in the valve body and solenoids-the pressure control solenoid has the most problems.
Frank and 6 other Car Specialists are ready to help you
Customer: replied 9 years ago.
Reply to Frank's Post: what diagnostic tool do I need-available at auto zone?
Customer: replied 9 years ago.
if in fact the solenoid/valve body needs replacement is this possible with the tranny installed or is removal required?
Customer: replied 9 years ago.
need more info
Expert:  Frank replied 9 years ago.
The solenoids and valve body can be done on car-but it takes about 6 hours to do.They are behind the side sover on the drivers side of the trans