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1997 Pontiac Bonneville: shifts hard..1st and second gear..gets warmed…

Customer Question
Hi, I have a 1997...
Hi, I have a 1997 Pontiac Bonneville that shifts hard in to 1st and second gear only when the transmission is warm. It does not do it in the winter time until the trani gets warmed up.The tranni has never slipped or anything like that?
Submitted: 8 years ago.Category: Pontiac
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Answered in 4 hours by:
6/13/2010
Pontiac Mechanic: John, GM FACTORY CERTIFIED TECHNICIAN replied 8 years ago
John
John, GM FACTORY CERTIFIED TECHNICIAN
Category: Pontiac
Satisfied Customers: 9,176
Experience: ASE A1-A8 w/L1 GM master technician.Factory certified/40 years experience
Verified

Hello & Welcome to JA,

 

Your problem is most likely a shift solenoid that gets weak after hot or a sticking valve in the transmission valve body due to accumulation of internal debris.The repair for this is to have the transmission valve body removed ,cleaned,shift solenoids tested,inspected for smooth valve movement & reinstalled.

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Customer reply replied 8 years ago
That sounds like a possibilty but when I had the tranni serviced there was no debris, just curios is doing that work that you told expensive?
Pontiac Mechanic: John, GM FACTORY CERTIFIED TECHNICIAN replied 8 years ago

You cannot see the debris inside the valve body without removing the valve body.I am glad you think it is possible since GM engineers has documentation of this problem.

This is about a 300.00 job,depending if solenoids need to be replaced.

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Customer reply replied 8 years ago
Thank you very much I will look in to it.
Pontiac Mechanic: John, GM FACTORY CERTIFIED TECHNICIAN replied 8 years ago
Ok,you have a good evening.
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