Pontiac sunfire gt 2.4 liter motor 1997 have slippage between all gears automatic transmission had both relays on the trans check they are in good shape. I am told there is a modular on the side of the trans that is prolly going. Ad or my clutches the car runs great other than the trans problem. When shifting rpms seem to be 10 to 15 hundred over where it normally would shift. When driving if I slowly accelerate and let off the gas at shifting point it shifts fine same if you drive it grandma style still late shifts but no slamming or hard engagement of the trans. Has very little get up and go. This problem happend one day out of no where. Any help would be much apreciated!!!!!

Steve Allison

• 5569 Answers
• Posted on Dec 22, 2008

SOURCE: Transmission won't shift fron 1st, 2nd or 3rd correctly!

I'm no expert but it sounds as if you might have some moisture (water) contaminating your tranny fluid. I'd first try having it drained, flushed and refilled with fresh fluid. Preferably after it has been warmed to room temperature - -2 brrr. 

SOURCE: transmission is not shifting gears while driving

First check fluid level. is check engine light on? is speedometer working? this can be caused by a malfuncition vehicle speed sensor or a mechanical condition such as a clogged filtre.

SOURCE: My saturn was running fine. Then it would shift very hard

well if it shifts very hard into every gear that means the pressure control solenoid in the trans went bad and it causing the trans to go to max line pressure thats why it shifts so hard,,,it does that so you can still drive it even thou it broken,anyhow the PC solenoid is under the trans pan which is on the TOP of the trans under the battery,,,,not too hard a job to do, the parts are about $100 labor might be about $200,,,easy fix,,could be alot more,,,and if you dont fix it ,it will break other stuff in the trans and cost alot more,,,

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Rob Sinbad

• 709 Answers
• Posted on Nov 22, 2009

SOURCE: I have a 1966 Ford Falcon with a C4 transmission.

I would begin by replacing the filter if its not new, 2 possibility of issue, faulty shifting module or defective transmission rebuilt. just because it has been rebuilt does not mean the individual work on it did a good job. the less cost effective way is to locate used modulator from ebay or junk yard, if that does not rectified the issue than more likely it will be the tranny. the bad part is that I dont know of a company offer a bench test for the tranny modulator.