Transmission Slipping, Had Shift Pack and Computer Replaced, Now what?

  • 84,600 MILES
I can drive around my small town ok. However when I get on the highway I lose power when I get up to around 45 or 50 mph and it doesn't shift past 2nd gear. The tackometer stays at 0 for a few miles then shoots up to 5 or 6000 mark when im driving on the highway. The tackometer will also sit just under 1000 rpms when the car is in park, is this normal? The car makes a constant loud noise when accelerating. Also sometimes when I brake or sit idle at a stoplight the car will violently***** forward. The temp gauge goes up halfway mark and at the end of my trip it sounds like the fan is running very loudly.

I had the shift pack replaced. Computer was replaced and memory was erased. Now I don't know if I should get a total transmission overhaul or what? Could this be effected by the fuel pump or radiator is this solely a transmission problem?
Do you
have the same problem?
Friday, September 23rd, 2011 AT 12:19 AM

1 Reply

Make sure the fluid level is correct. Also check it for trouble codes with an OBD reader.
There are several things that can go wrong on automatic trannys.
Pressure in the tranny is low, shift module, etc.
The only way to track these things down as they are electro-mechanical is trouble codes or start replacing parts by process of most likley failed part, which is hard to do. So, getting the trouble codes is important. The fact thatit is modified will also make diagnosis tough as there may besome component that does not work well with some stock somponent.
The high temperature is a really bad sign as the transmission is so hot that it is overheating the engine coolant from the tranny cooler which runs through the radiator.
Whatever you do, do it quick and DO NOT drive the car if the temperature gets near the hot mark. You will damage the motor.
My first instinct is that the transmission needs to be torn down from the symptoms you desribe.
Automatic transmissions are not easy to work on and should only be serviced by a qualified transmission shop as many special tools are needed as well as experience.
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Friday, September 23rd, 2011 AT 12:32 AM

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