Question about 2001 Pontiac Grand Prix
I have a 2001 Pontiac Grand Prix Gt. When I am driving on the highway at 100kph the rpms are at 3100. I have a feeling that it isnt shifting into overdrive and was wondering what the problem could be.
This trans is the 4T65E. It needs a 4th clutch hub. The splines strip off around 120k or more because they weren't hardened from the factory. The new ones have the hardened splines. The trans needs to come out and be partially torn down. I've fixed alot of these. Change the EPC solenoid while you are there. They wear and hang up causing intermittent harsh shifts
You can drive them forever without changing the hub but you'll never have 4th gear
Posted on Apr 02, 2009
I just fixed the same problem. This happened to me back in Sept. I was driving behind somebody uphill, about 45MPH, and I heard a "chirp", the tach increased and I list OD. I took it to a trans shop, they did a elec. check, and told me I lost the 4th clutch hub. This is so common, he grabbed one off the shelf to show me. I finally saved enough money and took it out myself. He rebuilt it in 1 1/2 days. Cost me about $900. But that was with a new convertor, and some shims, and the EPC, and with $300 of that being labor, got it back in a day. The car had 140,000 on it when it happened. Now I have to replace the front wheel bearings again for the 3rd time....
Posted on Apr 11, 2009
Although the Indicator says the vehicle is in "D" or "OD", is it really? If the linkage is mechanical, you may actually be in "3". Make sure the car is in neutral and pull the lever into the first forward position without looking at the indicator.
Does your vehicle have a switch to turn the OD off and you didn't know it? You may have inadvertently done this. In this case, though, usually there is a little dummy light on the dash that says "O/D off" or something like that.
Check the transmission fluid level on your vehicle and make sure it is to factory specification.
Posted on Mar 05, 2009
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Posted on Jan 02, 2017
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