Thread: is my tranny slipping ?

Thought I'd join this convo, I have what I think is tranny slip. It happens sporadically during high temperature days, at low speed usually from a stop or rolling stop once I accelerate again. Usually from 1st to 2nd. I've asked a local service guy and he suggested getting a software update as (also mentioned in this thread) the cpu learns driving habits. I've owned this car since day 1 (2004 Grand Prix GT2). Just would like more input before putting $$ into it, at 144K miles. Thank you!

Originally Posted by Sporto

Thought I'd join this convo, I have what I think is tranny slip. It happens sporadically during high temperature days, at low speed usually from a stop or rolling stop once I accelerate again. Usually from 1st to 2nd. I've asked a local service guy and he suggested getting a software update as (also mentioned in this thread) the cpu learns driving habits. I've owned this car since day 1 (2004 Grand Prix GT2). Just would like more input before putting $$ into it, at 144K miles. Thank you!

Thought i'd chime in here for this as I am having the same issue as you are and also the same year and model. I don't think the tranny is slipping per say. When it starts doing it, look at your temp gauge. I bet it's a line or 2 above the halfway mark correct? If it is, it's the temp getting a little too high on the tranny. I've noticed that on mine that it will only do it when the temp gets just a little too warm because in my case, if I let the motor cool down and get it right below the halfway mark, it won't do it anymore. I have posted on here before about the issue and looks like the best solution is to install a tranny cooler and get ready for a rebuild. A tranny cooler, a shift kit and maybe some lucas will buy you some time but looks like your heading towards the inevitable rebuild.

Originally Posted by luckyg817

Thought i'd chime in here for this as I am having the same issue as you are and also the same year and model. I don't think the tranny is slipping per say. When it starts doing it, look at your temp gauge. I bet it's a line or 2 above the halfway mark correct? If it is, it's the temp getting a little too high on the tranny. I've noticed that on mine that it will only do it when the temp gets just a little too warm because in my case, if I let the motor cool down and get it right below the halfway mark, it won't do it anymore. I have posted on here before about the issue and looks like the best solution is to install a tranny cooler and get ready for a rebuild. A tranny cooler, a shift kit and maybe some lucas will buy you some time but looks like your heading towards the inevitable rebuild.

Interesting, I think first I'll get the tranny serviced (Fluid, Flush, Filter) see if it improves going into the summer and the above 60's, 70s, 80s temps here (Indiana).

Originally Posted by Sporto

Interesting, I think first I'll get the tranny serviced (Fluid, Flush, Filter) see if it improves going into the summer and the above 60's, 70s, 80s temps here (Indiana).

Yes I forgot to put that. But don't flush the fluid unless you have been servicing the tranny regularly. Flushing it might end up doing more damage than good. Just do a pan drop and replace the filter and add some lucas if necessary.

Originally Posted by luckyg817

Yes I forgot to put that. But don't flush the fluid unless you have been servicing the tranny regularly. Flushing it might end up doing more damage than good. Just do a pan drop and replace the filter and add some lucas if necessary.

Okay so I replaced fluid and filter only (no flush) and shifting has "worsened"...now shifting is elongated, erratic and basically starting to annoy me...so next step is either software update and "the next step" or jump to the "next step" and pay for the scan/scope. Any thoughts and ideas are appreciated.