I agree. It will take time to see if it comes back. You may be fine but there's just no way to tell for sure until the PCM relearns everything.

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Scotty Hall
Bartlesville, OK
2001 Pontiac Grand Prix GTP
It whines a lot, but I like it.

The only limitation you will ever face in life is yourself!

well i just got done driving over 70 miles of stop and go traffic and so far nothing has changed. its starting to firm up the second and third gear shifts which im assuming is normal but so far no whine and no hard shifts. id think the pcm would have learned it by now....
also does it help to go slow while its learning or go through all the gears and wot? i went slow and got through all the gears the first 20 miles and the next 20 i went about half throttle when accelerating and the last 20 i mixed it up a bit. last 10 miles i logged were on the highway with no problems whatsoever.

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All that work and all those mods mean nothing if your ride isnt clean

Drive normal. Slow will make it adapt to the shifts too softly (wearing out clutches faster when you get on it) and hard will make it think it's going to be driven hard most of the time so it will go to hard shifts to protect itself.

It takes several driving cycles and all the various speed ranges and shifts for it to finish the adaptive pressure.

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2004 Impala LS - got some mods
NAIOA Moderator

Making you think twice before picking on Impalas

This is the first chance I have had to see this but what year is your car??? If you have a 98 or newer GT then you have a 4T65E. The 440T4 wasnt used after the 91-93 era depending on model so at best it would be a 4T60E and only if a 97 GT. Either way neither of those earlier transmissions had pcm controlled line pressure and that was only on the 4T65E between all the above three transmissions. Glad it worked out of its bug, like everyone else mentioned it probably just needed reset and had learned to a worn trans in its previous car. Sometimes the pressure control solenoid will be stuck or the pcm sees an issue and commands max line pressure until reset. The more you drive the car in all conditions the faster it learns, often the shifts start soft and firm up the more you drive the car just as you have noticed so far.

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www.TripleEdgePerformance.com
4T65E Transmission Info
Voted GPF.net Community Hero

thanks for all the help guys. so far everything is fine now. and trannyman i drive a 99 gt

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All that work and all those mods mean nothing if your ride isnt clean

Then this was in the wrong section, as you have a 4T65E.

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2004 Impala LS - got some mods
NAIOA Moderator

Making you think twice before picking on Impalas