Hard Shifts and Transmission Whine

[Cobraah1f]

I have a 2000 Impala LS with just over 100K miles. Recently started upshifting as well as downshifting pretty hard after being driven for extended periods of time. After being shutdown for awhile problem disappears only to reappear a week or two later. During one of the episodes I stopped in at a Cottoman Transmission shop to have it checked. Was told after test drive and computer dianostics that it had an internal slip code. The mechanic explained that the computer allows a certain amount of slip and once that amount is exceeded the computer shuts off the pressure control module and the hard shift is due to the full pressure shift. I was told there is likely at lot of wear and that the transmission would need to be rebuilt at a cost of $1700-2000 depending on what parts need replacing. Has any one had any experience such as this? I know anything mechanical wears out and there are fluke deffects but it seems to me the transmissions should last longer than the recommended tune up interval! Any related experiences and fixes or suggestions would be greatly apprieciated!

[guenther]

My 2000 LS had a problem with hard up and down shifting and it turned out to be a bad pressure control solenoid valve. It didn't through a code to the computer either.

[BNaylor]

Originally Posted by Cobraah1f

I have a 2000 Impala LS with just over 100K miles. Recently started upshifting as well as downshifting pretty hard after being driven for extended periods of time. After being shutdown for awhile problem disappears only to reappear a week or two later. During one of the episodes I stopped in at a Cottoman Transmission shop to have it checked. Was told after test drive and computer dianostics that it had an internal slip code. The mechanic explained that the computer allows a certain amount of slip and once that amount is exceeded the computer shuts off the pressure control module and the hard shift is due to the full pressure shift. I was told there is likely at lot of wear and that the transmission would need to be rebuilt at a cost of $1700-2000 depending on what parts need replacing. Has any one had any experience such as this? I know anything mechanical wears out and there are fluke deffects but it seems to me the transmissions should last longer than the recommended tune up interval! Any related experiences and fixes or suggestions would be greatly apprieciated!

What DTC code was found? If it was P1870 it is not good. It indicates internal components are slipping and you may be in for some major tranny work.

[Cobraah1f]

Well took it to another shop and they didn't find anything wrong with it at the moment. He said the previous shop likely clear the codes, so I need to drive it until it happens again then bring it back.

[MCO_Death]

Originally Posted by Cobraah1f

Well took it to another shop and they didn't find anything wrong with it at the moment. He said the previous shop likely clear the codes, so I need to drive it until it happens again then bring it back.

Just for a side note, seeing how they said 1700-2000 for a rebuild, Its not much more for a 'performance/racing' transmission

http://www.3800performance.com/Merch...roduct_Count=0

Thats from http://www.3800performance.com

Just a side-thought for that sort of price, I know if my tranny goes that way, i'd likely go for the performance tranny... thats just me thought