Every since i have installed a mopar performance pcm in my 2000 R/T the transmission has acted completely different. At first i thought it was all normal because the dealership that installed it for me told me that the trans would shift and act completely different.

We'll, when i installed it sometimes when i floor the truck at high speeds (around 70mph) it will try to kick down not one but two gears which would be too much and it makes the engine try to rev past 6000 rpm, but when i let off the gas it goes right back to normal.

Can anyone who has any info or expericence on this or with a mopar performace pcm please help. A friend of mine who recently test drove the truck mentioned that it almost seemed as if the trans ons slipping sometimes? PLEASE HELP!!

 

If you have your old PCM,install that and see if that helps. I'm guessing you have some type of tranny problem. It might be slipping or the cable needs to be adjusted.