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!!

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2000 Dakota 5.9 R/T:
M1 Intake, Mopar PCM, Gibson Headers, Straight Pipes, AEM Brute Force Air Intake, 180 thermostat, 25% Crank Underdrive Pulley, etc...

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.

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Prime Performance 5.9 bored .030 over,HER1828AL Cam,HPHD-MAG1-SP Heads with 110 Springs,Crane 1.6 Roller Rockers,Ported Intake,Holley 52MM Throttle Body,MSD 24/lb Injectors,MSD Ignition,Hughes Engines Re-flashed ECU,Gibson SS Headers,etc.