87 Buick T-type Regal
LS2 (58x)
4L65E
E38/T42
08 Silverado OS
Novi supercharger
220/235 cam
ZR1 2.5 map sensor
LS3 MAF sensor
Long Story short, i dropped car off for tuning and was told the car needed bigger injectors , swapped out the #60's for FIC 80's, Tuner says car pulls like a freight train, runs great etc,
i pick up the car and notice that the car shifts to early , is in 4th by 36mph and converter locks up at 38 , it doesn't down shift although i havent smashed it to the floor , 4th doesnt kick down to 3rd , seems to just slip
i message the Tuner and its gets shady , he tells me to get a HP tuner kit and that i can upload and tune the Transmission parameters myself to my liking , I down loaded a stock 08 Silverado tune and what do you know i have basically a Tuned car with a stock transmission tune, Just doesnt make sense to give me back the car like that
Anyway i Now have a MVPI-2 Tuner and need to get this transmission figured out,
looking for a help from someone who has good experience especially with Truck operating systems