2000 Mitsubishi Montero Endeavor mechanic replaced transmission now it shifts correctly in 4WD, but up-shifts on its own in 2WD?
A year ago driving the SUV, it wouldn't go forward after leaving a parking lot. We'd had some issues with it for about 6 months before it stopped all together, like it had difficulty gettin going when it was cold but after it warmed up it'd shift smoothly. Took it to Mechanic (still has it in his lot) who replaced the Transmission. He says he put new sensors in it and replaced the solenoids. He says it will shift normally in 4WD but when it's in 2WD it up-shifts on its own. It's an automatic transmission. He has all but given up on it, we've paid him in full a few grand, naturally any help would be appreciated.