2001 ram 2500 won't shift into overdrive after engine swap

Asked by Feb 28, 2015 at 04:16 PM about the 2001 Dodge Ram 2500 4 Dr ST 4WD Quad Cab LB

Question type: Maintenance & Repair

Just had to change the engine in my 2001 dodge ram 2500 with a v10. I put an other 2001 V10 in .The motor purrs like a kitten. I know the computer takes a little time to reset it's self. The problem is that the tranny won't shift into overdrive now. The tranny worked fine before the engine swap. I'm thinking that the TV (throttle valve) cable needs to be readjusted, but not sure. Any answers to help fix the problem would be very helpful.

1 Answer

4,015

here is the power flow for fourth gear....sounds like you might have unplugged a electrical connector or didn't get it all the way in ...or pinched or pulled out a wire during engine swap...// FOURTH GEAR POWERFLOW Fourth gear overdrive range is electronically controlled and hydraulically activated. Various sensor inputs are supplied to the powertrain control module to operate the overdrive solenoid on the valve body. The solenoid contains a check ball that opens and closes a vent port in the 3-4 shift valve feed passage. The overdrive solenoid (and check ball) are not energized in first, second, third, or reverse gear. The vent port remains open, diverting line pressure from the 2-3 shift valve away from the 3-4 shift valve. The overdrive control switch must be in the ON position to transmit overdrive status to the PCM. A 3-4 upshift occurs only when the overdrive solenoid is energized by the PCM. The PCM energizes the overdrive solenoid during the 3-4 upshift. This causes the solenoid check ball to close the vent port allowing line pressure from the 2-3 shift valve to act directly on the 3-4 upshift valve. Line pressure on the 3-4 shift valve overcomes valve spring pressure moving the valve to the upshift position. This action exposes the feed passages to the 3-4 timing valve, 3-4 quick fill valve, 3-4 accumulator, and ultimately to the overdrive piston. Line pressure through the timing valve moves the overdrive piston into contact with the overdrive clutch. The direct clutch is disengaged before the overdrive clutch is engaged. The boost valve provides increased fluid apply pressure to the overdrive clutch during 3-4 upshifts, and when accelerating in fourth gear. The 3- 4 accumulator cushions overdrive clutch engagement to smooth 3-4 upshifts. The accumulator is charged at the same time as apply pressure acts against the overdrive piston.

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