1997 silverado 4wd truck..had torque converter repaired-was replaced twice,thinking part was bad..(no prob shows up on computer.) just seems to be jumping out of gear when motor heats up,, at first the cruise control worked, but when it started acting up, cruise control went out too.have had oxygen sensor replaced recently also.. any suggestions? Linda
If this is a manual tranny you could have bad detent balls these hold the gear shifter in place of you could have bad gear teeth (dog teeth) on you gears and cincro gears Torque converter won't cause this problem. auto tranny check gear slector linkage and them servos in tranny to make sure they are fully ingageing
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The first step with any automatic transmission problem (if you haven't done it already) is to check the fluid level and quality. Inadequate or contaminated transmission fluid may result in shift failure or damage to the transmission. In particular, if the fluid is burned or has metallic particles in it, the transmission probably needs to be torn down and repaired. A clogged filter screen could also cause the problem, but this is rare unless dirt gets in or there is a worn-out part. If you have to rev up to high rpms to get the vehicle moving, you may have a torque converter problem.
P0740 JEEP - Torque Converter Clutch Circuit Symptoms - Engine Light ON (or Service Engine Soon Warning Light) - Transmission shift shock - Vehicle may not shift into the highest gear
Possible causes - Low transmission fluid level - Dirty transmission fluid - Faulty torque converter clutch solenoid valve - Torque converter clutch solenoid valve harness or connectors - Torque converter clutch solenoid valve circuit is open or shorted
When is the code detected? Torque Converter Clutch (TCC) unlocked for 10 sec., ECM commands converter lock-up and did not record engine speed drop.
P0740 JEEP Description The torque converter clutch solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Lock-up piston operation will then be controlled. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter.
Lock-up operation, however, is prohibited when A/T fluid temperature is too low.
When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.
It sounds like the torque converter is locked up. Possible a bad torque converter or converter solenoid. First thing you should try is unplugging the solenoid plug on the transmission. Drivers side, near the shifter. Not the three pin connector near the pan on the same side. The connector you want is higher than the reverse light plug.