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: 4l80E TC keeps locking and unlocking rplunger 06-28-2005, 01:56 PM 1993 K3500 6.5 4l80E transmission, torque converter keeps locking and unlocking. changed tcc solenoid. filter and oil, the pan was spotless no debris of any kind . is it possible the converter is comming apart.i need the truck to pull my trailer 500 on 6/30 briano 06-28-2005, 08:05 PM moving to transmission section, this is not an emergency related issue. rplunger 06-28-2005, 08:21 PM I,m sitting 500 miles from home! maybe you dont call it an emergency but i do!!!!!! 12vchevydually 06-29-2005, 10:24 PM I would check the tps,and also the input speen sensor.and you also need RPM ref, for the trans to shift prop. monty 07-27-2005, 07:13 PM Check the imput and output speed sensors. They are inexpensive and diffacult to replace. monty 07-27-2005, 07:14 PM sorry I ment not diffacult to replace. | ||