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48re throttle valve actuator | Cummins Diesel Forum My tranny has been shifting erratic and slips from 2-3 and 3-4 lately I noticed today with the key on but not started the trucks transmission throttle valve actuator (TTVA) is making a buzzing whining noise under the truck Could this be my problem Is it going out What does it do? And I looked
05 48RE governor psi low? | Cummins Diesel Forum TVA was replaced about a year ago seems to work but If I remember before I replaced this, trans was fine other then a code for the tva so I replaced It did the 30 sec program for It