Q: How do you remove and install a TR switch on Chevrolet Avalanche,Silverado,Suburban,Tahoe,GMC Sierra,Yukon,Yukon Denali and Yukon XL?
A: First, put the shift lever in NEUTRAL and apply the parking brake before removing the Automatic Transmission Shift Position Sensor Switch. The vehicle can then be raised and stands placed securely under it. By sliding out the retainer, pulling off and releasing the connector, disconnecting it from the automatic transmission shift position sensor switch followed by removal of its retainer lock and electrical connector. Pry out the pin to release the manual lever from shift cable. After that, remove manual lever nut plus manual lever itself. Finally, there is a need to take-off mounting bolts of Automatic Transmission Shift Position Sensor Switch as well as switch itself. If fitting a new switch, align slots in switch with notch on switch body and locate it over shafts. However align flats of shift shaft with those of Automatic Transmission Shift Position Sensor Switch if reinstalling old unit. Ensure that it starts only PARK and NEUTRAL after installation by testing for engine start elsewhere in case readjustment has to be done by slightly turning mounting screws in one direction or another until starting occurs only at PARK and NEUTRAL positions whereafter tightening mounting screws firmly.