Hi all, Hoping one of the drivetrain guru's out there has an idea about this issue. 96 2500 burb with 6.5 TD, 4L80e tranny and servo actuated 243 t-case. When I am in low speed, starting from stop and asking the engine for power, the tcase is randomly trying (I believe) to go into 4wd hi. The control switch panel does not indicate any activity, no flashing, just the normal 2Hi indicator illuminated. The racket from under the belly of the truck is horrible. I changed all the fluids, t-case, trans, and front axle. If I place it in 4wd, this issue never happens. if I am super gentle pulling out, it may happen, just not as severe. does not happen at cruise speed.
Disconnected the front driveshaft and put a zip-tie around un-coupled yoke at t-case and front axle. Test drove. THe zip-tie on the t-case broke when I accelerated like normal. I could here it switching, but no racket and shuttering horrible sound through the truck like when the driveshaft was connected.
My question is, does this soudn like the servo going out (again?) last time, it would just flash the lights on the dash control unit. I don't want to kill the t-case, so I am not driving it. Was thinking pick-n-pull to get a cheap servo and try it out. any thoughts anyone? THanks!!
Neo