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Grinding, clunking between shifts, no 4x4
Noises from transfer case
Bad performance; pingging noise in motor are symptoms of bad gas in a vehicle.
It is important to know the symptoms of a bad car part. The symptoms of a bad motor or transmission mounts are loss the car part, shaking and lots of noise.
! This is called a Transfer Case Encoder Motor or a Transfer Case Shift Motor. If the motor itself is bad it will not engage and disengage the clutch to send power to the front differential. If is is corroded it will many times stick and blow the 20 amp fuse located in the engine compartment fuse box.
A 1996 Tahoe should not have auto hubs, it should have a shift motor on the transfer case that engages it there and another vacuum operated one on the axle shaft on the passenger side. They are notorious for the shift motor on the transfer case going bad, it is a push button 4wd system and should set a code that tells you what is wrong.
If it's not the manual type, then the electric motor on the transfer case is either bad or not getting power. If you really need to drive this vehicle until you can get it fixed right, you can take the electric motor off the transfer case and use a wrench to manually disengage the four wheel drive.
Bad u joint Transfer case was out of fluid,
Most four-wheel-drive vehicles are controlled by the transfer case. The transfer case has many years in it. A bad year in the transfer case will cause the vehicle not to engage.
Low power or no start.
When you have a bad motor mount you may feel a thud when you try to change the gears of your car. You may also find that your motor moves a little because it isn't secured to the car properly.
Either the sensor is bad or the shift motor in/on the transfer case is not working for some reason (failed, blown fuse. etc.)