2005 chevy silverado 4x4 w/t. When I put it in 4x4 drive it makes a bad wineing noise, mostly when I let off the gas and slow down. 4x4 seems to be working fine but also when you hit the brakes in the snow it's like the front end jumps out of gear and makes a real bad clicking noise. What could the problem be?
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This sounds like the front drive shaft that may have worn u joints. Put the vehicle in park, set the brake and proceed to shake the front drive shaft up and down to inspect for wear. Let me know what you find.
WELL IF YOU CHANGE THE REAREND THAT DONT HAVE NOTHING TO DO W/PUTTING IT 4 WHEEL DRIVE BECAUSE ITS THE FRONT ONE THAT LOCKS IN . MAYBE YOU BRAKES ARE DRAGGING ON THE REAR END ADJUST BRAKES AN SEE IF THAT HELPS .
Jack up the rear wheels and put it on jack stands. Have someone get in it and put it in 4wd and drive. Release the brake. Rear wheels are spinning only right. Don't get under it but look under it and see if the front driveshaft is spinning. If the shaft is spinning but the wheels aren't it is likely a bad front axle actuator. If the front shaft isn't spinning it is a transfercase problem.
It does not seem that sufficient diagnosis was done. No, you cant give a specific diagnosis like that without tearing unit down. It's likely that they told you the most common failure and left it at that. Likely there is a problem with your unit...I think this becomes more of a trust issue than a mechanical one. A second opinion from an independent reputable shop may help but either way, you need to have it fixed. In not using it much, it makes me wonder how it got worn. good luck