I gotta tear into it, but I figure if someone has dealt with this before it would be easier. 1998 K2500 5 speed 4 wheel drive. Driving down the road, It will randomly start whining, its very loud. Once the whining start it doesnt matter what gear I shift into, clutch in and out, whatever the whine is constant. The faster I got the louder it whines, the slower I go the lower it whines. The only thing that will make it stop whining is to hit the brakes and slow down enough that it starts. I can than continue on my way, no more whining. Any clue what that could be ? I was thinking caliper holding up, but not sure if that makes any sense.