My 1996 GMC Sierra 4x4 in 2 whell drive backing up the rear right wheel locks up I can drive foward then back up but it keeps locking up at different times. I had my transmision repaired last year complete overhaul Could it be the diff or transmision is there a quick test I can do Mike

SOURCE: 1990 GMC Sierra 4x4 1500

the connections near the front axle that activate the motor to engage the system aren't melted? That's a comon problem for that body style. If there good, sounds like it could be that motor itself. To figure out if it's you motor or transfercase, jack up the rear end, have a friend inside shift into 4 wheel drive, or try to, and put it in gear and apply some gas. If the front driveshaft is turning then it's something with the front end. If not, farther back in the system.

SOURCE: 2002 GMC Sierra 1500 rear brakes

Hi joelalthomas, if they replaced your brakes and you never even made it home they had better warranty the work and as for the "it was a common problem on 2002-2004 trucks" well check for Chevy recalls as this is a safety issue that would have been corrected at no expense to the vehicle owner, do a little more research my friend and let me know what happens, I will check around a little as well in the meantime I would find a new garage.Do not pay any more as you said your brakes worked fine until they worked on it good luck to you As for your 4x4 did you look at the left side when you did the right side? and were they bled off properly? you can visually check to see if the calipers are functioning

SOURCE: right rear wheel

have a 1996 Neon with the same problem I am currently working on. It did the same thing to me 6 months ago. At that time I changed the brake shoes and the wheel cylinder. Now the problem is back. Pads are still good. I think the problem may be a combination of 2 things. A large lip on the inboard side of the drum and the drum is out of round. The lip is bumping the pads enough to allow the pads to catch and jamb as the smaller diameter of the drum comes around. There is also one area on the inside of the drum that you can see has been hot and left a heat discoloration or scorch mark about 4 inches long. I will see if the drum can be turned. If not I will just replace it. This problem only occurs on wet or slippery pavement at slow speeds. At fast speeds it creates the scorch mark on the inside of the drum.

SOURCE: right rear wheel locking up

okay you had brake work done!!! "THINKING" that was the problem originally right rear wheel locking up! okay,,, so doing brakes has not solved your problem! I would maybe look into rear end bearing??? do you have any load road noise from rear and do you have rear end fluid in differential? question to you was the baking plate ""WET"" looked damp? or moister get at it!??? seal might have leaked all fluid out??? all the above would be good place to start! good luck I hope this info helps you out.Happy new year.

Wade Cook

• 6 Answers
• Posted on Jan 27, 2009

SOURCE: 4X4 inop on 2003 GMC Sierra 2500HD

I have found that when you are going to engauge 4x4 high, it is best to only be going about 3 miles an hour. Not faster, not stopped. It likes some movement to help it mesh. I've had perfect shifts since I started this. Hope it helps. Wade.