Mechanics

CHEVY 4 WHEEL DRIVE PROBLEMS

1994 Chevrolet Silverado

Shakes or Wobbles problem
1994 Chevy Silverado 6 cyl Four Wheel Drive Automatic 186000 miles

when I put this truck in 4 wheel high and get to 40 mph or higher there is a growling noise and the front wheels throw the truck 6 to8 inches to either side constantly. The ball joints, tierods and other sterring parts check out good. The cv joints seem to be good. Cant figure this one out.
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Hd2007
September 14, 2009.



Growling noises at speeds in excess of 35mph is usualy wheel bearings, check them quik! Spindle damage can occur if untreated! Look for metal " flaking" on the bearings if present, that's your problem. If none, then remove the Differential cover and look in there, there are carrier bearings and inner axle bearings at the front of the tubes.

Merlin2021
Sep 14, 2009.
The 1994 silverado does not have spindles it has bearing hubs and the diff. Does not have a cover. It has 2 havles and is bolted to the frame. It drives fine with no noise in 2 wheel drive. The growling and wandering only happens in 4 wheel drive. It also has an electrical part that connects the front axles in 4 wheel drive. Thanks

Tiny
Hd2007
Sep 14, 2009.
OK my error! It could be the carrier brearings, the fron Diif only spins in 4X4. Or the pinon bearing. BTW how are the bushings that hold it in place?


http://www.2carpros.com/forum/automotive_pictures/62217_k1500a_2.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_k1500b_2.jpg


Merlin2021
Sep 14, 2009.
I had a similar problem with an S-10 blazer once. I would get a growling or grinding noise from the front axle when I put it into 4-high. What the problem was, is that the shift fork (Part #16 in the diagram above) was worn as if someone had " machined" a groove into the fork. It was caused by excessive wear while the shift fork was riding/pulling against the the sleeve (part #22) to engage the the 4x4 system. It is a fairly straight forward repair, even though you have to seperate the axle tube from the front differential (The axle doesn't have to come all the way off. You just have to move it out of the way to pull out the old shift fork and install the new one.)

Tiny
Quagmire86
Sep 14, 2009.