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u joint's

88chevyk5silverado

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Apr 17, 2010
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Location
Renton Washington
How do u know if u joints are bad? We I come to a stop it feels like my rear end drops down. Hopeing that its just the u joint an no my rear end. Plz advise
 
Set the parking brake and put the trans in neutral and see if there is any play in the u-joints. Rotational movement is ok, up/down, side/side or in/out means something is bad. Watch where the movement is.

If it's a u-joint you'll see it have play.

If the joint is good and you see movement in the yoke the rear end is going.

Otherwise check the u-bolts to make sure they're tight and look for a broken leaf spring.
 
First, always give the specs on the truck, helps eliminate confusion.
For instance, the suggestion I am about to give might not pertain to your truck.

If you have a slip joint in the rear driveshaft, try greasing it. They can bind up and give that kind of effect.
Also, check the u-bolts that hold your rear axle on the springs and the spring hangers.

For the U-joints, chock the wheels, put the truck in neutral, and get under and wiggle the shaft. Twist it back and forth, up/down/sideways. You are looking for slop in the u-joints.
Also, if you see the little cap in the joint has been spinning, its bad.
 

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