I have a 99 F150, 5.4 with 4 wheel drive. When i turn to the right i get a clunk or a pop in what seems to be the rear. Also when i go over bumps it seems a little clunky. I have talked to a guy at Auto Value and have looked online. I don't know what to do. I don't want to waste money. Here are a few options i came across to do:

Replace rear shocks

Pull the driveshaft and grease the splines

Replace u-joints

Rear end issues?


I have checked the u bolts that are in the rear and they are tight. I grabbed the rear shocks and i can turn them side to side a little. The shocks have been on the truck since 06 and 75,000 miles. I don't know if the u-joints have ever been changed. How do you tell if the u-joints are bad? It does not clunk when i put it into drive or reverse. I grab the driveshaft and can not feel any movement. Please help me out. I don't want to waste money on replacing stuff if i don't need to...

 

best way to check u-joints is to have the truck in neutral and check for play. Willing to bet its either u-joints or slip yoke. Simple fix for slip yoke is to put leaf spring clamps ~6" in front of the axle.

 

How can you tell if it is the slip yolk?

 

Check your spring leaf in the rear where it attaches to the frame... Mine blew out as made similar sounds. Worth checking it out