Highway vibration

[acdame]

Well I have the dreaded vibration my truck. It has 75K on it, and i have check the Wheel bearings, Tie Rod Ends, and Ball Joints.

While prying arround under the vehicle, I did notice that the front differential can move ALOT on the passenger side (where the long nose is). The bushing must be worn out and allowing the diff to shake. I also now notice that the inner CV joints have some odd excess movement as well.

Has anyone noticed this before?

Is there a poly bushing I can buy for that differential mount?

 

[dynamite196]

cv joints are very likely, check the halfshaft free play, also are you sure the tires are balanced?

 

[acdame]

How do you check half shaft free play?

New tires installed/balanced at 72K (31X10.5X15 TOYO OC)

 

[dynamite196]

grab them and try moving them side to side (betweeen the wheel and the differential) should be very very little to no play there if they're good.

 

[acdame]

I can move each one about 1/16 of an inch, and I can hear a knocking sound on the outboard side (by the wheel).

What troubles me is that the inner CV joint on the passenger side kinda "wobbles" in the differential. Is there a bearing in the differential that could need replacing?

 

[dynamite196]

yes there is a bearing, 1/16 should be okay for play but Im guessing the wobbling near the diff is causing the problem