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View Full Version : Vibration noise on decelaeratio and downhill in drive coming from rear end.


Bathgate
July 10th, 2010, 11:09
My son broke the rear yoke and u-joint dropshifting. We replaced the yoke and the seal at the t-cAse output (it broke too) and put a new u-joint. Now "Vibration noise on decelaeratio and downhill in drive coming from rear end. " he's 18 and I was involved in everything exept the u-joint. He did that while I was at work. It's stock and never did this before. The noise sounds like what some older cars sounded like in reverse.

joe_peters
July 10th, 2010, 11:34
Possible wear/damage to the rear axle's pinion bearings.

Shorty
July 10th, 2010, 11:46
maybe one of the needles fell over/out from the u-joint? If he managed to get it together like that, it'd make some hellacious vibes-- possibly more-so on deceleration??

joe_peters
July 10th, 2010, 12:12
maybe one of the needles fell over/out from the u-joint? If he managed to get it together like that, it'd make some hellacious vibes-- possibly more-so on deceleration??

Good point, although I'm not sure he could have gotten the cap on enough to button things up with a needle laying over. Of course YOUTH and a BFH can accomplish many things. If that happened, wouldn't the problem exist on acceleration as well as coast?

Bathgate
July 10th, 2010, 12:16
Is there a diagnostic procedure. The u-joints look dry and rusty already but he says that he fully greased them. Maybe I should see if it's hot after a drive?

Shorty
July 10th, 2010, 12:22
Good point, although I'm not sure he could have gotten the cap on enough to button things up with a needle laying over. Of course YOUTH and a BFH can accomplish many things. If that happened, wouldn't the problem exist on acceleration as well as coast?

in theory, you'd have vibes both directions, but it may be amplified by the change in direction-- just a thought.

I'd think the two caps pressed into the shaft would be tough to fit with the needle in there, but the two bolt on ends at the yolk (rear joint) might fit if the needle were stuck in the grease channels of the cross-- still just a thought....

joe_peters
July 10th, 2010, 12:38
Yeah, it definitely could happen--NOT THAT I EVER DROPPED A NEEDLE AND STUBBORNLY TRIED TO FORCE IT TOGETHER! :anon: