Speedtoys

Ive had a power-on vibration in my driveline for some time.

Yesterday I finished replacing the last moving items in my whole drivetrain trying to isolate it..rear wheel bearings.

When I put it all back together, I changed one other thing, I moved the L/R half shafts to the other side.

Going forward my car is gass smooth at any speed, which is pleasant, but under decel the grumble came back...and telling which side a vibration is on is sometimes hit and miss, before it seemed for sure on the drivers side, and now it seems for sure on the pass side.

So..thats why I ask, can a CV go bad in just one direction?

They have both been replaced in the last 3yrs, one I did with my kid at her school, the second one GB did a year ago.

Shark2626

Easiest way to confirm that they are interchangeable is to refer to their part numbers, if they are the same then you can rule it out.

What else did you do while you were at it?

GregBBRD

C/V joints go bad from lack of lubrication and mileage. They are essentially a ball bearing that can move in multiple directions. The ball bearings transfer the loads from one of the two "curved" bearing races, as well as the cages that hold them captive. This results in wear, which always occurs on the "loaded" side.

The answer to your question:

Absolutely YES.

Speedtoys

Well, the front clamp is new, with the C clip as it should be Feb2020, a new 500M GB driveshaft Feb2020 (mine was bent JUST at the front 4" at the splines..have a theory, but its a dirty one), new 928intl TT bearings and damper supports Feb2020 , trans was GB fully rebuilt, LSD was GB fuilly rebuilt both April 2018...still had on-throttle vibration.

Has new Porsche motor mounts (2011), and trans mounts (2018).

So this week was new wheel bearings, and swapped left/right halfshaft locations...THAT is what moved the vibration from side to side, and from Accel, to Decel loads.

FWIW, the rear bearings were OK, but the new ones are tighter..so..it was coming anyways.

Speedtoys

Welp, it would appear that the one that was on the Drivers side...now on the Pass side, needs replaced, again.

GregBBRD

I've had excellent results with the rebuilts that 928 International sells.
I'm pretty sure the joints actually get rebuilt....not just new grease stuffed over the top of old grease, with a new boot.