It's BAAAACK(i think)

[Brian 89 325i]

Ok some of the members might remember that i had a bad rear end vibration a while back, so i threw a few things at it and finally when i was putting in my new diff i noticed the rear U joint was super notchy. SO i got a rebuilt driveshaft from MESA performance and all is well (for 6 months-ish) BUT now at about 55-65 mph im getting the same vibration. Could it be the driveshaft again? If so why would it go bad so fast so i can fix that too, if not what could it be?
Details: No steering vibration, no shifter vibration, no abnormally worn tires, feels like its coming from the right rear of my seat, and when i place my hand on the console at 60ish it feels like it belongs in a sex shop.

Help please.
Brian

[Pedro]

Let me call my dad tomorrow and talk with him about it, we had the same problem with my e28. ill reply tomorrow to see if i can find out exaclty what it was.

[m42technic]

Did you do the guibo and center support bearing when you replaced the driveshaft?

[Brian 89 325i]

Did you do the guibo and center support bearing when you replaced the driveshaft

Yeah, the replacement shaft came with a new CSB and i did the guibo a month or two before.

Brian

[grlaneriejr]

This may sound like a stupid suggestion, but try rotating and balancing your tires. Out of balance tires show up vibration wise at about 55-65 mph.

Especially if the only place you feel your vibration is in the steering wheel.

[elemental]

Are the U Joints replacable on our cars? I think I have hurd that they are not replaceable. What is up with that!

[m42technic]

This may sound like a stupid suggestion, but try rotating and balancing your tires. Out of balance tires show up vibration wise at about 55-65 mph.

Especially if the only place you feel your vibration is in the steering wheel.

He said he didnt feel any vibration in the steering wheel.

[Pedro]

I called my dad and he couldnt find the reciept fromt th shop, but i do remember them saying the driveshaft would need to be replaced and the u-joints got replaced. Sorry cant be more help

[Brian 89 325i]

Well thats the problem, ive just replaced the driveshaft like 4-6 months ago. What could cause the new one to fail so quickly (aside from defects). Maybe im being hypersensitive. Ill recheck my tires on monday. My next large project is to get new trans mounts, replace my subframe bushings and rear trailing arm bushings along with new sway bars and links. while im down there ill check out my u-joints, output bearing, and inputbearings. while rebuilding my shift linkage and installing a SSK. Until it gest worse ill just live with it.

Brian