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Brand New Driveshaft U-joint - Tight. Vibration 200 1990

posted by  mtd240 on  Tue Aug 27 09:48 CST 2013
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last visit: Fri Oct 24 09:25 CST 2014
[RELATED]

I pulled the diff plug when the driveshaft was out, and fluid dribbled out - definitely full.

Trans fluid level is fine. I pumped a little bit of grease into the center support bearing with a needle fitting after I did the work yesterday.

Regardless - this bass noise wasn't there before I replaced the u-joint. So either:

1. U-joint was bad out of the box
2. U-joint was installed incorrectly
3. A tight, new u-joint revealed another problem in the driveline (old joint had play)

#1 is not likely - all needles were present, and it spun smoothly.
#2 has been the current topic of discussion/research - I seem to have fixed that.
So that leaves #3..

Checked:

Diff fluid level (yesterday). Fluid is new from 6 months ago (Amsoil)
Trans fluid level (yesterday). Fluid is new OEM from 6 months ago.
Guibo (yesterday) is new from ~6 months ago
Front u-joint - no play. smooth.
Trans mount - replaced with proparts 5k miles ago. Pretty soft..but intact

I guess that leaves the center support bearing. The rubber surround piece is getting pretty cracked - but the bearing is SKF, replaced 1.5 years (30,000 mi) ago. I guess it could be time again..

Thanks everyone for the responses. Sorry if my replies are long and "stream-of-consciousness" - I am trying to be as informative and thorough as possible.






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