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  Topic Review (Newest First)
09-22-2013 01:33 PM
LumpyGrits
Quote:
Originally Posted by sean112280 View Post
It was the rear driveshaft u joint
I hope you replaced them both w/Spicer's.
LG
09-22-2013 11:21 AM
JeffreyCharles Just saw this thread and it's sort of after the fact, but I had the exact same set of symptoms and it was the same cause. I dropped the main drive shaft to replace the u-joints and the rear one was completely shot - no roller bearings left in it at all, just rusty metal grinding to pieces. Given the dried-out, rusty state of things it must have been coming apart for awhile, but the symptoms only showed up near the end.
09-22-2013 11:14 AM
sean112280 It was the rear driveshaft u joint
09-16-2013 02:57 PM
Matt1981CJ7 Can we assume you checked everything Lumpy suggested?

Details, man.....

Matt
09-16-2013 02:50 PM
sean112280 Anyone?
09-14-2013 06:45 PM
sean112280 Any ideas?
09-13-2013 06:48 PM
sean112280 Could it be anything with the clutch?
09-13-2013 06:36 PM
LumpyGrits You may have a broken eng or tranny mount.
LG
09-13-2013 04:47 PM
sean112280 So now there is a "clunk" noise when I let off the clutch and shift. It's like there is a delay in the shift too
09-09-2013 07:27 PM
sean112280 I will have to look at that as well. Thanks everyone
09-09-2013 03:31 AM
Patter
Quote:
Originally Posted by Spieg8
Maybe all my drive shafts are wrong, but they all have the yokes parallel to each other (not 90 degrees off). Never had any vibration issues so long as pinion angles are set right.

Here is an illustration I found at this website (mine all look like the second example);
http://jniolon.clubfte.com/driveline...nephasing.html
Yep. Parallel.
Just had one built. Newer slip yokes even have line up arrows stamped in them for that reason.


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09-08-2013 11:10 PM
Spieg8 From what BogusJeep posted above, maybe all my drive shafts are wrong, but they all have the yokes parallel to each other (not 90 degrees off). Never had any vibration issues so long as pinion angles are set right.

Here is an illustration I found at this website (mine all look like the second example);
http://jniolon.clubfte.com/driveline...nephasing.html
09-08-2013 10:11 PM
BagusJeep Ave you taken the slip joint apart and put the shaft back together?

The joints need to work in opposite phases by 90 degrees to cancel out the change in angular velocity on each joint but there are two possible points and they are only balanced at the factory in one, at 90 degrees or 270 degrees. It can go back together in 20 odd different ways but only one is correct.

Look at your joints, are they 90 degrees out of phase? If so are you sure they are not 270 degrees out of phase as it will look identical?

This will cause vibration at speed and more keenly when the suspension is extended and those joints are working harder.
09-08-2013 05:44 PM
sean112280 Thank you for the help. I will be digging into this further.
09-08-2013 03:00 PM
Spieg8
Quote:
Originally Posted by sean112280 View Post
It's a D20 and no it's not always engaged. The driveshaft came straight out of another CJ. Like I said this just started happening. The replacing of the DS was about 3 weeks ago. The shimmy didn't start until this past week
Well there's some detail that was lacking (might list that TC on your profile). Anyhow, like LG stated, u-joints and tire balance would be the normal suspects for vibration. And to answer your earlier questions, 90wt gear oil is normal for a t-18, and the clutch shouldn't be different than normal for your SBC.
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