Q: Universal Joints

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#1
I'm in the midst of reassembling my E36 after doing heavy upgrades to the rear suspension (Konis, new bushings everywhere, springs, plates, etc.). While I was replacing the center bearing on the drive shaft I thought I should check the UJoints.

When I move them thru the full range of motion, it is *noticeably* easier to move them in the what I would call the operating range, where they rotate slightly as the drive shaft rotates. There is NO loose play at all in any direction, just easier motion. Has anyone noticed this on their car?

Bentley calls out .006 inch (six thousandths) maximum play. That is not much, but still should be noticeable as a slight sloppy movement. I am thinking that what I feel has more to do with bearing polish and maybe thicker lube on the bearings outside of the normal play area.

My gut feeling is that it's OK and I will just move on with the reinstall.

Thoughts?
 
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#2
Well, considering the u-joints aren't replaceable without replacing the whole driveshaft (at least they aren't on the E30), then I wouldn't worry about it until they actually go bad on you.
 
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#3
Same for the E36, at least officially from BMW. There are a few shops in the US that specialize in rebuilding BMW drive shafts.

I am thinking the same as you, if I can't detect any play, just wait until they really fail.
 
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#4
I had one of my ujoints actually go bad on me - one of the bearing caps cracked and all the needle bearings fell out, causing an excessive amount of play in that joint. I couldn't drive the car faster than about 30 mph without an EXCESSIVE amount of vibration, but it was still driveable. I had to buy a rebuilt driveshaft since the ujoints are staked in. They are EXPENSIVE! The good news is that the rebuilt units are remachined so that the ujoints are user-replaceable.

Given the expense of a rebuilt driveshaft, I would just hold off on it. Mine lasted 270,000+ miles before it finally gave it up.
 
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#6
Based on Justin's mileage, I have another 140K miles to go! However, I should probably cut that to 70K due to the extra stress that autocross puts on the joints.
 


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