U-joint part #'s

[boxboy]

So I put new u-joints in my 1968 520 when I first got my truck. The originals were dry as a bone and vibrating. New ones at NAPA had c clips that were a little fat, so I sanded one side of each clip just a fuzz to get them to fit right. Now, maybe 150 to 200 miles later I have a vibration again. Checked and I have a rear u-joint that has obviously thrown grease and is sloppy cap to cap. Anyone have a sure fire part number to make sure I have the right joint, and any ideas why I have this problem so soon after replacing them? I mean, u-joints aren't brain surgery.

[datzenmike]

You shouldn't have to sand the C clips. This may have caused the problem.

 

The replacement kit from Nissan is Pt. # 37125 14627

 

They are about $65 so forget that! Use the pt. number to cross reference something from NAPA. Make sure the yoke isn't damaged and the U joint fits properly.

[boxboy]

I didn't think I should have to either, but I couldn't get them in otherwise. Anyway, I looked at "CarParts Manual" and they show snap rings that go on the outside of the cap. What I took off and put on had the c clips on the inside of the cap. Not sure why the discrepancy there. I will see what NAPA has with this number. I suppose I just ate the $25 bucks I paid for the first one. Ouch!

[boxboy]

You were part right Mike. I only sanded one a little too much. Took the DL off and found the joint itself to be fine. But the c clip on the problem joint got sanded a bit at an angle. (Must have been the first one I did) Anyway, NAPA doesn't have any spares. They will more than happily sell me a whole new u-joint though. Anyone out there have any old c-clips from a Napa #391 U-joint they wouldn't mind putting in the mail for me?

[shancerlelby]

sounds fishy, maybe you got the wrong ones? I'm doing them in my 521 right now and they are precision brand number 391 p#1092266-R. Are there 3 on the 520? im not familiar with them but my truck has one at the trans, then heads to a steady bearing then another u joint then heads to the rear diff where theres a 3rd. Hows the rubber in your steady bearing? i hear they like to dry rot and rumble more than they should.

[boxboy]

The 520 has a one piece driveline. No need for a carrier bearing. I am using the same u-joints. The #391's. I just need a new c clip or two. Again, if anyone has one from this size of u-joint, I would be grateful if they would be willing to stick it in the mail.