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Unread 05-24-2006, 01:21 PM   #1
DirtyDog
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1988 YJ Wrangler 
 
Join Date: Nov 2005
Location: SE Oklahoma, Oklahoma
Posts: 103
U Joint Replacement

Anybody know of a good write-up on replacing U Joints? I am getting alot of rattling under my 88 YJ and from all I've read on the forums, it seems that the U-joint is the culprit. Also, can anybody tell me how much mechanical ability one would need to change a U-Joint, and what tools would be required? I checked with the mechanic and he told me the would charge around 100-150 dollars, so if possible I would like to do the work myself and save some money. I have a Chilton's manual but the write up in there seemed to require prior knowledge of U-joint replacement to get started. Thanks for the help.

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Unread 05-24-2006, 01:22 PM   #2
TellyDSP
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1995 YJ Wrangler 
 
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On the axles or driveshafts? The process is similar, but the axles are a bigger PITA.

Here's a writeup. Since I dont have a vise, I used a BFH to smack the small socket.

http://www.popularmechanics.com/auto...n/1272541.html

on the axles, you'll have to first removes them from the tubes. I know there's a writeup somewhere, but my boss is coming.
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Unread 05-24-2006, 01:32 PM   #3
92 Green YJ
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its fairly simple really, especially on the driveshaft. for tools you need a 7mm (as i recall) socket to remove the four bolts that are on the u-joint straps on the rear yoke. then slide the driveshaft out (Im assuming a stock driveshaft). now you need a pair of needle nose pliers to remove the retaining clips that hold the caps in place. there are two on the axle end, and four on the t-case end. Now, to remove the joints from the shaft, the best thing is a u-joint tool. it looks like a bog c-clamp, harbor freight has them for about 35 bucks. if you dont have that, a BFH and a punch can be used for removal. you need to pound the joint through enough to remove one of the bearing caps, then pound it the other way and pull the other cap, then the u-joint should come right out.

to re-install the new ones, pull the caps off, minding the needle bearings stay in place. slide the caps in as far as you can, put the u-joint in, then use a shop vice to press the caps in, make sure you dont knock the needle bearings out of place. then use the u-joint tool to press them in the rest of the way. use a needle nose to install the new retaining clips, and you are done. grease em up and put the shaft back in.

your Haynes manual should detail this procedure as well
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Unread 05-24-2006, 07:34 PM   #4
DirtyDog
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1988 YJ Wrangler 
 
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Location: SE Oklahoma, Oklahoma
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I am pretty sure its on the drive shaft, as most of the clanking and rattling seems to be coming from under the jeep behind the front seats. I got under the Jeep a while ago and checked it out, but I really don't know if there is a way to check and see if if the U joints are really whats damaged. Any ideas on how I could check this? Thanks for the responses so far.
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Unread 05-24-2006, 07:54 PM   #5
Johnny World
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2002 WJ 
 
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Quote:
Originally Posted by DirtyDog
I am pretty sure its on the drive shaft, as most of the clanking and rattling seems to be coming from under the jeep behind the front seats. I got under the Jeep a while ago and checked it out, but I really don't know if there is a way to check and see if if the U joints are really whats damaged. Any ideas on how I could check this? Thanks for the responses so far.
Here you go. I had the same problem and got good answers.
http://www.jeepforum.com/forum/f12/look-what-i-discovered-today-pics-clips-269248/

And as for not knowing how to change a u-joint, don't worry, I didn't even know what a u-joint was. but reparing it myself was probably the smoothest repair i've done on my YJ to date.

I used this write up to install my new u-joints.
http://www.pirate4x4.com/tech/ujoint_install/

oh yeah, if your replacing one u-joint, might as well replace the other. (rear driveshaft has 2).
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Unread 05-24-2006, 08:57 PM   #6
ragtopkid
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Front has 2 u loints also, real easy to do with my 20 ton shop press, but I have done the socket/ BFH route and big vise route also. I am just at that point in my life that I can afford the correct tools to do the job as easy as possible.
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Unread 05-24-2006, 10:50 PM   #7
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