YJ U Joint help - JeepForum.com

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post #1 of 17 Old 01-17-2014, 06:45 AM Thread Starter
navinke
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YJ U Joint help

I have a 88 YJ that someone put a 4L injected motor in
Front driveshaft U Joints started sqeaking so replaced them, noise came back almost immediately. Channged Joints again...squeak came back.
Took a closer look at the front shaft and put a straight edge on it and looked bent. Tried to find a used front shaft but couldn't (not a YJ shaft, its longer), so had my old shaft rebuilt and balanced.

So My Jeep just has a body lift, new springs and 1 1/2" shackle lift.
Should I drop the transfer case??
OR any other ideas??

Thanks

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post #2 of 17 Old 01-17-2014, 07:07 AM
1320yj
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With a 1 1/2" shackel lift a t/c drop is not needed,body lift makes no difference. If the u-joint failed right after replacement then you probably knocked a roller or two out of place when installing them.I usually clean out the yokes with sandpaper and brake cleaner and lube the caps and press the whole thing together using a C clamp. Some people beat them with a hamer and that is when the rollers get displaced.

1995 2.5 5 Speed SOA +2.5 rough Country lift, High steer kit , 33x12.50 Mud Rovers
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post #3 of 17 Old 01-17-2014, 08:05 AM Thread Starter
navinke
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I hear what you are saying
U Joints were good when installed ( actually done by deiveshaft shop)
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post #4 of 17 Old 01-17-2014, 08:11 AM
Mark05059
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take a picture of the angle of your front shaft and front yoke.. also the transfer case end... maybe there is something there that's not normal

1998 ZJ 5.2 Auto

1989 Wrangler Black Bone Stock 2.5l 5spd
/l , [____],
|---L--[]lllllll[]-
()_) ()_)==O=)_)
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post #5 of 17 Old 01-17-2014, 08:20 AM Thread Starter
navinke
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I will do that after work
I have the stuff to drop the skid plate 3/4" I think I will try that tonight as well
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post #6 of 17 Old 01-17-2014, 10:11 AM
Mark05059
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Quote:
Originally Posted by navinke View Post
I will do that after work
I have the stuff to drop the skid plate 3/4" I think I will try that tonight as well
you don't need to drop the skid plate usually. Lets see what your driveline angles look like before doing something drastic.. (and those bolts for the skid plate don't come out easily without breaking)

1998 ZJ 5.2 Auto

1989 Wrangler Black Bone Stock 2.5l 5spd
/l , [____],
|---L--[]lllllll[]-
()_) ()_)==O=)_)
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post #7 of 17 Old 01-17-2014, 11:05 AM Thread Starter
navinke
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Not the best pics, but looks like one of the caps is moving
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post #8 of 17 Old 01-17-2014, 11:28 AM
teeter02
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there shouldn't be any movement at all, i bet you have got the wrong size u-joint. or worse case you stops are gone on the yoke. take the clamps off and measure the distance between the stops on the yoke and measure the u joint end t end.
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post #9 of 17 Old 01-17-2014, 11:56 AM Thread Starter
navinke
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I will check both
Do jeeps use u joints with different diameter caps from shaft to yoke?
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post #10 of 17 Old 01-18-2014, 07:11 AM Thread Starter
navinke
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Well two caps were loose
Tightened and loctited but started squeaking again
Will have to take apart and measure
How does the driveshaft angle look?
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post #11 of 17 Old 01-18-2014, 07:55 AM
sardog211
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Check your yoke, if everything is tight on your straps and the the u joint slides around the ears on the yoke are worn out, you may just need to replace the yoke. My front yoke was doing this and when I changed the yoke out it cleared everything up. Beats doing a transfer case drop.
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post #12 of 17 Old 01-18-2014, 08:19 AM Thread Starter
navinke
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I have to figure out what year this frankestien drive train is
Can find one casting # of drivers side that starts with "EF" and a short # on passenger side that starts with a 7
I guess time to use google
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post #13 of 17 Old 01-19-2014, 05:57 AM Thread Starter
navinke
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I guess I will have to put it up in a hoist
Can't locate a casting number that relates to any info I can find

How does the front shaft angle look?
Should I drop the transfer case 3/4"?
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post #14 of 17 Old 01-19-2014, 06:40 AM
Mark05059
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Quote:
Originally Posted by navinke View Post
How does the front shaft angle look?
Should I drop the transfer case 3/4"?


The angle of the front shaft looks fine. You need to figure out whats going on with your ujoint caps moving. I believe that is where your squeak is going to be. You DO NOT need to drop your transfer case however in every post I see your asking if you should.. Stop being so fixated on doing something that is not needed. Its actually not an easy job because the bolts that hold the skid in place usually break.

Again, check the yokes on both ends for ears that would center the ujoint in place being missing or warn.

1998 ZJ 5.2 Auto

1989 Wrangler Black Bone Stock 2.5l 5spd
/l , [____],
|---L--[]lllllll[]-
()_) ()_)==O=)_)
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post #15 of 17 Old 01-19-2014, 07:23 AM Thread Starter
navinke
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Hopefully going to a shop today to work on it
Ears are there
Maybe yoke is just worn
Haven't figured what year the drive train is from yet but hopefully will do that today so I can double check that the u joints are correct

I am not fixated on anything just making sure angle is ok
Skid plate has been off lots so not worried about the bolts breaking
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