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post #1 of (permalink) Old 04-09-2001, 03:42 PM Thread Starter
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Front Driveshaft U-joint Question

This may have been covered before... or maybe not.

This is an observation as well as a question.

I'm running a 4.5 SPOA with 1" longer shackles up front and 2 " longer in the rear. The front pack consists of the main leaf, a rear leaf, and 2 CJ leafs. Total lift is about 6".

I'm using a Hardcore 4x4 skidplate and the other day I noticed that I needed to "notch" the skidplate a little more in order for the front driveshaft not to hit it at full drop. So this morning I dropped the skidplate and grinded the notch deeper. I used my high-lift jack to pick up the front end because I wanted to make sure I had cut enough metal away and the driveshaft would now clear the skidplate. While I was checking clearance for the skidplate I also checked clearance at the crossmember. With the axle at full drop the d-shaft is close to the crossmember but not hitting.

Now for the problem......
I spun the front driveshaft and the angle is so steap that the u-joint binds just a little as I spin the shaft. It doesn't bind enough that I can't turn it, but I can feel and see the joint binding as I turn it. Remember I'm only running 4.5 inch pads and 1" longer shackles. What are the guys doing who run drop shackles? What about people running 5.5 pads or 2"longer shackles?

I guess I could remove the joint and do some grinding to make clearance? I'm not that concerned with mine because it wasn't binding that bad. But all of you that are running 5.5 pads or drop shackles need to test your front d-shafts for binding at the t-case u-joint.



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post #2 of (permalink) Old 04-09-2001, 08:16 PM
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Re: Front Driveshaft U-joint Question

Thanks Jbird,i need to check that,RR

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post #3 of (permalink) Old 04-09-2001, 09:37 PM
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Re: Front Driveshaft U-joint Question

Jbird, I also run the 4.5 inch pads but with breeze 5 inch drop links and stock springs. I decided to check after reading your post. I have not had any problems that I knew of but wanted to be sure.

I jacked it up till both tires were off the ground and the DLS were fully expanded. No bind in the u-joint. So I lifted one side at a time and still no bind. The only bind I was getting was from the z-link and leaf spring.

My shocks are a limiting factor in my droop. I have DT 3000 with a 17.5 inch in to a 28 inch out.

What kind a shocks and springs are you running? Maybe thats it?

I attached a pic of the droop on mine.

John
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post #4 of (permalink) Old 04-09-2001, 10:01 PM Thread Starter
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Re: Front Driveshaft U-joint Question

My front springs are stock length. I'm running stock upper shock mounts with breeze lower shock mounts. My shocks are 14 compressed and 24 extended. The shocks do not limit drop, there is about a 1/2 inch left of shock at full drop.

Maybe there is a difference in the years. I see you have a 87 and mine's an 88.5.

Does your t-case sit level or is the back lower like mine?


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post #5 of (permalink) Old 04-10-2001, 07:18 PM
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Re: Front Driveshaft U-joint Question

Hard to tell, but the back is lower on mine too. Could it be a bent yoke or dented seal cover on the flange maybe?

John
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post #6 of (permalink) Old 04-11-2001, 12:17 PM
 
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Re: Front Driveshaft U-joint Question

It also bends on mine..
have mostly the same setup..
the U joints even have marks that they have had contact..
thanks for pointing out a future problem..
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post #7 of (permalink) Old 04-12-2001, 01:32 PM Thread Starter
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Update on Front Driveshaft U-joint Question

Do you think Samurai's have a mind of there own?

I went to Carolina Beach, NC yesterday and have discovered I have a bad vibration. Guess where? The front d-shaft! I guess my Zuk knows I was talking about it.

The wierd thing is I was just wheeling about 2 weeks ago and didn't have any problems. But yesterday while in 4 wheel drive (low or high) I have a bad vibration coming from the front driveshaft. It only does it when under a load. I had the hubs locked in and was driving 55 down the road with no vibration. But in the deep sand at the beach.... I thought my dash was going to vibrate off.

I'll be taking a good look at my u-joint before I head to Zuwharrie!

Also.... what does it mean when your t-case pops out of 4high? Didn't have any problems with 4low. This might have something to do with the vibration?

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post #8 of (permalink) Old 04-12-2001, 04:50 PM
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Re: Update on Front Driveshaft U-joint Question

Hmm check your t-case mounts, they may be twisted.
When mine was popping out it was bent stock arms.
Also check the rubber mounts.

Glenn
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Lockers, 8klb winch, -Wildweasel2 NE4WI- club http://www.cs.umass.edu/~glenn/personal.html
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