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Unread 10-13-2008, 09:54 AM   #1
Eggdashure
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1999 XJ Cherokee 
 
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Location: Grand Junction, CO
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SYE on...still got the vibes!

Hey all,

Ok, I finally got some time to roll under my Cherokee and get down to installing my RE HnT. Just some specs 99 Cherokee, 4.0L, NV242, 8.25 in the rear with a 4 degree shim. I set everything up so that I could use the driveshaft off the front of another XJ.

So I got it all bolted up, and couldn't wait to go for a test drive. Driving around in FWD was getting old, too much babying. I could tell immediately that things were better, with the stock DS I had vibes starting at 15MPH. But when I hit 35MPH I couldn't feel any vibrations, but I could hear them. Does that make any sense? Also, I noticed that when I let off of the accelerator, the vibrations went away, as soon as I gave in some juice they were back.

Any help appreciated.

Matt

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Unread 10-13-2008, 10:08 AM   #2
peleejosh
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How are the ujoints on the driveshaft that you used?

Quote:
Originally Posted by Eggdashure View Post
Hey all,

Ok, I finally got some time to roll under my Cherokee and get down to installing my RE HnT. Just some specs 99 Cherokee, 4.0L, NV242, 8.25 in the rear with a 4 degree shim. I set everything up so that I could use the driveshaft off the front of another XJ.

So I got it all bolted up, and couldn't wait to go for a test drive. Driving around in FWD was getting old, too much babying. I could tell immediately that things were better, with the stock DS I had vibes starting at 15MPH. But when I hit 35MPH I couldn't feel any vibrations, but I could hear them. Does that make any sense? Also, I noticed that when I let off of the accelerator, the vibrations went away, as soon as I gave in some juice they were back.

Any help appreciated.

Matt
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Unread 10-13-2008, 10:58 AM   #3
Jason, aka: Jeepin.com
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How much lift are you running? "home brew" doesn't tell us how tall it is.

Check to make sure there's no slop in the yoke on the "new" rear driveshaft.
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'95 XJ, RE 5.5", 35" MT/Rs, D30 w/hubs & ARB, D44 w/Detroit, 4.56s, C4x4 bumpers, etc, etc.
'00 TJ, SOLD, wife's, RE 4.5" long-arm, 35" MT/Rs, D30+OX, D44+ARB, 4.88s, full cage, winch, C4x4 & Jeeperman bumpers, etc, etc.


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Unread 10-13-2008, 11:01 AM   #4
sjbond67
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maybe too much shim?
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Unread 10-13-2008, 11:02 AM   #5
bikedude189
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yeah, check all u joints and pinion angles...
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Unread 10-13-2008, 11:13 AM   #6
champelite210
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Was your drive shaft shortend by a driveline shop or in the back yard. Possible it didn't get welded on straight.
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Unread 10-13-2008, 11:40 AM   #7
peleejosh
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Quote:
Originally Posted by champelite210 View Post
Was your drive shaft shortend by a driveline shop or in the back yard. Possible it didn't get welded on straight.

When did he say that he shortened the driveshaft?
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Unread 10-13-2008, 12:52 PM   #8
Eggdashure
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U-Joints: Brand new on what is now the rear of the shaft. In the Cardan, they weren't that old so I re-used them. I was told only about 10K on the joints.

The shaft: Remains at stock length, according to this post, I didn't need to mess with it.

Lift: If I'm measuring properly (center of the hub to the bottom of the fender) I'm sitting at 21" front and back or about 3.5 up front 4 in the rear.

Thanks!
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Unread 10-14-2008, 09:30 AM   #9
Eggdashure
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Any ideas guys? So far looks like 2 votes U-joints. 1 vote, shims/pinion angle.

Thanks!
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Unread 10-14-2008, 12:26 PM   #10
Highway 4x4
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Remove your front DS and check for vibes again.
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Unread 10-14-2008, 01:02 PM   #11
Redrum8675
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when u take ur front DS out and there are no vibes....wat could be causing it then?....bad u-joint?...cause thats wat happening to me
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Unread 10-14-2008, 01:11 PM   #12
Jason, aka: Jeepin.com
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More than likely, in my experience anyway, that means the yoke and/or splines on the driveshaft slipyoke is worn out. Grab the yoke with your hand and see if you can wiggle side to side relative to the rest of the driveshaft (this is easier to do and see with the shaft installed on the vehicle). If this is the case, you can try replacing just the yoke, but my guess is the whole driveshaft will need to be replaced due to the splines being worn. Though I guess you could also price out having a driveline shop cut off the old slipyoke assembly and weld on a new one.

Also, the word "what" has an "h" in it. Unles ur txtng frm ur fon, or missing fingrz, or r a Chick-fil-A cow, thrz no rzn to mspel wrds... when typing on a full QWERTY keyboard. I can't imagine the hell English teachers in schools must be going through nowadays... Do they even still teach typing in jr high/middle school?
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'09 JKUR, RE 3.5", 37" GY MT/R-Ks, Expedition One bumpers, T&T rockers & skids, XRC10 Comp
'95 XJ, RE 5.5", 35" MT/Rs, D30 w/hubs & ARB, D44 w/Detroit, 4.56s, C4x4 bumpers, etc, etc.
'00 TJ, SOLD, wife's, RE 4.5" long-arm, 35" MT/Rs, D30+OX, D44+ARB, 4.88s, full cage, winch, C4x4 & Jeeperman bumpers, etc, etc.


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Unread 10-14-2008, 01:33 PM   #13
100dollarbill
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Quote:
Originally Posted by Jason, aka: Jeepin.com View Post
Also, the word "what" has an "h" in it. Unles ur txtng frm ur fon, or missing fingrz, or r a Chick-fil-A cow, thrz no rzn to mspel wrds... when typing on a full QWERTY keyboard. I can't imagine the hell English teachers in schools must be going through nowadays... Do they even still teach typing in jr high/middle school?
Go get 'em Jason!!! It's hard enough figuring out what peolpe are saying when they CAN spell!
There should be some kind of test you have to take before you are allowed to post. Mods??? Anyone???
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I also have this strange jerk at the steering wheel
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Unread 10-14-2008, 02:20 PM   #14
TheNerd
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Quote:
Originally Posted by sjbond67 View Post
maybe too much shim?
This is my vote...
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Unread 10-14-2008, 02:25 PM   #15
Eggdashure
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Hookt en Fonix Werk'd fer mi!!!

Quote:
Remove your front DS and check for vibes again.
So pull the rear shaft off again and see if it vibes now? Do I pull my whole RE assembly as well?

Something I noticed that makes me believe more in the pinion angle. I loaded the rear of my Jeep with two heavy duty copiers (work stuff ) and drove them back to the office. The vibrations seemed less pronounced with the added weight.
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