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jandaso 05-21-2013 10:03 AM

Driveline Vibrations!!
So i have a 1997 TJ 4cyl.... Skyjacker 2" spacer lift and 33 inch tires... my axles are D30 front (Locrite locker, yukon 4.88 gears and rear Superior D35 Kit 30 Spline axles with detroit Locker and yukon 4.88 gears) after 50mph the vibrations start and they just get faster and worst if i keep going faster.......

I have read many things but apparently there is 4 solutions so far.....

1. Adjustable Control Arms .... UPPER OR LOWER ???? REAR ??
2. SYE with new Shaft
3. Unbalanced Front Shaft (i will be taking it off to check this out)
4. Bad U joints CV...... The Jeep was completely fine before all of this and pretty much the only things that were swap was the axles ... the DS and Ujoints etc... were there before and they were Fine.

Wish there was a sticky that shows you how to measure the angles and get this thing right once and for all !

DarrenT 05-21-2013 10:47 AM

I'd go with the SYE and CV shaft, there's a sticky at the top with more info. :thumb: or there was..... there's plenty of info if you use the search function.

SuicideSaints 05-21-2013 11:10 AM

There are a couple way to go about this.....

First and the easiest. Check U joints (visually inspect and twist, pull, and push the joints to check for play or damage) There are a bunch of U joints on the jeep, not just the drive shafts but on the axles as well.

Second, check all attach points for condition and security. Make sure all the CAs and bars are tight and they way they should be, make sure all the stuff is tight and not loose.

Third,try removing the front shaft like you said, you can also remove the rear shaft (with the front one re-installed), put it in 4HI and drive it to test if the rear shaft.

Doing this should find the problem, there are stickies and multiple threads if you really get into the search function. Sometimes it just takes a little bit to find the info.

jandaso 05-21-2013 11:49 AM

yeah everything seams tight ... front ujoints on the axles are almost brand new .. going to check the DS tomorrow morning ... and se what the hell is up with this thing.....4wheelparts wants to charge me 95 bucks to diagnostic the problem .

98 tj sport 05-21-2013 02:36 PM

Whats ur pinion angle look like post pics

jandaso 05-21-2013 03:45 PM

Here i have some videos with a driveshaft rotation play .... i think i should be concern

jandaso 05-21-2013 03:46 PM

Bigkidneys 05-21-2013 03:46 PM

Maybe your tires are out of balance? Had vibes around 50mph with mine wwhen I had a 2in lift and upgrading to new shocks and having my front tires re-balanced made it go away.

jandaso 05-21-2013 04:01 PM

Tires were balanced a month ago

jandaso 05-21-2013 04:06 PM

jeepwayoflife 05-21-2013 04:06 PM

Videos are private? Change to unlisted or public :thumb:

jandaso 05-21-2013 04:10 PM

jandaso 05-21-2013 04:16 PM

Videos are now public

jandaso 05-21-2013 06:05 PM

Any thoughts ????

jeepwayoflife 05-21-2013 08:56 PM

That play in the driveshafts seems way too much. I understand them having some play because of backlash in the differential, but that seems excessive. Who installed your gears and how long ago?

jandaso 05-21-2013 09:18 PM

Maybe 3 years ago. Is there anything i can do for that?

Michigunman 05-21-2013 09:38 PM

Is the differential pinion angle parallel to the transfer case pinion? Can't really tell from the pics but almost looks like the diff is pointing down slightly.

SuicideSaints 05-21-2013 09:50 PM

That is way to much play. There should be some slack but not that much in the video.

98 tj sport 05-22-2013 06:07 AM

1 Attachment(s)
Its hard to tell the angle in those pics try to take some perpendicular to everything liike this so we can get a better view

Attachment 252201

And before anyone says anything yes ik the angle is off n that pic. Anyway take a pic like that so we can c better make sure to get the pinion on the diff as well as the output on the transfer case.

As far as the play goes I will say this, when I swapped the d44 into my jeep and regeared everything I had some slop in the shaft, I pulled everything back apart to check it, I could hold the ring gear and the driveshaft would barely move, I could also hold the ring gear and move the tires a good bit before they wouldn't move, the only thing I can figure is that my yukon locker has some slop/play in it, and based off of a video I watched from yukon on how the locker is made/works it is designed that way. Now that's not to say u have to much slop cuz I don't remember how much mine moves, ill try to remember to crawl under there today and spin the shafts and c how much they move.

98 tj sport 05-22-2013 06:12 AM

Here is a video showing the built in clearance in my yukon. Just fyi

jandaso 05-22-2013 11:38 AM

Does this work ?

n00g7 05-22-2013 12:37 PM

3 Attachment(s)
Any lateral movement?

98 tj sport 05-22-2013 01:27 PM

Angles don't look bad from what I can c, have u tried removing each driveshaft individually and see if removing either on gets rid of the vibes?

jandaso 05-22-2013 01:50 PM

Nope i will have to do that.....i know how to take the front one from botch ends but i dont know how tot.ake the rear one from the tc side.....also i just went and pushed side to side the jeep and the rear driverside sounded like a loose tire but guess what ???? The wheel is not loose at all ... might be a loose axle ??? Man just a eild guess

jandaso 05-22-2013 02:05 PM

Clunk noise btw

98 tj sport 05-22-2013 02:28 PM

The rear shaft just slides off the transfer case, just unbolt from the rearend then pull it off, as far as the clunking, crawl under and check all ur bolts, control arms upper and lower, trac bar at both ends, trac bar mount extension if u have one, and anything else u c under there, it may help to have someone move it while u are under there to c if u can locate it, my track bar extension came loose on mine before and if I moved the back end it would clank and make noise, crawled under and found that extension on the axle side was loose.

jandaso 05-22-2013 05:28 PM

Took the front shaft out and almost all of the vibrations are gone, I need to rebuild the drive shaft since all the joints are all bad and need to get that she.....thanks everybody for the comments ....also I need to figure out why I have that clunk noise

jandaso 05-22-2013 05:30 PM

If you lift the up complete with the tires up in the air an you rock the tires should they be solid ???? Or would there be a little question is because when I have the jeep up I went ahead and rock the tires in and out the axles and felt and heart a small clunk noise

98 tj sport 05-22-2013 07:46 PM

How did u move the tires like spinning them or pulling them out and pushing them n

jandaso 05-23-2013 09:34 AM

pulling them out and pushing them in

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