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Old 09-08-2007, 11:54 PM   #1
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Driveline problem on video..

Hey guys, looking to get opinions on this problem..
99 TJ 4.0 Automatic
OME 2.5" lift
1" bl and mml.

Problem is when putting it on reverse the rig goes up and a loud clank. Weird. The motor mounts are fine, the tranny mount was replaced with a Mopar one.
Take a look at the video. Everything is tight. We put 1" tc drop pucks to see if anything changes.

When the rig is on 4h, it does not do it. It shifts smooth and drives smooth.
It only does it on 2wd. Anyone ever had this problem? Trans? Transfer case?



See how the driveshaft snaps like that?
We were going to replace the u joints, but they are fine..

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Old 09-09-2007, 12:10 AM   #2
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Looks like something is binding.

Jack up the rear axle and put the tranny in neutral and rotate the drive shaft. See if you can feel anything weird, if not I would think something in the rear diff is wrong. But I donno.

My jeep has always jerked a bit when shifting into gear. Its just the diel taking up the slack in the drive line. But I don't think it moves that much. Yours looks to be popping up and down a bit.

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Old 09-09-2007, 12:11 AM   #3
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Damn! That can't be good. Don't know though... Pinion binding maybe?
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Old 09-09-2007, 12:13 AM   #4
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We did that and it was smooth. Here is a video of it showing how it reacts on 4h. This is weird..

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Old 09-09-2007, 12:17 AM   #5
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What is goes on in 2wd that doesent go down during 4wd? Might narrow something down?

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Old 09-09-2007, 12:22 AM   #6
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My thoughts on that is that when in 4h, other parts are taking the blunt of the force and making it seem like it goes away.. Don't know though..
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Old 09-09-2007, 12:23 AM   #7
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Quote:
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My thoughts on that is that when in 4h, other parts are taking the blunt of the force and making it seem like it goes away.. Don't know though..
Exactly what I was thinking. I'll do some research into it maybe i'll find something.

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Old 09-09-2007, 12:24 AM   #8
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Well you see the Jeep squat and lift a little between neutral and drive/reverse. Its less noticable in 4WD because of the power split. But in 2wd there is more power to the rear and the greater squat. There is always going to be a bit of squat, but I dont think it should be that bad.
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Old 09-09-2007, 12:26 AM   #9
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Are you able to drive it at all?

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Old 09-09-2007, 12:27 AM   #10
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I always thought it was nnormal for the jeep to go upwards when I put it into drive haha
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Old 09-09-2007, 12:29 AM   #11
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I always thought it was nnormal for the jeep to go upwards when I put it into drive haha
It is a little bit, bit if you look at the driveshaft, it looks like its jerking a bit, like snapping into place instead of just turning.
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Old 09-09-2007, 12:33 AM   #12
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Yeah it drives fine. Even better on 4H.

We did jack up the rear end, with foot on brake and e-brake up, it made the passenger wheel turn when it was shifted to reverse. Crazy..
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Old 09-09-2007, 01:27 AM   #13
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Yeah it drives fine. Even better on 4H.

We did jack up the rear end, with foot on brake and e-brake up, it made the passenger wheel turn when it was shifted to reverse. Crazy..
This was done in 2H? Just to clarify, done in 2H with back jacked up, foot on brakes (i.e. font won't move), and e-brake not engaged (i.e. rear CAN move), you get the passenger tire to move but not both?

Got vid of this?

If thats the case it sounds like something in the diff or drivers side outter is binding up the drivers side.

Strange...
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Old 09-09-2007, 02:15 AM   #14
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If you only have a 2.5" lift why the big transfer case drop? Especially with the mml. You should need no drop at all.

I am thinking either drive line angles or bad u-joint in the rear.
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Old 09-09-2007, 08:38 AM   #15
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Quote:
Originally Posted by AzTJ View Post
Well you see the Jeep squat and lift a little between neutral and drive/reverse. Its less noticable in 4WD because of the power split. But in 2wd there is more power to the rear and the greater squat. There is always going to be a bit of squat, but I dont think it should be that bad.
Is it idling to high? It is reacting like when foot jacking an old mopar.
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Old 09-09-2007, 11:07 AM   #16
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jack up one end of the rear (i assume you dont have limited slip or lockers). Put the transmission in Neutral, no brakes no handbrake. Put the tcase in 2wd. Try to spin the lifted tire and make sure the drive shaft is spinning so now you will be able to spin the tcase up to the transmission see if you can get similar knocking.
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Old 09-09-2007, 02:09 PM   #17
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I think the dog knows whats wrong.... but it appears he's not gonna tell...



I just think its and automatic thing... I dont recall having that happen on my jeeps..
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Old 09-09-2007, 03:55 PM   #18
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your pinion is wrapping pretty bad. Looks to me like you have some warn bushings in the control arms. If your control arm bushings held the axle still you wouldn't notice the pinion wrap. Which should level out the torque load into the suspension.
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Old 09-09-2007, 11:25 PM   #19
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Looks like it's taking up about 1/4 turn of slack in the rear end before anything moves. If it were me, I'd pull the rear axle cover, check the backlash and take a really close look at the spider gears.
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Old 09-10-2007, 05:20 PM   #20
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Mr C could it be loose cam bolts or missing lobes?
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Old 09-10-2007, 05:23 PM   #21
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could be loose anything. The best way I've found to isolate that problem is by setting the emergency brake. Then you can simply let your foot off the brake a bit and it will sit still while not running you over. Get under there and see what is going on. If something is loose then tighten it. If that doesn't fix the problem then upgrade.
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Old 09-10-2007, 05:58 PM   #22
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Quote:
Originally Posted by MR.CLIFFORD View Post
will sit still while not running you over. Get under there and see what is going on

Or the dog there or on 2nd thought the dog might tell you whats wrong if you pressure it so.. up to you :P
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Old 09-10-2007, 06:01 PM   #23
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let me rephrase... you need someone in the drivers seat with their foot on the brake pedal just in case. Never get under your junk without someone else attending to it.
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Old 09-11-2007, 02:24 PM   #24
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Something simmilar happened on my 95 XJ after a 2 in lift, it pulled too much of the slip yoke out of the transfer case and caused it to wonder on the shaft eventually leading to it falling off. Noob mistake being my first jeep.

Solution: SYE and longer drive shaft.

Also can be excentuated by excessive ring gear and pinion gear lash in the diff. Depending on how many miles and off road duty you're jeep as seen.

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