4WD Problem. Need Much Help - JeepForum.com
 
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post #1 of 11 Old 02-26-2014, 11:54 PM Thread Starter
riffraff21
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4WD Problem. Need Much Help

Whenever I put my XJ into 4hi it starts to shudder and jerk forward as if it is hesitant to move forward. It's not making a terrible noise, however it does have a considerable amount of vibration and movement (imagine pumping the clutch really fast while on the gas). The strangest part is that when I move it back into 2hi, the issue is still present UNTIL I put it into reverse, go back a few feet, then move forward.
Any insight you can give me would be helpful. I also noticed the issue on both ice and pavement. I know its normal for 4hi to feel weird on pavement but I feel as if this might be beyond that (maybe not?)

1998 XJ 4.0I6 Manual 5spd 3"lift
the axles are stock as far as I know

Note: The trans mount needs to be replaced
Note of Note: Idk if that is relevant or not
Another Note: I'm a newbie (to Jeeps)(and 4x4)

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post #2 of 11 Old 02-27-2014, 04:31 AM
RLE
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If the transmission mount is deteriorated, it is not going to hold the
trans in place. So, when you put it in 4Hi, the extra torque can make
the trans hop around and cause what you describe.

You should fix the tranny mount asap and see if it helps your problem.
If you don't fix it soon, you'll risk breaking your motor mounts, too,
and then you'll really have a problem.

Since you just got this Jeep, the problem may have existed for a while,
so check your motor mounts, too. (for more info on that, see the "sticky"
at the top of the forum)

You should change all fluids on the vehicle unless you know its previous
service history (eg. you bought it from someone you know well). Engine
oil and filter, radiator coolant, transmission, front and rear diffs. If you
can't get to them immediately, at least top them off.

Last edited by RLE; 02-27-2014 at 04:37 AM. Reason: additions
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post #3 of 11 Old 02-27-2014, 06:43 AM
M35A2
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Are you on dry pavement when it happens?

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Just got a 1989 YJ too!
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post #4 of 11 Old 02-27-2014, 07:32 AM Thread Starter
riffraff21
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Fluids have been changed and I am replacing the trans mount today and I'll let you know if that helps. I noticed it on both pavement and ice.

Thanks for the responses!
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post #5 of 11 Old 02-27-2014, 07:51 AM
cory4um
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Quote:
Originally Posted by riffraff21 View Post
The strangest part is that when I move it back into 2hi, the issue is still present UNTIL I put it into reverse, go back a few feet, then move forward.
Any insight you can give me would be helpful. I also noticed the issue on both ice and pavement. I know its normal for 4hi to feel weird on pavement but I feel as if this might be beyond that (maybe not?) )


Having to reverse for 4wd to disengage is common.
You can try adjusting the transfer case linkage ( how-to can be searched here).
Adjusting the linkage is key for smooth operation.

A worn tranny mount will cause the driveline to drop a bit. Enough to pull the linkage out of wack..

Adjusting linkage may also fix your vibration or surges as it may not fully be engagingthe 4wd..

How does 4 lo work?
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post #6 of 11 Old 02-27-2014, 08:08 AM Thread Starter
riffraff21
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Well that's good to know that reversing it out of 4wd is normal. I haven't tried 4lo because I'm really hesitant to do so (4hi is interesting enough). I will swap the trans mount and tighten up the engine mounts to see if that works. After I do that I will check out 4lo to see if its in the same way. Will update.
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post #7 of 11 Old 02-27-2014, 09:44 PM
cruiser54
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Quote:
Originally Posted by riffraff21 View Post
Well that's good to know that reversing it out of 4wd is normal. I haven't tried 4lo because I'm really hesitant to do so (4hi is interesting enough). I will swap the trans mount and tighten up the engine mounts to see if that works. After I do that I will check out 4lo to see if its in the same way. Will update.
Here is the factory recommended procedure for shifting.



Here's how the factory suggests you shift the transfer case and I've been doing this since these things were new and I worked at the dealership. Quoted from the owner's manual. The suggestions in ITALICS are mine.

"To engage, shift the transfer case lever from 2H to 4H while the vehicle is moving at any legal speed". I let off the gas, throw the lever, and then tap the gas and let off.

4L position: " To engage, slow the vehicle to 2-3 MPH , shift the transmission to Neutral, then shift the transfer lever to the right and pull firmly rearward to 4L".

To shift out of 4L, shift the transmission into neutral with the vehicle stopped, shift the transfer case lever to 2H, then to D if you have an automatic, or into first gear with a manual, and continue on.


Revised 01-31-2014

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post #8 of 11 Old 02-28-2014, 12:43 AM
Renix
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Replace tranny mount, adjust transfer case linkage, replace front diveshaft u joints they probably are old and worn. If these don't fix it more info is needed. I.e. Transfer case type, lift size if any, front pinion angle if lifted, and if you don't have a full time 4 wheel drive transfer case don't put it in 4hi or 4lo on pavement.
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post #9 of 11 Old 03-01-2014, 11:54 AM Thread Starter
riffraff21
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Ok so the tranny mount has been replaced along with the front U-joints. This has made things a lot better however there I have found some play in the front driveshaft, I have a feeling that its on its last leg.
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post #10 of 11 Old 03-01-2014, 12:23 PM
RLE
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Congratulations on the progress.

Quote:
I have found some play in the front driveshaft, I have a feeling
that its on its last leg
Where exactly is the play?
In the driveshaft slip yoke?
In the front u-joint?
In the CV unit and its two u-joints?
In the pinion yoke?

You can get a front driveshaft from a junkyard, although for a manual XJ
they are harder to find than for an automatic. If you can't find a good
one for a manual XJ, you can have one that is from an automatic shortened
and balanced at a driveline shop easily enough.

If the play is in the pinion yoke, then that is another matter.
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post #11 of 11 Old 03-01-2014, 03:33 PM Thread Starter
riffraff21
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Its the slip yoke. I'm gonna start looking around for a used front driveshaft in the nearby junkyards and get that replaced. If it doesn't eliminate the problem for good then I will consult this thread and all you nice people again.

Thanks for help!
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4x4 , front axle , grinding , vibration

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