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Unread 01-05-2013, 03:48 PM   #1
celticrebel
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91 yj trouble in 4x4

I would appreciate all help i could get. I have a 91 yj 4.0 open dif with stock hp dana 30 front dana 35 rear. When i shift into 4x4 the jeep runs fine till it seems like anything tougher then flat dirt road then it binds up and will not move. The rear tires will spin but not the front. I was told it could be the cad so i did a diy posi lock and it works fine. I have checked the gear ratio and they are the same front and back. I have put the jeep up on 4 jacks in the garage and tried to re create the problem as well as make sure the 4x4 works it does. I can not get it to recreate in garage only out on trail. I have also pulled the cover on the front dif and everything appears fine no chipped gears that i could see. I apologize for the long post just wanted to get all the info out i could.

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Unread 01-05-2013, 03:55 PM   #2
Red93yj
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Does it lock up while turning or going straight.
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Unread 01-05-2013, 03:59 PM   #3
Ripper3494
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sounds like a transfer case issue to me... i know you cant create it in the garage but does your front driveshaft spin or no while the front wheels are stuck and the rears are spinning? maybe have a friend watch. or go in the front yard, hold your brakes in 4wd and give it some gas
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1994 yj stretched, locked and loaded - 6.0l vortec lq4, 4l60e, np231, Dana 44s 37" interco trxus m/t, 3.5" bds front leafs, double triangulated 4 link rear on xj front coils.
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my tj 1/2 doors on a yj write up
[url]http://www.jeepforum.com/forum/f12/tj-uppers-yj-half-doors-hard-top-installation-1417686/[/url]
RC vs BDS
[url]http://www.jeepforum.com/forum/f12/rough-country-vs-bds-1461555/[/url]
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Unread 01-05-2013, 04:26 PM   #4
celticrebel
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It locked up once going straight and once turned slightly
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Unread 01-05-2013, 04:31 PM   #5
celticrebel
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Quote:
Originally Posted by Ripper3494 View Post
sounds like a transfer case issue to me... i know you cant create it in the garage but does your front driveshaft spin or no while the front wheels are stuck and the rears are spinning? maybe have a friend watch. or go in the front yard, hold your brakes in 4wd and give it some gas
I dont think the driveshaft was spinning not sure though. Mabe i should just go out to the desert with all my tools wait for it to happen then start tacking everything apart.lol
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Unread 01-05-2013, 04:35 PM   #6
Ripper3494
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Quote:
Originally Posted by celticrebel View Post

I dont think the driveshaft was spinning not sure though. Mabe i should just go out to the desert with all my tools wait for it to happen then start tacking everything apart.lol
If the shaft doesn't spin that's deff a problem inside your t case
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build thread:
[url]http://www.jeepforum.com/forum/f22/94-yj-6-0-build-spud-1218315/[/url]
1994 yj stretched, locked and loaded - 6.0l vortec lq4, 4l60e, np231, Dana 44s 37" interco trxus m/t, 3.5" bds front leafs, double triangulated 4 link rear on xj front coils.
1997 ZJ limited - BONE stock
2003 tj - 4in skyjacker, 33" mickey thompsons
my on board alternator/welder write up
[url]http://www.jeepforum.com/forum/f12/alternator-welder-write-up-1301614/[/url]
my tj 1/2 doors on a yj write up
[url]http://www.jeepforum.com/forum/f12/tj-uppers-yj-half-doors-hard-top-installation-1417686/[/url]
RC vs BDS
[url]http://www.jeepforum.com/forum/f12/rough-country-vs-bds-1461555/[/url]
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Unread 01-05-2013, 08:45 PM   #7
celticrebel
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Drive shaft does spin just not sure if it does when jeep bound up
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Unread 01-05-2013, 09:00 PM   #8
mike_breaker_5
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axle u-joints?
driveshaft u-joints?
carrier bearings tight when you checked the diff?
if not those i would also say it may be an x-case issue.
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Unread 01-07-2013, 08:49 PM   #9
celticrebel
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Quote:
Originally Posted by mike_breaker_5 View Post
axle u-joints?
driveshaft u-joints?
carrier bearings tight when you checked the diff?
if not those i would also say it may be an x-case issue.
What is the best way to check u-joints and carrier bearings. They appear fine but would like info on proper way to check.
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Unread 01-08-2013, 03:45 AM   #10
mike_breaker_5
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u- joints can be tricky, at least the ones in the knuckles. any other u-joint you can normally feel or hear. for the joints in the knuckles, the wayy i do it, jack one front tire up leaving it free to turn with the steering. rotate the tire with short quick jerks and listen for clunking, grinding, or grating. reach your hand in there and grab one side of the axle shaft. wiggle that little sucker around in there and feel for the same as before. you can also rotate it slightly to feel for play, but be careful it's easy to get pinched. lastly if none of those yield a result give her a good old visual inspection to look for cracks of evident wear. i suppose you can do the visual inspection first, but whatever you get the point.

i suppose the carrier bearings would just be a visual inspection mostly. i suppose you could jack the front up, spin the tires, and listen for noise. they usually aren't a failure point. i only mentioned it because you said you had it apart.

another thing i just thought of...
is your front pinion nut torqued properly and is the seal in good shape? if these are not in proper then you could get a similar issue i would bet.
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Unread 01-08-2013, 08:12 AM   #11
celticrebel
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Ok thanks i will check on my first day off. I will give a update
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Unread 01-08-2013, 02:18 PM   #12
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I'd be looking at the t-case first. I've never heard of a 231 locking up. Lucky for you they are stupid simple to remove and crack.
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Unread 02-11-2013, 07:03 PM   #13
celticrebel
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Update took apart t case for sye install and every thing looked good. I am removing skid plate spacer since i am getting a new rear drive shaft and replacing both axles ford 8.8 rear dana 30 front both with 4.10 gears. Hopefully problem will be fixed.
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Unread 02-15-2013, 12:12 PM   #14
celticrebel
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I ordered the 8.8 axle swap kit from ruffstuff 2 weeks ago still not here not very happy.
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Unread 02-15-2013, 01:45 PM   #15
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Quote:
Originally Posted by celticrebel View Post
I ordered the 8.8 axle swap kit from ruffstuff 2 weeks ago still not here not very happy.
3 words.... KOH. Ruff Stuff is the best vendor one can find. KOH was last week and Dan was there with his team fixing other peoples broken cars for free. Give him some time to catch up.

KOH = King of the Hammers

edit - thats 4 words
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