4 Wheel drive problems - JeepForum.com
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post #1 of 8 Old 10-21-2001, 11:06 PM Thread Starter
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4 Wheel drive problems

Recently my 4WD just went out... yeah, i know, whats a jeep without 4WD??? a box with wheels and a powerful engine... well, being in college, i just desided to let it go for the fall months, but now winter's coming, and i need to get it fixed. I wasn't in a big hurry until the jeep started to vibrate right around that 40 mph range. it also has a clicking noise as i slow down to a stop, and then there would be a pop(not loud, but loud enough to hear... i can stop the clicking and pop if i just give a slight pull on the 4WD stick... until i slow down again of course) acceleration is smooth until about 35mph, then it vibrates bad enough to shake the keys,,, i was hoping someone would be able to tell me what the problem might be... obviously i HAVE to get this fixed...

and another question, how hard is it to rebuild the rear differential??? or how much do you think i would have to shell out to have it done???? the rear end is getting a bit loose...

any help would be appreciated for my good ol 89 4.2, 4" rancho lifted, mud toy(and snow ofcourse!!!) later yall

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post #2 of 8 Old 10-23-2001, 02:36 PM
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well i can only help ya with the rear end question.....you cant fix gears yourself unless youve done it b4. Thats a shop thing. But what do you mean by it being loose??

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....that sounds expensive..
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post #3 of 8 Old 10-23-2001, 04:17 PM Thread Starter
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yeah, i agree that the gears are beyond me... oh well, but i mean the rear end is loose... the back wheels are actually able to pull in and out... not actually come out, it is drivable, but the axle shaft moves in and out an inch or so... its time to be fixed. probably coming this weekend...
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post #4 of 8 Old 10-23-2001, 05:55 PM
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You probably need to get your transfer case looked at, it might need to be rebuilt or you need a new one.

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post #5 of 8 Old 11-08-2001, 06:38 PM
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About 3 months ago I had my rear differential almost completely rebuilt (the ring and pinion were ok) and it was $550+ at the dealer.

Maybe at some time you drove on hard pavement and "locked" your 4WD in place? Just shooting from the hip on this one. You could try putting your vehicle in 4WD on hard ground and back up for quite a few feet and then disegage the 4WD again. Maybe that would help?

Anyway my $.02


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post #6 of 8 Old 11-08-2001, 11:23 PM
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i hope you werent using your 4wd on regular dry roads.. that'll kill a transfer case deader than sh*t..

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post #7 of 8 Old 11-09-2001, 08:08 PM Thread Starter
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the Tcase is fine, the vaccum lines are in place, i'm guessing its the hubs... i haven't had a chance to pull them, damn classes. i'll get to it this weekend i guess.
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post #8 of 8 Old 11-10-2001, 09:59 AM
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The first time I looked at you post, I dod not notice that you are running 4" of lift on a YJ. Do you have a slip yoke eliminator and a CV rear driveshaft, or have you lowered the t-case at least 2" and shimed the rear axle? While tons of people do it, 4" is too much lift without correcting the driveline angles. BAsed on the age of you Jeep, you have likely worn the U-joints on both driveshafts to the point of problems.

If your axleshafts have that much play, you need to fix this like yesterday.

As to the front, with time the part of the front dif that actually engages the front axle (one one side only, the other is always "locked") and wear out. So the t-case is in 4 hi, but the shaft can not spin the axleshafts. It's beyond me, but the vacuum engage is probaly shot (even if the lines are there and making a good vacuum). See if you can mechanically engage the axle.

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