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Old 12-18-2005, 10:16 PM   #1
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4wd won't disengage

If I am moving in 4hi in my '97 TJ and drop the lever to 2wd, it doesn't disengage fully, if at all, for a while. I have two options. Keep driving and some time down the road with a large bang it goes to 2wd, or stop and back up a few feet which will disengage it. If I come to a complete stop in 4wd and then drop the lever to 2wd, more often than not I still have the same issue. Anything I can do to get it to shift immediately back to 2wd when I drop the lever?

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Old 12-19-2005, 01:12 AM   #2
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Back off the gas, that will speed up the move back into 2wd.

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Old 12-19-2005, 05:59 AM   #3
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i know that in 4L you need to reverse to disengage, but you shouldn't have any problems in 4H. If i were you i'd check all the linkage to the TC. Actually that happened to my dads truck last night and it ended up being a simple cotter pin that had rusted away.
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Old 12-19-2005, 09:48 AM   #4
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Quote:
Originally Posted by legacy
i know that in 4L you need to reverse to disengage
Absolutely no need to drive in Reverse to disengage 4L. That might have helped some older 4wd systems but the TJ's isn't one of them.
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Old 12-19-2005, 12:10 PM   #5
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Quote:
Originally Posted by Jerry Bransford
Absolutely no need to drive in Reverse to disengage 4L. That might have helped some older 4wd systems but the TJ's isn't one of them.
Yup, i'll second that. Never had any problems disengaging from any 4WD position back to 2WD in my TJ.
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Old 12-19-2005, 04:39 PM   #6
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My 99TJ is doing the same thing, thinking the bang is coming from a bad drive shaft u joint...going to check it out later this week....
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Old 12-19-2005, 05:59 PM   #7
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Never had to back the YJ up to disengage 4wheel but I had an 87 Dakota that you had to back up sometimes 20 yards or more to disengage. Thatthing is the only 4X4 I've ever had that was somewhat comparable to a Jeep off road wise. I miss that one.
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Old 12-20-2005, 07:57 PM   #8
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Quote:
Originally Posted by amerijeep
Never had to back the YJ up to disengage 4wheel but I had an 87 Dakota that you had to back up sometimes 20 yards or more to disengage. Thatthing is the only 4X4 I've ever had that was somewhat comparable to a Jeep off road wise. I miss that one.
my 88 Dodge pickup was the same way. I had to backup to get it to disengage out of 4 wheel.
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Old 12-20-2005, 08:45 PM   #9
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well i dunno, thats just what i always did because thats what peole said to do plus thats what i read somewhere.
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Old 12-20-2005, 09:47 PM   #10
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Quote:
Originally Posted by legacy
well i dunno, thats just what i always did because thats what peole said to do plus thats what i read somewhere.
A guy down the street from me has a TJ and he said that he backs his to disengage also. I believe there may be something out of adjustment. He said it hasn't always been like that, but started in the past few years.

Incidently, I saw in another thread where someone said a TJ has the tightest turning radius of all the SWB Jeeps. I have always heard that too, but we just were out in playing and his wouldn't turn as tight as my YJ. Of course my tires rub my springs so maybe it has something to do with my bump stops being set differently.
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Old 01-07-2006, 07:22 PM   #11
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You should not have to reverse to disengage the TJ. You should however let off the throttle as Jerry said. This will "unload" the transfercase and allow it to slip back out of 4h. To shift into 4l it is best to shift trans to N while at a slight roll 1-2 MPH and shift it into 4l, shift out the same way.
Most older 4wd trucks had to be backed up not to disengage the transfer case but the automatic locking hubs or the axle/differential disconnect.
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Old 02-15-2006, 12:25 AM   #12
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Quote:
Originally Posted by amerijeep
Never had to back the YJ up to disengage 4wheel but I had an 87 Dakota that you had to back up sometimes 20 yards or more to disengage. Thatthing is the only 4X4 I've ever had that was somewhat comparable to a Jeep off road wise. I miss that one.
i know your pain, i have a 96 bronco that i have to back up for some 10-20 ft, but i love that thing still have and going to turn it in to a street illegal truck, but my 97 TJ has never had to back up to take it out of high or low.
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Old 02-16-2006, 06:01 AM   #13
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I'll have to find someone better than me to find what is out of adjustment. For now, if I don't back up it won't disengage no matter what other techniques I employ.
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Old 02-16-2006, 07:05 AM   #14
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These systems won't disengage if there is binding pressure on the drivetrain. If you drive on a surface that has good traction, even just a short distance, you can accumulate binding pressure on the TC (transfer case) from differences in rotation of the front driveline and the rear. This happens when you turn to the left or right or even from slightly different sized tires. Usually we drive in 4wd during slippery conditions where the tires can slip and not accumulate pressure, then we wait till we get out of the slippery condition and then drive a little farther to make sure it's over (which can build up the pressure) and then try to disengage the 4wd. This is typical and it is our job to figure out how to relieve the binding pressure. It can be as easy as turning from left to right, backing up, stopping and putting the TC in neutral, slipping the tires in some gravel, etc. It's not good to prolong the time driving with this pressure. The weakest link (u-joints) can break and leave us stranded. Relieve it as soon as you can and go on in 2wd. This is normal for any "part time" 4wd system. "Full time" systems can build pressure only when in the "locked" position. This is usually explained in the owners manual.
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Old 02-16-2006, 07:09 AM   #15
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Are your tires all the same size and make? Is the air pressure in all tires the same? If not this can create the pressure from just driving in a straight line.
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Old 02-16-2006, 10:25 AM   #16
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Once again, the TJ has nothing in its 4wd system that is helped to disengage any faster by backing up.
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Old 02-17-2006, 07:40 AM   #17
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Jerry, if the tires are different size or pressure backing up can undo the binding pressure that driving forward caused.

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