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Unread 07-14-2013, 08:52 PM   #1
gpalmer456
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1988 XJ Cherokee 
 
Join Date: Jan 2013
Location: fredericktown, mo
Posts: 6
1988 XJ wont go in 4wd

did some trading and got my hands on a ratty xj that I've been wrenching on for a couple of months now. I got the brakes fixed, one of the oil leaks, and diff cover leak fixed. Now I am trying to figure out why it wont go in 4wd. The lever will go into 4H (wont go into anything else) but wont engage and there is a grind noise almost like some gears aren't fully meshed. Got underneath and I am completely confused. Can anyone direct me to a diagram, explain to me how the linkage is suppose to work, or give me any tips on how to diagnose the problem?

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Unread 07-14-2013, 09:15 PM   #2
cruiser54
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1990 MJ Comanche 
 
Join Date: Oct 2009
Location: Prescott, Arizona
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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.

"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".
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If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

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http://www.cherokeeforum.com/g/album/1725214
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Unread 07-14-2013, 09:16 PM   #3
cruiser54
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1990 MJ Comanche 
 
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And:

Transfer Case Linkage Adjustment

Straight from the FSM:

SHIFT LINKAGE ADJUSTMENT
(1) Shift transfer case into 4L position. (make sure your shifter is fully in the 4L position)
(2) Raise vehicle.
(3) Loosen lock bolt on adjusting trunnion (Fig.
87).
(4) Be sure linkage rod slides freely in trunnion.
Clean rod and apply spray lube if necessary.
(5) Verify that transfer case range lever is fully
engaged in 4L position. (you can do this under the vehicle at the transfer case)
(6) Tighten adjusting trunnion lock bolt.
(7) Lower vehicle
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Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 07-14-2013, 09:22 PM   #4
gpalmer456
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1988 XJ Cherokee 
 
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Location: fredericktown, mo
Posts: 6
lever wont move beyond 4h no matter what is done.
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Unread 07-14-2013, 09:26 PM   #5
cruiser54
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1990 MJ Comanche 
 
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Poke your noggin under the Jeep and have a gander. Here's why:

Chipmaker says:

“Way more problems get solved by using your five senses under your hood rather than your ten fingers on a keyboard”
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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 07-15-2013, 02:58 AM   #6
Timo_90xj
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1998 ZJ 
 
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Quote:
Originally Posted by gpalmer456 View Post
lever wont move beyond 4h no matter what is done.
Linkage adjustment.

If that won't cure it, you've got an internal problem on the TC. It is not unheard of that a 231 or 242 has broken shift forks or worn shift fork slide pads.
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1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...

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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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