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Old January 21st, 2011, 08:53 PM   #1
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Default 4wd question

Girlfriends WJ doesn't always engage into 4wd when shifted, and sometimes sticks in 4wd and doesn't go into 2wd when shifted at times.

It's intermittentant, when it does finally engage or disengage you never really even notice the shift itself.

4.0 with nv242
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Old January 21st, 2011, 09:24 PM   #2
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Transfer case or CAD?
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Old January 22nd, 2011, 07:54 AM   #3
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Originally Posted by whiterhino View Post
Transfer case or CAD?
I dunno, I don't know anything about the WJ's system. my XJ's and TJ's had no disconnect and were straight mechanical shift mechanisms, I haven't peaked under the wj to see what I was dealing with yet. In fact I haven't driven it in a while to even see what she is complaining about.
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Old January 22nd, 2011, 07:59 AM   #4
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I know that my wifes WJ, and most of the 231's won't engage/disengage if you are still in the trottle when you move the selector. I generally engage the T-case, then let up on the throttle and it will go in or out.
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Old January 22nd, 2011, 12:21 PM   #5
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The 242 in my WJ acts the same way. If you shift it in or out while on the throttle, it will wait until there is no load on the driveline to engage/disengage. There must be some kind of spring or something in the linkage that allows the shifter to be moved w/o instantly causing a shift at the TC.
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Old January 22nd, 2011, 12:23 PM   #6
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my wifes does the same damn thing ... do what cjric said
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Old January 22nd, 2011, 02:42 PM   #7
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Originally Posted by cjric View Post
The 242 in my WJ acts the same way. If you shift it in or out while on the throttle, it will wait until there is no load on the driveline to engage/disengage. There must be some kind of spring or something in the linkage that allows the shifter to be moved w/o instantly causing a shift at the TC.
I've noticed this, but we're talking staying engaged for miles and miles after shifting out of 4wd, so it's sticking past the point of letting off the gas.
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Old January 22nd, 2011, 06:07 PM   #8
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I've noticed this, but we're talking staying engaged for miles and miles after shifting out of 4wd, so it's sticking past the point of letting off the gas.
My '04 used to do that same thing. I found that lifting my foot off the throttle before I pull the lever going in or out and shifting it fast took care of the sticking. It doesn't do it but once in a great while since I started shifting it that way.
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Old January 22nd, 2011, 06:30 PM   #9
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Sounds like maybe just a linkage adjustment.
I'm not too familiar w/ what goes on between the shifter and the TC in a WJ though....
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Old January 23rd, 2011, 01:34 PM   #10
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check the fluid
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Old January 24th, 2011, 11:29 AM   #11
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Sounds like maybe just a linkage adjustment.
I'm not too familiar w/ what goes on between the shifter and the TC in a WJ though....
me either to be honest.

Last night I drove it, shifted it from Full time 4wd while sitting in the driveway and trans in nuetral, into 2wd. put trans in drive, inched forward, dropped it in reverse and headed out of the sub, drove to the party store, parked, still in 4wd, drove home, when I pulled back into the sub I gassed it kinda hard and let off, heard it shift back into 2wd finally.

Party store is 3 miles round trip. I don't think if I had gassed it that it woulda popped out.

I've still yet to do crawl under it. been sick
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check the fluid
good call, I haven't noticed any leaking though
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Old January 25th, 2011, 07:13 PM   #12
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X2.....check the fuild.
My NP242 ZJ started doing that, fuild change, all better.
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Old January 25th, 2011, 08:57 PM   #13
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The linkage bushings get worn out and it doesn't shift quite like it should. My ZJ w/ 242 did a similar thing. It costs like $20 for the linkage rebuild kit and takes about an hour to do. No guarantees but it's something to consider.
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Old January 26th, 2011, 12:55 PM   #14
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I think this answers my questions.

http://ezinearticles.com/?Jeep-Selec...tion&id=281045

Quote:
The NP 242 transfer case can be switched between 2wd and either 4wd mode at any speed simply by moving the lever. The switch to low range must be made at very low speed - the Jeep manual says 3 mph.

One common operating problem with the 242 transfer case is that it will stick in 4wd even if the lever is moved to 2wd. Internally, moving the lever loads a spring which then applies force to move the selector fork. If the gears are loaded with torque, the spring will not have enough energy to move the sleeve off the gears. Once torque is removed from the gears, the spring will then move the fork and slide the sleeve of the gears.

Momentarily lifting your foot off the gas will often unload the gears enough to allow the spring pressure to move the fork. On some high mileage units, a wear groove will form on the sleeve or gear causing it to stick longer and may require a couple of changes from loaded to unloaded to get the sleeve to release form the gear.

The Jeep NP 242 is lubricated with Automatic Transmission fluid. The level is checked by removing the upper of the two large plugs on the back of the case. The fluid should be level with the upper plug.
so, if a fluid change doesn't stop the little lady from bitching, I'll pull the t-case and do the linkage deal, and replace this sleeve or gear that seems to be the issue.

Last edited by kickstand; January 26th, 2011 at 01:01 PM.
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