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  • 4WD Problems!

    I have a 1993 YJ with a manual 4.0 and the 4wd doesn't work. The 4wd light comes on and I just installed a Posi lok kit to bypass the vacuum and it still doesn't work. Any thought's??

    Thanks!

  • #2
    Little more please...

    Dawg, throw me a bone here and give just a wee bit more info. Doesn't work is a pretty broad category. What specifically isn't it doing?
    You said light was coming on, which means the sensor works.

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    • #3
      When I put it into 4wd Hi I can't tell the difference from 2 wd either going straight or turning tight? From what I understand when it's in 4 Hi and I turn tight it should jump some. When I'm in 4wd Low it I can tell I'm in a lower gear but I don't get any better traction in snow so I'm assuming it's not in 4wd. When I turn on dry pavement, I get a pretty nasty clunking sound that sounds like it's coming from right under the middle of the Jeep.

      Hope that helps some. I've had this Jeep for almost 2 years and the 4wd never worked right and I'm sick of it. I'm no mechanic by any means but I keep trying.

      Thanks for your help!

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      • #4
        jack it up or have your mechanic put it on a lift and see if all four wheels spin.

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        • #5
          What jeepkid411 said. Low range can give you some problems in the snow 'cause the torque multiplication of the lower gears makes it much easier to spin the tires. Another test to see in the transfer case if working properly is to put it 4WD and in gear parked and see if you can turn the front driveshaft. You shouldn't be able to if the t-case is functioning properly. I think I'd start looking at whether or not the posi-lok is adjusted properly. You can actually try this with teh posi-lok, too. If the posi-lok is functioning properly the driveshaft shouldn't spin, either. At least not without trying to roll the vehicle.

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          • #6
            if the hubs are locked you won't turn the front driveshaft no matter what the tcase is doing.

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            • #7
              yj's don't have lock out hubs unless your get a warn hub kit or swap your axles . which then they be no need for the posi lock system

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              • #8
                Originally posted by Keystone Crawler
                yj's don't have lock out hubs unless your get a warn hub kit or swap your axles . which then they be no need for the posi lock system
                which means, if the front drive shaft can spin on your jeep, its a bad vacuum line somewhere (good luck) if it cant spin, then you have completed a simple test lol

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                • #9
                  Originally posted by bigtj99
                  which means, if the front drive shaft can spin on your jeep, its a bad vacuum line somewhere (good luck) if it cant spin, then you have completed a simple test lol
                  The whole point of the Posi-Lock system is to eliminate the faulty vacuum system from your 4WD.

                  I'd have to agree with Jeepkid, get the whole thing up off the ground, put it in 4WD, and see if all the wheels spin. If they don't, give the t-case a looksie, that could be the source of the clunking noise.

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                  • #10
                    A test you can do in your driveway would be to lock it in 4wd, lo or hi.
                    Jack the front and have someone help you spin both front wheels the same direction.
                    If you cant turn them your in 4 wd.
                    If you can, look at the driveshaft that goes into the front diff, is it spinning?
                    If it's spinning it's a t case prob. Your not engaging 4wd
                    If it's not it's a ring and pinion problem.

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                    • #11
                      You may also want to see if your dif may be broken. When the vehicle is jacked up lock the transfer case and spin one wheel to see if the other spins in the opposite direction. If it doesnt your spider gears in your diff may have broken or you may have a broken axle.

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                      • #12
                        OK, here's what I did yesterday............

                        I first of all determined the posi lok kit I put in did work.I then got all four wheels up off the ground. I spun one of the front wheels one direction and the other went the opposite so that's OK. I Put it in 4wd high. Only the back tires turned. Put it in 4wd low and all 4 turned. When we grabed the front tires we could stop them both and the front drive shaft stopped turning and there was a type of grinding clanging noise coming from the transfer case. The transfer case had oil in it. I chaged the T-case oil and it seemed pretty clean. Any ideas what to look for now??

                        Thanks!

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                        • #13
                          Time to play with the linkage. It's odd that you get 4-lo, but not 4-hi, but here's something to try from another post. Thank you LeadFoot for this suggestion:
                          Originally posted by LeadFoot
                          It's your t-case linkage. There is a 1/2" bolt that you can loosen that slips on the link that adjusts it. Loosen the bolt, and move the shifter back to 4-low. Grab a pair of channel locks, and pull on the rectangle shifter on the side of the t-case all of the way forward. Tighten the bolt, it should put you pretty close to a perfect set up. You may have to fine tune it alittle for it to work smoothly.

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                          • #14
                            Tried doing that. didn't seem to help. I'll try again. Maybe i didn't have it adjusted right. do you think i may have to get a new/used/rebuilt transfer case?

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                            • #15
                              If 2 hi and 4 lo work and 4 hi does not, sounds like something inside the t-case is messed up.

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