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Old 02-02-2014, 05:47 PM
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Hey guys new here question about my 4 wheel drive

I put it into 4 high back up a bit the light comes on says its in 4 wheel but doesn't actualy move front wheels, I jacked the car up tested vac lines and when not in 4 wheel the one closest to passenger side has vac and when in 4 wheel the one closer to drive side has it so that checks out also it's in 4 wheel and I can spin the front wheels and I see the drive shaft spinning so I'm currently confused what do I have to do to make the 4 wheel work? Thanks it's a 93 yj 6cyl

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Old 02-02-2014, 06:05 PM   #2
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With the light coming on that means your vacuum is correct, sensor works and shift motor is moving. So if I'm not mistaken it could be a broken shift fork or axle shaft. And just to reassure readers, do you have a locker or open diff? If it's open then you might not think it's in 4wd but it is. Since the open diff allows the tire that has no traction spin with all the power from the engine. The tire that is on the ground stuck on a rock or log etc. will not spin until the free spinning tire gets traction.

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Old 02-02-2014, 07:07 PM
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I believe open diff and I had it up on 4 jack stands and tried to drive in 4 high and only the rears spun neither front spun but when I spin them by hand they make the drive shaft move
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Old 02-02-2014, 07:13 PM   #4
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I would check your TC linkage to ensure that it's shifting into 4HI and 4LO.
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Old 02-02-2014, 07:23 PM
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How do I check it new here
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Old 02-02-2014, 07:42 PM   #6
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Ahh, sorry. Get underneath on the drivers side and look up to the transmission. Have someone shift around with the TC shifter and watch as the linkage moves it should be fairly firm/tight with little wiggle movement. If the linkage looks wobbly tighten it up and try again. There are.two mounting bolts ontology if the trans and two on the side of the trans one being one that bolts the TC to the trans.
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Old 02-02-2014, 08:36 PM   #7
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I may be wrong here but if the light is coming when shifted into 4wd...wouldn't that mean the shifter is shifting the TC properly..? The switch for the 4wd light is a mechanical connection made by the movement of parts inside the TC...just me thinking out load though..
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Old 02-02-2014, 08:50 PM   #8
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I'm honestly not sure how the vacuum switch works. But it never hurts to check.
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Old 02-02-2014, 09:15 PM   #9
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Well...as I understand it the vacuum is always sent to the TC but when you move the shifter into a 4wd position it open the valve and let's the vacuum proceed down to the axle and into the diaphragm. This moves the shifting fork and slides the collar onto both axles shafts and locks the front axle.
When the vacuum at the axle moves the shifting fork it hits a switch that then turns on the "4wd" light on the dash.
But your right...never hurts to give it a good once over.
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Old 02-02-2014, 09:21 PM   #10
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Then I guess it could be a TC problem then cause from what the PO said everything else is working properly.
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Old 02-03-2014, 11:26 AM   #11
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If the front driveshaft is not spinning in 4x4 with all four wheels off of the ground then it sounds like a bad transfer case to me. Or the linkage is bad and it's not really shifting all the way into 4x4. If your CAD was the issue the driveshaft would turn but you still wouldn't have power to the front.

Try this...(carefully)

Put the whole jeep up on jack stands so all four tires are off of the ground.

With the engine running shift into 4 hi. Wait for 4x4 light to come on. At this point all four tires should spin if you put the jeep in gear.

Turn engine off. Then shift TC to 2 hi with engine off. Now your front axle CAD is still locked but the transfer case is disconnected from the front drive shaft. You should be able to spin the driveshaft by hand and see the front tires turn. If they do turn you just verified that every thing past the TC works. So it prolly is your TC.

FYI at this point it's easy to check if you have an open diff. Grab one if the front tires and give it a spin. The other tire will spin the opposite direction if you have an open diff. If it's locked they will both spin the same direction. If the opposite tire does not move either your diff is hosed (would probably make a lot of terrible noises when driven, so I doubt this is it) or your CAD is bad.

You can also get an idea of your diff gearing by counting how many rotations of the driveshaft it takes to spin your tire one revolution.

Good luck!
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Old 02-04-2014, 01:21 AM
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Originally Posted by Fabrokoner View Post
If the front driveshaft is not spinning in 4x4 with all four wheels off of the ground then it sounds like a bad transfer case to me. Or the linkage is bad and it's not really shifting all the way into 4x4. If your CAD was the issue the driveshaft would turn but you still wouldn't have power to the front. Try this...(carefully) Put the whole jeep up on jack stands so all four tires are off of the ground. With the engine running shift into 4 hi. Wait for 4x4 light to come on. At this point all four tires should spin if you put the jeep in gear. Turn engine off. Then shift TC to 2 hi with engine off. Now your front axle CAD is still locked but the transfer case is disconnected from the front drive shaft. You should be able to spin the driveshaft by hand and see the front tires turn. If they do turn you just verified that every thing past the TC works. So it prolly is your TC. FYI at this point it's easy to check if you have an open diff. Grab one if the front tires and give it a spin. The other tire will spin the opposite direction if you have an open diff. If it's locked they will both spin the same direction. If the opposite tire does not move either your diff is hosed (would probably make a lot of terrible noises when driven, so I doubt this is it) or your CAD is bad. You can also get an idea of your diff gearing by counting how many rotations of the driveshaft it takes to spin your tire one revolution. Good luck!

I will deff test this tomorrow I remember 2 nights ago when I had it in the air I spun the drive side wheel and the passenger side one moved Aswell but only once? Then I did it again and they were seperate so ill do your diagnostics and see what happens I'm hoping fixing this doesn't end up costin to much I am quite good with doing things my self tho
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Old 02-04-2014, 09:33 AM   #13
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I will deff test this tomorrow I remember 2 nights ago when I had it in the air I spun the drive side wheel and the passenger side one moved Aswell but only once? Then I did it again and they were separate so ill do your diagnostics and see what happens I'm hoping fixing this doesn't end up costin to much I am quite good with doing things my self tho
If you don't follow the exact sequence of shutting the engine down while in 4x4 your front axle is unlocked and the two front tires will not interact with each other.

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