247 troubleshooting - JeepForum.com
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post #1 of 10 Old 02-13-2019, 01:38 AM Thread Starter
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247 troubleshooting

Im working on a friends WJ. 2002 HO with the 247. I've only ever had the 242 but am familiar with the mechanical operation of the 247. Only the back wheels spin in the snow so i need to investigate.

My research indicates that i should try 4lo and see if it works and if it does, check fluid level or possibly drain and fill with correct fluid in case the wrong fluid is in there.

If that still doesn't fix the problem, the gerator is possibly burnt out, yes?

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post #2 of 10 Old 02-13-2019, 04:03 AM
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Step 1: Ask your friend if a front axle shaft was replace recently. It's quite common for the unknowing to install a non-VariLok shaft in a VariLok equipped vehicle. The one on the passenger side is shorter, so the diff just spins, with no torque going to the wheels. Solution: install the correct shaft. Proper lengths listed here: https://www.jeepforum.com/forum/f310/...06/index2.html

Also, 4Lo does lock out the progressive coupler, forcing the front driveshaft to turn.

Are all the tires the same size? Running different sizes between front and rear will roast the coupler fairly quickly as it does its best to keep all 4 rotating at the same speed all the time.
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post #3 of 10 Old 02-13-2019, 08:51 AM
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^ While I agree with checking what @HarryH3 mentioned, I wouldn't do that first.

To my knowledge, most Overland's came with the double cardan u-joint front driveshaft, however if this particular WJ came with a CV joint style front driveshaft it's entirely possible that it was removed at some point due to the CV joint failing.

Check that there is a front driveshaft installed, if there is then start looking at the CV axles.

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post #4 of 10 Old 02-13-2019, 10:13 AM Thread Starter
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Thanks guys.

Just went out in the snow, got the rear end stuck in snow in 4HI and left the front tires on dry concrete. Moved it to 4Lo and to worked like a charm.

So start with some fresh fluid?
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post #5 of 10 Old 02-13-2019, 10:14 AM
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Also, itís imperative to use the right fluid in the 247. I get mine from the dealer for $14.00 a bottle. It takes 1.5 bottles to refill.

I had my front axel rebuilt a few months ago. Since then Iíve been using the AWD as much as possible.

When I take it to off road, I only use AWD unless Iím trying to go up a rock hill.

AWD works perfect in thick mud and dirt hills. Itís really smooth on hills. When I hit bumps on hills, it sort of glides me over the bumps. The same hill in 4WD, it shoots me over the bumps and slams me down so the bump smashes into my skid plates..

You do have to over maintain the Quadra drive parts to keep them working. You canít neglect maintenance at all. When AWD is working right, itís truly amazing off road. I just wish AWD had a low range.

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post #6 of 10 Old 02-13-2019, 01:59 PM
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If it's really low on fluid then perhaps the gerotor can't pressurize. But if it has plenty of fluid, even ATF, it should still work. They stopped using ATF in the 247's because owners complained about the noises that came from the coupler. The special stuff is even more slippery than ATF, and quiets the clutches down. If the case is full and doesn't work, then it's time to hit the junkyard for another t-case. I don't think that changing the fluid will help at all.
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post #7 of 10 Old 02-14-2019, 08:54 PM Thread Starter
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I swapped fluid. The stuff that came out was black. Certainly adequate fluid level though. The new mopar 247 fluid was nice and clear.
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post #8 of 10 Old 09-22-2019, 05:10 AM
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Hi I recently purchased an 04 overland and im having the same exact problem and ive been searching everywhere for the solution. I checked my TC fluid and it is full but very black and thin. Did the new fluid fix your problem? Im very interested to know how you fixed this. Thank you.
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post #9 of 10 Old 09-22-2019, 06:14 AM
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Unless you can get one cheap, I think a junkyard 247 might be a value risk over rebuilding with new bearings, gerotor, etc. Even if you manage to find a low mileage unit to swap in and it works for a while, you can't really know if it was maintained properly. Also, apparently, many early 247s (my '99 included) were run low on fluid due to a commonly occurring leak. There was a TSB and there have been past discussions about it in this forum:


Reliability is one of the reasons a 242 swap is so popular.

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post #10 of 10 Old 09-22-2019, 08:38 AM
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new member here just bought a 99 limited with 64k 1 owner im looking to swap out the 247 t case and replace it with a 242 hd
nothing wrong with the t case im just not a fan of full time 4 wd i also have a 2004 gc 4.0 with select trac and like that better myself
to bad you were not closer is sell the 247 to ya
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