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post #1 of 7 Old 06-18-2013, 06:59 PM Thread Starter
Dubfire98
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Another np249 question

So I was out doing some backyard crawling today and I attempted to climb some logs I had cut. I got the front left up to the first log and started up and then only my opposing tires front and back spun and I couldn't climb up even in LO range. Since its full time 4x4, would I have to lock both axles the same diff lock or could I just get away with a rear locker?

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post #2 of 7 Old 06-18-2013, 08:18 PM
a70eliminator
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I'm going to try to explain whats happening, the tire that IS getting traction, only gets the same torque of the opposing spinning tire, if one tire is in the air your going no where, that's why we like locking differentials, ok that takes care of the front and rear axles side to side power.
Now the transfer case works very similar only front to back rather than side to side and the viscous coupler can distribute the torque a little better than an open differential. So for hard core crawling the 249 with open diffs is not much use.
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post #3 of 7 Old 06-19-2013, 01:49 AM Thread Starter
Dubfire98
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Well this is my daily rig and even tho I've got another crawler at my disposal, id like to possibly get a rear locking diff for the zj. My question is... Is this gonna be ok to do since its full time?
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post #4 of 7 Old 06-19-2013, 03:13 AM
Timo_90xj
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You can use any type of locker at the back with no issues, does no harm with the 4wd system or doesn't really affect handling much at all. If you have a D44a at the back, you don't have much choise on the lockers. IIRC aussie locker is the only lunchbox locker you can get for an open-carrier D44a, and no full carrier replacement lockers are available.


I wouldn't use an auto locker in the front though with the AWD, get a selectable if you like locking the front as well..

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,...

http://www.jeepforum.com/forum/f13/d...s-etc-1222317/


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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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post #5 of 7 Old 06-19-2013, 05:51 AM
Technohead
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Quote:
Originally Posted by Dubfire98 View Post
Well this is my daily rig and even tho I've got another crawler at my disposal, id like to possibly get a rear locking diff for the zj. My question is... Is this gonna be ok to do since its full time?
Yes.
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post #6 of 7 Old 06-19-2013, 10:43 AM
tucsonzj
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Quote:
Originally Posted by Technohead View Post
Yes.
this^

If you want to lock, lock the rear first. Follow advice above. If you want to lock the front, go full out and do something like an ox where you can select on and off for daily use and tail days.

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post #7 of 7 Old 06-19-2013, 12:33 PM Thread Starter
Dubfire98
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Yea id really just like to lock the rear for the occassional trail ride/snow storm. Although really in knoxville it only snows good two days a year if that lol. its my dd and my boat hauler so really its not a need, just a want. But thanks for the input you guys!
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