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Using 4x4

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Mopar500
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Joined: 21 Feb 2006
Location: Colorado

PostPosted: Sat Apr 15, 2006 7:41 am    Post subject: Reply with quote

The impression I have is that the full-time option has more of a rear wheel orientation and the part-time has more of a 50/50 split. I didn't think there was a difference in the part-time, from one transfer case to another. The only difference is having the full-time option.
Which, by-the-way, I have yet to use.
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Shimma
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Joined: 23 Mar 2006
Location: Wellington, New Zealand

PostPosted: Sat Apr 15, 2006 6:43 pm    Post subject: Reply with quote

Mikerhona,that sounds nice.Dual fuel?,do you guys have lpg,over there?Is that what you are using?
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JeepinNH
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Joined: 13 Sep 2005
Location: New Hampshire

PostPosted: Mon Apr 17, 2006 6:55 am    Post subject: 4x4 Reply with quote

If I read it correctly full time is just that, you can run it full time. Why you would want to run it if not needed with gas prices so high I don't know. Part time seems to lock the system in which of course needs to be on something that the tires can slip on. On a side note, I just found that my 99 had a very close to seized passenger side axle u-joint. For now I lubed it until I have time to replace. I noticed it shuttering at low speed corners and now that I can open my windows (spring :-) ) I could hear it making noise. I'm not looking forward to replacing it but at least it's cheap to fix.
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Mike

Present: 99 Cherokee
Past: 86, 87 Cherokee; 94 Grand Cherokee
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roclmbr
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Joined: 31 Mar 2006

PostPosted: Wed Apr 19, 2006 6:03 am    Post subject: part-time Reply with quote

The part time means that it is in 4 wheel drive, but only if the wheels start to spin. If the wheels are not spinning you are still in 2 wd, that is why you can use it at high speeds. The full time is locked into 4 wheel drive. The Lo is locked in 4 wheel but at a different ratio. With the older transfer case you are supposed to stop the vehicle to switch into Lo, with the newer ones you are supposed to be moving about 3 mph to switch in.

One interesting item for the older Cherokees is that if you do not have at least 2 psi more in the back wheels than the front, then you may get a grinding and klunking noise in the system. Don't laugh but I had this problem with my 97 Cherokee and the guy at the transmission shop told me about the problem. I adjusted the air pressure and the problem went away. I changed the air pressure to test it and the problem came back. I keep the back tires at a higher pressure and have not had a problem since.
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JeepinNH
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Joined: 13 Sep 2005
Location: New Hampshire

PostPosted: Wed Apr 19, 2006 3:51 pm    Post subject: 4x4 Reply with quote

roclmbr, you actually have that backward. You have to take the name literally. If it's in part time you use it part of the time not on dry pavement because the system is locked. Full time (not all Jeeps's have this) you can use whenever as in use it all the time. Tire pressure and tire sizing is a big deal with any 4x4 that locks the wheels, any difference from front to back/ side to side will mess with the system and wear parts out prematurely which is why you should replace all the tires at the same time. The back side of the driver's visor should list how to use the 4x4 if memory serves me.
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Present: 99 Cherokee
Past: 86, 87 Cherokee; 94 Grand Cherokee
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