I just got another car..but need help and advice... - JeepForum.com
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post #1 of 3 Old 09-02-2001, 03:38 AM Thread Starter
Type S
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Join Date: Sep 2001
Location: Seattle , WA , USA
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I just got another car..but need help and advice...

I bought a 1992 Jeep Cherokee from my frined who gave me a good deal and he is the first owner of the car..that car is clean..has not accident at all..drives pretty good..the exterior and interior is good and clean...My question is that my frined told me that if the 4X4 mode is on.. i can not drive over 55 miles.. that will damaged the 4X4 system...is that true??? and can i switch to 4X4 at any speed? or there is certain speed..need advices??

2001 Acura Red CL Type S. <--Canada Model
1997 Honda Civic EX.<--Wife's
1992 Jeep Cherokee Sports edition. V6 . 4X4. 4 Doors
1996 BMW M3 <---Saving money to buy..Coming soon...Hopefully
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post #2 of 3 Old 09-02-2001, 03:34 PM
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You can drive at highway speeds in 4x4 high range, but I don't think that you really want to go much faster than 55. If your in 4x4 high on the highway, there must be a reason for it - like the roads are really crappy, with about a foot of fresh snow, and your pulling a 4 place snowmobile trailer loaded down. You can shift in and out of 4 high at any speed while you are moving. To go into 4x4 low range, you really should be stopped, and top speed would be about 35mph.
There is no reason to have 4x4 engaged on dry pavement, and could cause wear on the system.

By the way, it's a Jeep, not a car!

89' YJ - 4.2 - NV4500 - NP231w/sye - 1" Body Lift - 2 1/2" Rancho Suspension Lift - 31" Firestone MTR - AR Outlaw II - Tomken Bumpers F & R - Warn 8000 front - Warn 6000 rec. mount rear - FlowFit Seats - Tom Woods Rear & Custom 2" front driveshafts
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post #3 of 3 Old 09-13-2001, 01:34 PM
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To expound on the topic, the NP231 is a chain-driven transfer case that really isn't designed for high-speed operation. It just plain isn't good for the chain. It is OK to shift into 4H at any safe speed. The xfer case will NOT shift into 4L unless you are stopped or nearly stopped.

Also, the NP231 is not an all-wheel-drive xfer case, but an on-demand case. There is no differential in the xfer case. So, if you're on dry pavement and you turn while moving, you get a difference in rotation between front and rear driveshafts, and due to tire traction, the driveline gets bound up. This is the fastest way to snap U-joints, axle shafts, steering knuckles/joints, or the xfer case itself.

Off road, you get wheel slippage, so driveline binding doesn't occurr as severely.
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