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Unread 03-11-2006, 04:13 PM   #1
frenchfriedshoe
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Help, need info on 4wd, info inside

I currently own a 1998 Jeep Grand Cherokee Laredo limited, 5.2 v8.

While making sharp right or left turns, the wheels grab. I am unable to take the car out of 4wd, However, with no manual I am unsure if it is All-time, or if there is a way to remove it. I understand the wheels will grab if it is all time 4wd, if anyone has any insight in how to turn it off, or if it can be turned off, I would greatly appreciate it. Thanks.

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Unread 03-11-2006, 04:25 PM   #2
Woody
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You have the NP249 Transfer case which uses a viscous coupler to send power to the front wheels. This is a full time transfer case and you cannot take it out of 4x4. When the front wheels grab like you are describing the viscous coupler is shot. At this point you have a few options. You can take your ZJ to a repair shop and pay about $1000 or so to get it fixed. You can buy the part for about $450 and do it yourself, or you can get a different transfer case that does not use this part for about $300 and swap it in.

It's all up to you and what you want. Note that rebuilding your case is probably the only way to keep the AWD like you currently have. Some folks like it, some don't. The NP242 T-case has an 4 wheel drive full time position which is similar, but not as quick and reactive like your current case.
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1985 1 ton K-5, Detroit diesel, 36" tires (going bigger when money permits), 4-speed manual swap, Rockwell T-case, Hybrid lift, 12.5K winch.
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Unread 03-11-2006, 08:44 PM   #3
frenchfriedshoe
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Quote:
Originally Posted by Woody
You have the NP249 Transfer case which uses a viscous coupler to send power to the front wheels. This is a full time transfer case and you cannot take it out of 4x4. When the front wheels grab like you are describing the viscous coupler is shot. At this point you have a few options. You can take your ZJ to a repair shop and pay about $1000 or so to get it fixed. You can buy the part for about $450 and do it yourself, or you can get a different transfer case that does not use this part for about $300 and swap it in.

It's all up to you and what you want. Note that rebuilding your case is probably the only way to keep the AWD like you currently have. Some folks like it, some don't. The NP242 T-case has an 4 wheel drive full time position which is similar, but not as quick and reactive like your current case.

Thanks for the quick response. How difficult would it be to buy the part and replace it myself. I'm more of an electronics kind of guy, I have access to a machine shop, pretty much any tool I could need, and a lift. Would this be something I could complete at home, or would it require something more indepth. Also, what would be the long term effects of continuing to drive like this?
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Unread 03-11-2006, 09:15 PM   #4
Woody
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You'd want to use the search function as someone did this recently. I don't remember who though. You will have to remove the transfer case, open it up and replace the VC. It would probably be easier to do at the machine shop.

Driving like this very long will wear out tires, front or rear axles, suspension components, steering components, and other fun items. Don't do this very long.
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Unread 03-11-2006, 09:42 PM   #5
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I'm not sure if anybody around here did it, but somebody did find the procedure. It's really not too bad from what I saw. Remove driveshaft, drop TC, take out a few bolts, pop out a couple C-clips, then slide out old, and slide in new. It's all one unit. Not a full TC rebuild, thank god. I'll see if I can dig up the procedure.
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Unread 03-11-2006, 09:47 PM   #6
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Here ya go

http://www.masoncomputing.com/np249/
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