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Unread 08-23-2009, 08:19 PM   #1
tsho86
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using a smaller spare tire on all time tran

I was curious to know that if it could harm your diff if you used a smaller spare than what you are running. I am not saying to run the small spare all the time i am just saying using it just to get you off the mountain. I have 33 12.50 R15 and the stock spare for my 98 5.9. Is it pretty much pointless to keep it back there if all it will do is harm my jeep? I know you can get away with it if your spare is pretty close to the same, but the stock spare is a far cry from a 33. Also if this has been posted i would appreciate sending me a link to the thread. Thank you!


Last edited by tsho86; 08-23-2009 at 08:30 PM..
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Unread 08-23-2009, 08:27 PM   #2
gatorayde
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Running that small of a spare with the 249 is not a good idea. Keep an eye out on craigslist or JF for a worn tire in the same size you have now for cheap.
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Unread 08-23-2009, 08:57 PM   #3
UltimatE
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You'll destroy your AWD system using a different sized spare on the NP-249 transfer case. Using a 29" tire will destroy it VERY quickly. You need to get a 33" spare.
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Unread 08-23-2009, 09:14 PM   #4
tsho86
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So, all that spare is doing for me is taking up space and giving me extra weight. Cool im glad i you guys could settle this. Yeah i'm sure i can find a pretty cheap used 33 to keep. Well i'm glad i didn't get a flat on boulder mountain a few days ago and put that dinky stock spare on. Thanks guys!
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Unread 08-23-2009, 09:21 PM   #5
Kruzin
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Yea, 249 tcases are very sensitive to mis-matched tire sizes. Even un-evenly worn tires can mess them up, so it's important to rotate your tires regularly.
Running a 29" spare when the rest are 33s will trash it up fast.
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Unread 08-23-2009, 09:24 PM   #6
UltimatE
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Quote:
Originally Posted by tsho86 View Post
So, all that spare is doing for me is taking up space and giving me extra weight. Cool im glad i you guys could settle this. Yeah i'm sure i can find a pretty cheap used 33 to keep. Well i'm glad i didn't get a flat on boulder mountain a few days ago and put that dinky stock spare on. Thanks guys!
No, you can't even use a used 33" tire, especially if it is from a different manufacturer.

AWD systems are very sensitive to differences in tire diameter. Thats why it sucks to get a flat on a Subaru, or other car with AWD. You have to buy 5 new tires.
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Unread 08-23-2009, 09:33 PM   #7
tsho86
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wow, i knew they are pretty sensitive, but not that sensitive. I am just not sure about these all time trans. They have their fair share of flaws.
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Unread 08-23-2009, 09:35 PM   #8
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Yeah most people swap a 242 or 231 in their place.
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Unread 08-23-2009, 10:05 PM   #9
UltimatE
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Luckily its the transfer case that is the AWD system, and not your transmission. Search for writeups on how to convert to a NP 242 or NP 231. I would go with the 242 so you have the option to use 4x4 on the street.
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Unread 08-23-2009, 10:37 PM   #10
tsho86
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yeah, i think that would be the best way to go. I will consider the NP 242, ive heard good things about it. Actually most the guys i know that have the 98 zj do the swap and do it with the 242 so you are right on with that suggestion.
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Unread 08-24-2009, 10:59 AM   #11
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Tire size is not an issue if you have a full size spare and do a five tire rotation from the time they are new.

Rotate every 6k and include the spare in the rotation as well as cross rotation, that is the right front goes to the spare tire location, the left front to the right rear, both rear tires go straight forward and the spare goes on the left rear. Most shops no longer even know how to do this. This keeps tehm even and teh spare within the tolerance of the TC.
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