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Unread 03-28-2013, 09:08 AM   #16
ejschultz
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With open diffs, weather it's on the front or the rear, in 2 wheel drive, it shouldn't matter. Up front, it'll just work. It'll probably throw off the steering a little though. Out back, it'll become the drive wheel. It has to spin slightly faster to keep up with the non spare tire. This can throw off the speedometer. Even in full time with a 242, short distances shouldn't matter. I can see long term effects like stretching the chain if you drive it like that for an extended period of time. You would want to keep the transfer case unlocked though. You could damage it in part time with a smaller wheel up front or out back.

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Unread 03-28-2013, 10:54 AM   #17
MyKeyB
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1997 ZJ 
 
Join Date: Feb 2013
Location: Youngstown, Ohio
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Quote:
Originally Posted by AmishFury View Post
you people with factory full size spares disgust me... i had to go find a rim to get my full size spare
From the build sheet:
TBBP Full Size Spare Tire
TBLS Inside Mounted Spare Tire
TRDP P225/70R16 All Season Tires
TZAS Goodyear Brand Tires
WDNP 16X7.0 Aluminum Wheels
WKBP Matching Spare Wheel
WLZC All Aluminum Wheels

lol.
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Unread 03-28-2013, 02:35 PM   #18
Adam86
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1998 ZJ 
 
Join Date: Dec 2012
Location: Birmingham, England
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Well l made the mistake of running my spare tyre on the left front for maybe 250 miles with the 249 tranny. Can't remember the sizes but the spare was about an inch smaller in diameter. I replaced the tyre but it was too late.

But what actually happened is l killed my front diff and propshaft not the tranny. The diff became noisy and clunky when turning and the prop failed causing the Jeep to violently shake. Couldnt drive above 15mph. Replaced both and it was back to normal.
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Unread 03-28-2013, 07:39 PM   #19
Texas ZJ1
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Okay, let's review....

If you have the 249, all the tires must be the same size. If not, you'll ruin the transfercase.

If you have the 242, you'll still want the tires to be the same size yet, a slightly smaller or larger tire will work for a short period of time.

Hunter
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Unread 03-28-2013, 11:03 PM   #20
dnuccio
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Quote:
Originally Posted by Texas ZJ1 View Post
Okay, let's review....

If you have the 249, all the tires must be the same size. If not, you'll ruin the transfercase.

If you have the 242, you'll still want the tires to be the same size yet, a slightly smaller or larger tire will work for a short period of time.

Hunter
this post should be added to the FAQs
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