I'm buying a set of 31" A/T's for the Jeep, would like to keep one of the current 235/75 r15's for a rooftop spare instead of having to buy a 5th tire. I know ideally we should run the same size tires all around but would it be ok to use it as a limp-home emergency spare tire? Or will this screw up a front or rear differential? In some cases we're more than 150 miles from home, and at least 75 miles to the nearest tire shop.
As usual, I find conflicting information. As far as I can tell, with my 249 transfer case kept in full-time, I should be ok for a short while but get it changed asap. Should be ok to get it home. Does this sound accurate?
I do not know much about the 249 bit as I've heard hundreds of times here. Jut get the same size tire or AS CLOSE as possible or you will be in trouble.
I'm sure someone with a 249 will chime in and say the same
It is not a good idea to drive on a mismatched tire for any amount of time, especially with an awd vehicle. Even on a fwd or rwd car you should make sure the drive wheels are the same size by swapping the flat tire with a good tire from the other end of the vehicle and putting the doughnut on the non drive wheels.
Ive got the 242, but from I've read here about the 249, you do NOT want to mix tire sizes, or even tire brands. Those TCs are extremely picky about tire height, and you will burn them up running different size tires. At the very least, scour your local CL for a good used 31, probably find one for $50 or less.
No effing way. You will kill that 249 fast with an odd sized spare. Especially with the early 249's. All tires need to be the same and do not remove the front shaft and drive it. That will kill the VC too.
With the 249 all tires must be the same size. That is the bottom line.
96-98 it's ok to remove the front shaft and it won't hurt the VC or roll. 93-95 it's not ok. The power split for 93-95 is 50/50 all the time. For 96-98 it's like 10/90 front to rear until the rear tires slip.
Polka is correct. Using a smaller or mismatched spare is very, very bad. You will destroy a 249 and if you have a traction aid like a locker or limited slip with any other transfer case, you'll destroy it as well. Do not do that. Buy the matching spare.
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