I just noticed a screw in my rear drivers side tire. I have a good spare that has 0% wear that I can throw on until I order new tires. Will running a new tire with 3 very worn tires cause any problems? I know someone at work that had problems with this but I think he had full-time AWD on his grand cherokee. I have part-time. I plan on ordering new tires anyway but need to throw this spare on ASAP.

Thanks

It will be fine for short term use.

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99 TJ
71 C101
04 KJ
03 SFA KJ Sport
LOST JEEPS So-Cal

OK, so there IS something not good about running a new tire which essentially has a larger diameter than my other worn tires? I drive about 30mi round trip a day to work on highway at about 70mph.

Unless the tires are totally worn out, there is still less than a inch difference in height so it isn't a huge deal. Only problem I can see it causing really is a pulling to one side if run on the front. The rear you shouldn't notice a difference and the rear diff will not care. It is better to have them all closer in size so just get it fixed as soon as you can.

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99 TJ
71 C101
04 KJ
03 SFA KJ Sport
LOST JEEPS So-Cal

thanks. I have a plug kit so think I will just plug it and order new tires. At least I have the full size spare while I wait.

Big wear differences might make steering weird in some circumstances, so put the new tire on one of the rear positions, with the two closest matched treads up front.

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06 Sport stock so far

do you have trash-loc?

if you have an open differential in 2wd it should be no issue