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On the "a" pillar, or on the edge of the door, there should be a sticker indicating the original tire size. If you change to another size other than the correct size, you will confuse your processor and could cause transmission fault codes. The gear ratio is dedicated to the load geometry for tire size and speed algorithm.
Tire size is critical on any jeep but especially so on ones with quadratrac transfer cases. If you run different size tires it will cause the fluid coupler inside the case to overheat and fail. (big$ to repair) Don't drive it that way and get a matching set of tires on there asap!!!
You need to use the same size tire that is now on your vehicle, the door label on a lot of Chrysler vehicles do not show the correct size, if your not sure the vehicle has the right size tires on it now you can ask your local dealer for a "options list" for your vehicle, they can get this with the 17 diget vin number off the door placard or the one on your dash visible through the windshield. If your vehicle is a all wheel drive you must have four tires the same size and tread depth, do not replace them one or two at a time.
215 75 15 for the 4.0L engine., 225 75 15 minimum for the 5.2L (318 CID) and 5.9L (in the
1998 Limited model only). These are the minimum sizes; larger sizes may
be applied per the owner's manual guidelines.
Need to know if you have a lift kit and what your gear ratio is it says 2000 silerado crew cab 4x4 long bed but is listed in 2000 jeep grand cherokee and need to know your size of rims and what you plan of driving on.
the tires & rims that come with your vehicle are designed to meet all the specs of your vehicle. When you change sizes and styles, you then need to get the computer re programmed with the tire changes you have made. It affects your speedometer, your transfer case, your fuel (mpg) and the performance of the engine to the wheals. Also you can damage your transmission and rear end. So my advise is to buy a high end tire that meets origional specs. Look at the Toyo's they are great tires, great performance and no alterations are needed. Pluss they look cool as hell so try that http://www.treadepot.com/ check this site out and call them, they have better deals on the phone and have fricking great prices on tires.
You should have the same size tires in the front and back. By having 2
different sizes, you are changing the gear ratios between the front
diff. and rear diff. You could wipe out the t-case especially if it is
full time 4wd.