My dad passed away recently and I am thinking of buying his 1990 Ranger XLT from my mom. He never took it off-road so it has stock sized tires on it. It looks like there is enough room in the wheel wells for 30" or maybe 31" tires. Will these fit ok? The truck has 15" wheels but I don't know if they are 6", 7" or 8" wide (I will find out which) but I have no idea of the wheel backspacing. So my questions are how tall a tire I can fit and how wide? I'm thinking 31" x 10.50" would be ok. Oh, this truck has the 2.9L V6 (140 hp). Will larger tires pose any problems with the tranny? Could any other problems pop up because of larger tires? The reason I want larger tires is 1) to look better and 2)to increase clearance & off road performance.