They might clear on a 6" rim but on an 8" the fronts would be iffy without some trimming, the rears won't be a problem. Your math is correct but an 8" rim is too wide for that size tire. While the section width is wider than 8" the tread width is less- the rim width should not be greater than the tread. I would use either a wider tire or a narrower rim. Also you don't say what offset/backspacing your new rims will have- it makes a difference. The more backspacing the closer the inside of the tire/rim is to the frame/suspension. Too much & it will rub. Conversely the less backspacing the farther out the outside tire/wheel rim will be & the more likely it will be to hit the fender. 235/75R15 is the stock tire size that came on early Troopers with 6" rims with 3.75" backspace. Your LUV probably came with a similar rim but in 14" and about a 26"-28" diameter tire. You will need to use a similar backspace to clear on the inside, which means with an 8" rim the outer edge of the wheel/tire will immediately be 2" farther out than your stock setup plus 1/2 any additional diameter. Take a block of something (foam or wood or...) the added thickness & check the clearance between your current tire/rim on the outside corner. The problem areas are the bottom front and rear corners of the front fender at full lock turn & full compression. If your test spacer block clears with room to spare then the new tire/rim probably will also. If they don't clear the front portion of the fender can be trimmed more than the rear. A suspension lift will help clearance under normal driving but not at full compression, a body lift moves the problem sheet metal up more out of the way.
_________________ '78 Chevy LUV,1.9,4sp,headers,31's,SAS Dana 30,Dana 20,SOA rear w/Aussie Locker, rough body, bought new 12/4/78. '87 Trooper,2.3,5sp,headers,31's,ball joint flip & spacer,Aussie Locker rear,Superwinch hubs,brush guard w/5.5K winch,more to come.
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