i am going to put a 5 inch susp lift on my truck. i cannot deside what size tire i want to run.... i can get a set of 37in pro comp xterrians pretty cheap but i dont know how tight they will be.....

 

i wouldnt think you would have any problems with a 36 or 37 if you can fit a 315 almost stock.

 

I have seen 38's on a 3.5" lift ..

You may need to do some minor clearancing as the fender wells just aren't large enough for that diameter tire.

I have a 3" lift with 35's (315's) and have NO Problems at all ... i've put 38's on and have no issues (didn't drive that far.) an i'm looking for a set of 38's now.

Just keep in mind when you go that large, all SORTS of new problems start creeping in.

 

I have a 5in lift and my 35's are way too small. I say go with 38s, at least thats what i want to upgrade to next. I love the new Mickey Thompson ATZ's they look awesome, try those out.

 

I have 37's with 6" and I can easily make them rub.....I wouldn't go bigger than a 36 with 5".

Fender trimming or not, if you compress the suspension with the wheels turned, it'll rub.