I am not new to owning my 87 K-5, just new to having money to build up on it. That being said I know what I want to do with my Blazer (weekend toy with the ability to be driven daily and do medium difficulty trails in Virginia ideal 4" lift and 35" tires) I want to drive it to the trails and drive it back. No trailers here. Right now the truck is sitting on 31x10.50R15 Savero? all terrain crap tires with the belts showing through, it has no lift, but it has a ton of room still left and even with full articulation they are not really near rubbing. Will 33x12.50s fit on it with the right backspacing on the wheels or is the 32x11.50 the max? I wont be doing any serious off roading for quite a while so I am not too worried about the tires rubbing unless they will do it when street driving. Also as far as axels go I hope to someday upgrade to 14 bolt/Dana60 combo but dont have the money right now. Is it worth it to find a 12 bolt from a 70s Blazer with a cheapo locker and have it installed next year when I lift it or will the little 10 bolt do fine for now as long as I dont go too crazy and get too throttle happy? I just want something to get me by until I can afford the big stuff. Is there much difference in the 1/2 ton 12 and 10 bolt rears? Thanks for the help.