What is the biggest tire i can fit on a stock 94 4x4 pickup? What is the biggest tire i can fit with coil spacers and add a leafs on this truck?

 

32/11.5/15s stock, 33/12.5/15s lifted that 2".

 

if i ran mudders vs. all terrains would i have any rubbing probs

 

I put 33x12.50x15 on 8 inch wheels on my 88 150. They hit a littel at full turn at the back of the wheel well. I put a 3 inch lift and 10 inch wide wheels, did not hit. I went bigger and bigger from there.
As far as the mud terrain and all terrain. Most of the time the AT's will fit better. Becuse the MT's usley have bigger side lugs.