Tire size for lift?

[vdrive502]

How big of tires on 20inch rims can I put on with a 4 inch lift?

[seven_point_three]

two wheel and four wheel drive are alittle different on the front end clearance. take a tape and measure from your fender down to your rim. take that and subtract from your new rim size. so if you measured 15'' and had 17" rims, then you have a 12" clearance. so the absolute highest you could go (without rubbing) would be 31" because 32" is touching. these are not the distances with you're truck, just an example...