how can I fit 33x12.5x15 tires on a stock 1994 F150 2x4? Do I need a lift kit? or maybe just 4x4 xlt springs in front? which I think are bigger than the 2x4 stock springs. Any advice would be appreciated>

 

You'd need a 4" lift for those to fit comfortably since it's a 2wd.

2x4 is a piece of wood, you've got a 4x2

The 4wd springs are pretty much the same if not identical to the 2wd springs. The reason for the 4wd being 2" taller than a 2wd, is because of the TTB 4wd axle. It makes the truck sit 2" higher, and the truck has 2" more lift on the rear axle to match.