36s on 20s
 

I'm gettin a set 36 in iroks on black 20s. N was wondering if stock gears on the 03 fx4s would pull em?

I assume you have 3.73 gears? They will work but something around 4.11 would be better. Smaller rims would help out a lot also. You want a lot of sidewall on your tires for off road. Either 16" or 17" would be much better.

Terry

3.73s will turn them, but 4.56s would be your best bet. 4.10s work ok if your just a pavement princess

2x 4.56 then, if you want 37's it would be just about stock gearing if im correct...