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I don't have a lift on my truck, but I run 265's on my stock 97 ext. cab and there's still some room to spare. My guess would be to go with some 305's or 315's.
Ok i geting ready to lift my 1998 f150 with 3in body lift will 275/55/20 (32) look to small? What tire size sould i get?
I run 275/70/17 with no lift or t crank. Next tires will be 285's which is less than 1" height difference, but will look better overall.
Point being you have a 3" body lift and granted you are running 20" wheels, I would suggest a bigger tire. A buddy of mine ran 315's (35" height) on a 3" body lift and it looked excellent. Dont' know how 20's and 35" would look tho.