It depends “which” 33-inch tires you are getting. If you get a set of 285/70R17 Rubicon takeoffs, which measure 32.7 inches, you won’t need a lift.i have a JL Willys sport...I want to put 33s on it at some point..Was thinking about a 1 1/2 spacer lift ..but all this talk of losing 2 to 3 mpg...Would a body lift of say 1 or 1 1/2 in not cause the extra drag..Im not climbiing any rocks..light iff road..maul crawler..i body lifted a cj7 w 2 hockey pucks on my first jeep back in 86..looked great..cant remember any mpg difference..not sure i ever compared before and after
For larger “33s”, you will need a 1-inch in lift.
A 1-inch spacer lift and 33s is going to lower your fuel economy by around 1 to 1.5 MPG.
Anything larger than 33s will start affecting your 3.45 final drive ratio.