Speedo after lift
 

I have a 91 XJ, 4.0 with the auto trans, 4.5 lift and 31 10.5 15 Nexen Mud tires. What do I need to make my speedo right? Thanks.

http://image.fourwheeler.com/f/90313...meter_gear.jpg
change this to the correct one, google search.

Buy a gps. lol. Going from a 225, 75r15 to a 31x10.5" mine is only off by 6mph at 70. Meaning when I show 70 mph on speedo I'm doing 76 per my Garmin gps. At 35 only off by like 2 mph. So i wouldn't worry unless you go up to a 33" tire.

LOL, a gps, never considered it. But what is the right VPS for the output, that may be cheaper than a gps.

I resisted changing the speedo gear on mine because they cost about $40. I found a used 37 tooth gear on ebay for $18, so I pulled the trigger. I have a GPS and that's how I verified that with my 35's and 4.56 gears, it's correct now, but it's nice to have the speedometer and odometer correct.