Now that I'm rolling on 35's with 3.73 gears the speedo and overhead, etc. is all messed up. What do I ask the dealership to do. I heard it on here somewhere, but can't find it in the search. Is it pinion factor?

 

Take to them and have them set for "revolutions per mile" at 596 for a 35". I have mine done on Wednesday and confirmed the speed with a GPS unit. All is good. Took them about 30 minutes and cost me $45.00

 

Had to tell my dealer how to do it step by step. It is changing the pinion factor. It depends on your tire for the revs per mile. Check with the tire spec sheet. Mine were set at 598 for 35's yesterday.