anybody runing 31" with stock gears? i would like to but people tell me i can kiss 5th goodbye!  would putting a header and k&n filter get me some power back?
I ran Goodyear Wrangler MT/R's in 31X10.50 on stock gears, until recently. On steeper mountain roads, like this, you can kiss FOURTH goodbye. On flat terrain, though, it still worked OK in 5th. I do have the Calmini header, and the K&N filter, on my 16-valve.
When I put the Anvil, with the ARB Air Lockers, I also went to the 5.83 R&P's - this put the speedometer and odometer back within 1/2 MPH at 65 MPH (which is more accurate than my 4-door Kick with stock-height tires).
The 5.83's helped, but she's still pretty gutless. I'll be trailering her to Moab next month (the Eisenhower Tunnel on I-70 is a heck of a pull).