That's quite a rig you've built up. The most I plan to go with is a 2" lift since I don't do any serious rock crawling or gnarly roads (Anymore. I took my 4Runner places by myself that I shouldn't have. Luckily, never broke down). Unfortunately I have 20" wheels and don't want to spend the $ to replace them with 17s, so I'm thinking of going to 275/65/R20 KO2s. They're 34" diameter and would give me another half inch or so of clearance.
I've got the 3.42 gears and will stay with them.
Did you notice any difference in mileage after the tune? I get 18-18.5mpg and don't know how typical that is for a 4WD with 3.42 gears. So far I'm happy with the power but will have to see after I put on the bigger tires. Did you run any performance times before and after the tune? I've got Torque that will give 0-60 and 1/4 mile times, so I plan to test it before and after tires, then decide on a tune or whatever.
Did you change your speedometer calibration with the tire changes? Is that a bit deal?
Thanks for the info.
Scot