Nice ride citiboy I love the blacked out look have my h3 that way!! And thanks for the good info Big2dabank I'll probably go with the 4.88s with 38 or 40s or would you say I should go with 5.10 gears with the 40s????

I think 4.56s are perfect for 37s and 4.88s are perfect for 38s. I am still running 4.56s with 38s and its a bit sluggish, but still plenty of power when I need it. I still tow occasionally an am not quite ready to go to 4.88s. If you plan on going to 40s I would go straight to 5.13s, possibly even 5.38s if you don't tow anything.

Here are a couple of quick gear ratio calculations for you.

For stock tires and gears;

(4.10 x 60mph x 336)/ 33.6 inches = 2460 rpm 3rd gear

2460 x 0.696 (overdrive) = 1712 rpm

For 37s and 4.56

(4.56 x 60 mph x 336)/ 37 inches = 2485 rpm 3rd gear

2485 x 0.696 (overdrive) = 1729 rpm

For 38s and 4.88s

(4.88 x 60 mph x 336)/ 38 inches = 2589 rpm 3rd gear

2589 X 0.696 (overdrive) = 1802 rpm

For 40s and 4.88s (I personally think this will feel bit sluggish because of the added weight of the 40s)

(4.88 x 60 mph x 336)/ 40 inches = 2460 rpm 3rd gear

2460 X 0.696 (overdrive) = 1712 rpm

For 40s with 5.13s

(5.13 x 60 mph x 336)/ 40 inches = 2586 rpm 3rd gear

2586 x 0.696 (overdrive) = 1800 rpm

For 40s with 5.38s

(5.38 x 60 mph x 336)/ 40 inches = 2711 rpm 3rd gear

2711 x 0.696 (overdrive) = 1887 rpm