Re: tuner or gears for a hummer on warrenty
4.88's really wake the H2 up in terms of acceleration and have definitely helped towing my boat. 4.56 and 37's will be close to stock, but if you add larger tires or any additonal weight you'll wish you went with the lower gears. The lower gears also help for crawling and descending on the slick rock trails in Moab. 
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2005 Black LUX
37x13.50R17 Toyo MT
Torsion keys. 2" rear coil spacers
2" wheel spacers
In Tune I2, Air Raid Filter, Air Raid MIT, throttle body bypass, straight pipe exhaust
Cognito UCAs. Kryptonite UCA ball joints. Kryptonite tie rods. Kryptonite death grip Idler. Moog HD pitman.
5.13 gears. E-locker front
Bilstein stabilizer
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