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Originally Posted by Stellar
Both..You don't have to have a tuner, but it will recalibrate your speedo for your tires / gear setup, add a lil hp/tq, and give you a few other adjustments that can be beneficial. IMO 4.88 gears is the ideal setup for larger tires, better acceleration and off roading for the Hummer. Especially for here in Moab, UT  |
i was always under the impression to shy away from 4.88s for any kind of off roading, and dont think about it for serious off roading ( MOAB and such)