The H1 Alpha model was introduced in 2006 and got the Duramax diesel engine and Allison 5-speed transmission for much more power. Previous models used the 6.5L "Optimizer" engine that was criticized widely for lacking power. The new engine/trans combo produced enough additional power that GM had to recalibrate the torque management to protect driveline components.
Other major modifications included the use of special high-strength steel in the chassis frame, a more powerful steering gear; quieter axle differentials, redesign of the geared hubs to use quieter helical gears, new induction, exhaust and electrical power systems; and re-engineering of the fuel supply and filtration system. I believe the 2006 models also got an updated interior.Whats the difference between the hummer h1 and the hummer h1 alpha?H1 Alpha is better!
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