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BTM in an H1 is a technique that forces the Torsen diffs to lock up. It also works with TT4 trucks, although it is much diminished in the 99-01 models. BTM will not force an open diff to lock up.
Even though I have front and rear lockers, I still use BTM to control the vehicle speed while moving over large rocks and such.
Scot Smith
1994 HMC4, Locked
Steering & Axle Express
Steering, Driveline & other Hummer Stuff
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