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by BEGA1187 on September 16th, 2008

BEGA1187

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Is the H2 a full-time 4wd vehicle, & if so...Why? It would seem that GM would have went for the sensibility of a on-demand 4wd... The weather in most of the usa doesn't warrant full-time 4wd... Thanks

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  • by Elwood on June 23rd, 2009

    Elwood

    All hummers, from the original HMMWV to the H3, use a center differential. This makes them all AWD, not 4WD, during normal use. As soon as the operator switches the center differential into a "lock" mode, the vehicle becomes 4WD (like an early model Subaru 4WD). This locking increases tire wear and decreases traction and mileage on smooth dry roads. But it increases traction and reduces wheel spin on slippery surfaces.

    Comments

    • The differential does not determine if the vehicle is full or part time 4x4. This is done in the transfer case. When the hmmwv is shifted into lock range it locks the front and rear differentials together so they both pull the same. Only the hmmwv and the H1 have independent rear suspention and geared hubs. The H2 an H3 are just hmmwv bodys on a chevy tahoe frames or as I call them Humhoes.

      63strole

      by 63strole on June 23rd, 2009

    • The Center Differential IS THE SAME THING as the Transfer Case. It is a differentially-geared 2-gear lock. You are thinking I was referring to either the front or rear differential.

      Elwood

      by Elwood on June 23rd, 2009

    • Yes I was because I've never heard a transfer case called a differential. I work at an Army depot repairing hmmwvs.

      63strole

      by 63strole on June 23rd, 2009

    • Have they ever gotten around to teaching drivers how to use Brake-Trottle-Modulation to lock the front/rear diffs for ascending obstacles? (Those Zexel-Torsen diffs are wonderfully versatile things!)

      Elwood

      by Elwood on June 23rd, 2009

    • I test drive them after repairs are made but not with a rider. Tough as nails and can go most anywhere the trail is wide enough. And yes those locking diffs work quite well.

      63strole

      by 63strole on June 23rd, 2009

    • Sounds like you don't know what I'm talking about, regarding BTM. That means (sadly) the military doesn't teach its HMMWV users how to use one of the best features of the stock vehicle. Look up the technique online, and try it the next time you're behind the wheel....

      Elwood

      by Elwood on June 23rd, 2009

    • I understand that the diffs lock under acceleration and release on coast but I'm not trained by the military so I'm unsure of the technique you discribe.

      63strole

      by 63strole on June 23rd, 2009

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