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H2's use the 14 bolt semi-floater corporate GM axle. These have been used extensively in GM 3/4 tons from about 1981- current. As far as gears, I'm sure Hummer's website lists the available ratios.
Are they strong enough for a Blazer? Yes. There are a few here on CK5 that have used them with success.
They are not as strong as the 14BFF, but much better than a 10 bolt.