MORE INFO...
These adapters will work on all H3 & H3T transfer cases (base or adv. pak). Installation is a breeze...simply un-bolt your stock driveshaft...bolt the adapter to the front output flange of the t-case...and bolt-on a custom shaft of your choice. They are 1/2" thick steel, and come with mounting bolts. I just got a batch of these done today...sort of testing the market at this point. The price is $99.00 shipped via USPS (while supplies last).
Both 06H3 and myself got our shafts from Tatton Driveline in Utah but, you can get a shaft made by any driveline shop. You need to specify a 1310-series CV, (which is a very common joint used on Jeeps, Fords, and Dodges). It has a 2" center pin and 3.5" bolt circle. You can also get standard (single u-joint) flanges in this same bolt pattern but, I would recommend the CV for the Hummer due to it being full-time 4WD. When you measure for your new driveshaft, make sure to account for the 1/2" thickness of the adapter. And obviously you'll need a slip-shaft at the front end, so you can get it installed. I believe the installed length is around 30" but measure to be sure.
This is a nice upgrade for ANY H3, although Rancho-lifted rigs might reap even more benefits. The Rancho kit puts extra angle on the front driveshaft, and often times the stock rubber-boot on the CV will rip and destroy the joint. This same shaft can be also be used on a Dana 44 should you decide to go solid axle someday! The 1310-series CV uses (2) back-to-back rigid u-joints (no boot). It has grease fittings. It can be rebuilt at home from parts bought at any AutoZone or NAPA.
If you want one...hit me up with your complete shipping address and direct email. I will send you a PayPal link for fast, easy, secure payment.