[ Home > Accessories > Vehicle Enhancements > Heavy Duty Halfshaft Upgrade Kit ] Beef up your drivetrain! Bigger tires? More powerful engine? These are the halfshafts used on the 12,100 lb. GVWR trucks as well as the H1 Alpha. Complete kit and illustrated instructions. All new AM General parts. $2,500.00 Copyright© 2003 - 2012 BlueHummer Outfitters All rights reserved. Hummer brand is registered by GM and/or AM General. BlueHummer Outfitters is neither affiliated with nor endorsed by GM and/or AM General. Last Update: May 21, 2012