TRUXX has one that levels out the front and adds to the rear also.
http://truxxx.com/hummer_products/405020-hum.htm
A couple guys are running this kit here without issue. It has ffront lift and rear coil spacers as well. It raises the front by 3" and the rear to 1.25".
this guy has a nice rig with this kit. You can PM him for questions on it.
http://www.elcovaforums.com/forums/s...ad.php?t=36856