Owner gave me permission to post this. I did the install about a week ago at Tire Discounters in Marysville
About a month ago, I had a guy bring in his 2006 Duramax with a 2 inch Torsion Key and 1 Inch blocks for an Alignment. Did the best I could with the factory Eccentric Bolts for Camber but still had a bad Negative Camber even maxxed out (2 inch torsion key but the bolts were close to maxxed). On top of that the Steering components were starting to suffer from the lift.
So talked to him and told him what parts to order and what needed reinforced. He went above and beyond and ordered a full Cognito 7-9 inch Lift Kit with several up graded goodies like Cognito Upper Control arms.
The kit basically dropped the Front/Rear/ and Torsion bar crossmembers, replaced the spindles with taller spindles that repositioned the tie rods to a straighter line with the idler/pitman, replaced the idler with a beefier support bracket, and dropped the front diff down to allow better axle angles and added a stronger front shaft with a double u-joint setup.
Before is sitting on 33's on 18 inch wheels that rubbed badly.
After is on 35's on 20 inch wheels that have almost 2 inches all around from lock to lock.
Oh and ride quality is close to factory since everything is repositioned and nothing is really stressed.
http://i268.photobucket.com/albums/jj32/Formula98/Duramax_zpsfeabb2a5.jpg
http://i268.photobucket.com/albums/jj32/Formula98/Crossmember1_zpsd9d5b010.jpg