If you have a front and / or rear sway bar, disconnect them / it from - either both sides of the frame or both sides of the suspension. A bent sway bar can prevent getting a truck level. I have leveled a vehicle by shimming one side of the bar where it bolts to the body.


'66 C60 body, '97 C6500 chassis, '07 LBZ Duramax with Allison 1000
https://photos.app.goo.gl/cxwv1C6Ay2oxYH7u7