I have put a Cummins 4BT in my mid 70's Chevy 3/4 ton 4 WD truck. Everything looks good, but I am concerned about clearance between pan and front axle--right now it looks like about 2" which I am sure is not enough. I am quite certain I need to add a lift kit. Has anyone had experience with this truck and this conversion? I was thinking 3" would be enough--any ideas to the contrary? Also, has anyone had experience with different brand lift kits? I've never lifted a truck--whose kits are the best and worst in your estimation? Thanks for your help. Dan Smith, Tabor, SD