TRUXX makes a key and shock and block 3/1 kit for 200 could probably find one cheaper... bosses 2500 09 runs 35's on it. looks pretty tough and easy 2 hour untrained install
You got a LMM . LBZ is what LMM replaced. I would just crank the bars at first.
So its not a LMM engine? I thought the LBZ was the interior package?
Maybe LTZ ?
Don't do that. You need that inch for down travel of the suspension. If you max out it will be the roughest ride of all; every time you go over a bump you'll feel the front suspension bottom out.
If you want more you'll need a Cognito upper control arm and keys to go with it but only use the keys with the arms.