I have been researching all night, and i can't find any for leveling kit my 2011 silverado 2500hd expect for 5-7 inch lift or aftermarket torsion keys? Is there an option for just a 2 and a half inch front end suspension lift?

 

There's nothing wrong on using torsion keys. I know some guys have the Ready Lift leveling torsion keys and they didn't notice a change in ride quality. If you don't have shock extensions or you didn't get longer shocks, you might experience rough ride after installing t-keys.

 

Is the truck a 4x4, 2" maximum with leveling keys, friend of mine used MAXXcam leveling keys (you can find a modified indexed keys for less) on his 2012 along with sulastics on the rear leafs and it rides pretty good.

 

Yes torsion keys are your option, unless you have a 2wd, then you can do lift spindles. If you use the torsion keys, don't go past 2.5". 2" is ideal