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Yes.
No, The Silverado 1500 does not have torsion bars it has coil overs and shocks. All 4wd silverados have them and the 2500HD 2wd also does.
You must crank the bolts on the torsion bar clockwise to lift the vehicle
Turn the adjusting bolts.
YES it does.
Take the truck to your local Chevy dealer and have them adjust the torsion bars to lift the front and then do a realignment. About 100 bucks. New torsion bar keys are not needed.
torsion bars only exist on 4WD dakotas....2WD have coils
Two wheel drive trucks have torsion bars to help adjust the ride of the vehicle. They can be turned up or down based on the vehicle's load.
There is a bolt near rear of torsion bar (the end closer to rear bumper) which will increase or decrease the tension on torsion bar when you adjust bolt.
jack up front end, drop both bolts out of the torsion keys, knock both bars out then put new keys in
No, Chevy converted to a coil spring suspension for their GMT-900 trucks. (07 - 10)
as the rear is torsion it is not straight forward. the torsion bars have to be removed one side at a time, with the torsion bar out simply adjust hub the required amount and replace torsion bar. then do the other side. this can be hard as the bars can be difficult to remove. best left to professional should cost between £60-£100