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.
YES it does.
Yes.
yes 02-05 have torsion bars 06 and up have coil overs
You must crank the bolts on the torsion bar clockwise to lift the vehicle
No.
If it 4x4 you need to crank the torsion bars so no rubbing happens but you can easily put 285/70R17
Turn the adjusting bolts.
yes
no, they have strut style suspension.
jack up front end, drop both bolts out of the torsion keys, knock both bars out then put new keys in
the is a bolt right behind the transmisson that you turn
No, Chevy converted to a coil spring suspension for their GMT-900 trucks. (07 - 10)