I know its not a 2500 but, I have a 08 Silverado 1500, I like the Chevy's but they are all so low?? In the 08 they no longer have the torsion bars, they went to coil springs in the front. I added 3/4 on springs to the rear and then added a leveling kit to the front end for a 2" lift all around.
they worked out good for me, i could still use a little more height, but the wife has a hard time already.
In my 02 Silverado i had torsion bars and tightened them up but the front end got lose after a while like stated above. It also had 3/4 to rear springs. bought with 25,000 sold to my friend with 189,000, he has it with 215,000 now!
The 08 GMC I bought had the 3/4 to rears added also but never had it long enough to do anything to the front. bought with 20,000 and gave back on year later with 35,000 miles
The 08 Silverado has the 3/4 rear and the level kit in the front and I still drive it every day and love the truck. I have had this truck for almost 2 years bought with 27,000, now has 46,000 miles
No pic right now