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If you do not want to crank the torsion bars or change the torsion keys then the only other way to level the truck is to put shackles in the rear to drop it down a bit.
You can crank them up to raise the front end of the truck about an inch or so, depends on the truck. The ride will change, nothing you can do about that. There are some people selling torsion keys on Ebay that are indexed differently than the stock keys. This could give you a bit more lift in the front without having to crank the heck out of the stock keys but, again, it is going to change the ride. If you wish to have the stock ride and have it level as well, then dropping the rear with shackles is the only other option. I wish I could tell you something better. If you do decide to crank it up with the stock keys, you should support the front end with jackstands, IE take the weight off of the suspension, mark where the existing setting is now, then crank them up and bit and see where it sits. I would not crank them up until it bottoms out! You will find that one side may be set differently from the factory, that is the way it is. Measure both sides before doing anything so you can bring it back to where it was if you need to. Drive it around, see if it bothers you. Some people don't like it, some don't care bacause they just want "the look", just like the guys that have hydraulics, they really don't care how their cars drive or handle, they just want it to do what it can do. If you wish to change the torsion keys, you will need a two jaw puller to do so. When you get under there, you will see what I mean. Oh, byt he way, the torsion keys on Ebay are priced very high at the moment. keep an eye out and you will see some go for about $50, right now I see them on there for about $140, which in my opinion is way too high. Shackles will run you about $40 to drop the rear. Either that or install a lift kit at a cost of about $1400 plus labor if you can not do it yourself. That will raise the truck and level it at the same time. But, then you need to buy rims and tires too!