So i was behind my truck and i looked at it and the driver's side looked a little lower than the passenger side. so i got the tape measure out and the driver side is a whole 2-3 inches lower than the passenger side. front and back. my question is will cranking the t-bar raise that side front and back. and if so is there a special way to do it? or could it be something else. please help me out here thanks.

Mine looks like that with a full tank of fuel, the only time I really notice it is when it's in the garage. Not 12" lower but something like 1-2 "

yeah mine is about half so i don't think that is the case. and sorry guys typo its about 2-3 inches lower i wasn't thinkin right before. but i still think that quite a bit lower than the other side. and im not that big of a guy lol to make my truck lean so i don't know what it could be.

Mine was doing gthe same thing. I found out I had a blown pass and or busted internally pass side rear shock and I guess the T-bar might have been a bit more twisted on the pass side maybe. You couldn't really tell it was leaning from the front though, only from the back. That said, I think my broke or blown pass rear shock must have been the prob.

The T-bars are not adjusted the same. Mine was almost 3" lower on the driver's side. The adjuster bolt wasn't doing anything, the key was against the screw bracket. I just cranked up the driver's side to match the passemger side.

I have never seen a Chev/GMC that had the same fender heights from the factory. Nothing special to do just measure one side and bring the other up or down to be equal.

If the back is lower to then you have a problem check and make sure you don't have any broken leaf springs.

2 or 3 inches seems a bit much but I'm pretty sure there is such a thing called a factory lean. I wanna say its purpose was to compensate for highway cambers. Just something I've heard!

Ok, here goes, there is often times that ride height changes on vehicles, so therefore, you may want to adjust the t-bar to level the truck out. Keep in mind, while doing this you are changing ALL alignment angles. So make sure you take it to your local alignment shop, let them put it on the rack, adjust the Z & D height and set the alignment angles so you dont have any pull, or tire wear.

So cranking the t-bars will level out that side of the truck front and back?

No just the fount which is why I said you need to see what going on with the rear. It could just be the springs sagging, but that is kind of unlikely.

I looked no broken leaf springs. so i don't know maybe ill take it to the stealer

Just noticed another thing the higher side the passenger side tire rubs just a little when backing up just in one certin spot when i turn my wheel if i turn it farther it stops. it dosen't rub at any other time. but my question is why would the higher side be rubbing and the lower side not be rubbing i have 285/75/16 on stock wheels. the high side rubs and the low side doesent dont make sense to me?

First question to ask what have you been hauling. Sounds like you have bent the spring. With the long springs in the Trucks now they have a tendence to bend over the thick leaf on the bottom when you over load them look at the main leaf just behind the front eye where the keeper is if there is a space between the first and second leaf you probably bent the spring.

2 or 3 inches seems a bit much but I'm pretty sure there is such a thing called a factory lean. I wanna say its purpose was to compensate for highway cambers. Just something I've heard!
OMG. You need to shoot whoever told you that. Alignment is set to handle ROAD CROWN, not the whole truck.