I noticed my 06' doesn't sit level. What is the differance in height from the front to the back ?

It's only a few inches, but it seems to be common in the newer trucks.  They are made to sit level when the rated load is in the bed.  My Dodge Ram is the same way, it's high with an empty bed, but it sits perfect with about 1500 lbs. in the back.

It's 2.5" they make leveling kits out there that will make the truck sit level, but you're going to have to sacrifice ride
quality. That is unless you opt for new front suspension altogether.

Its a pick up truck they never are level they are higher in the back to handle loads usually higher by a few inches its normal  but if it bugs you and you don't plan on hauling anything heavy you can install a leveling kit


paul