levelling kit nbs 2500 hd diesel

[albertaboy]

I installed a levelling kit on my New Body Style hd 2500Silverado Diesel . I installed the keys and shock extender brackets , I didnt put the 1.5 inch levelling blocks in the back though. Then i put on my 285/75/r16 tires with my core racing rims ( off my 2005 chevy hd that i sold )
I put as much lift as it would take so my tires dont rub , the problem is when I put it in 4x4 and go hard on the gas the truck is terrible it just pulls hard to the left or right some times
Anybody have any idea why and what i can do to fix it ?

[ob_1jr]

get some tierod sleeves and possible a beefed up centerlink. Also, if you put a locker in the front it would be good. Your front tires point at each other if you get on the throttle hard in 4wd.