i have a 96 tahoe 2dr. it has no lift and 285\75\16 open country a\t's on factory wheels... I want to run 33x12.50x16's on 16x10's... How much do I have to lift it to get them to fit without scrubbing? can I just install new torsion keys and crank them up? The tires I have now Measure 32.8 x 11 i think