when i install my 14 bolt that is almost finished, all i lack is gear set up and perches, i plan to do a shackle flip from off road design. i have heard it moves your axle forward. how much? because my tuffstuff perches only allow me to move back one inch and the 35s are really close to hitting the front of the rear fenders when it flexes. what is a good method for centering my axle?