I needed to redo the shock mounts on the metal tech a arms I got. I wanted full droop travel out of the a arms I got, the a arms extend another 1.25" downward when the shock is unbolted. So I cut off the shock mounting tabs and welding in new ones that allow full suspension downward travel. Cycling the a arms allowed 12" of travel, letting the ball joint bind downward and upwards. The trx450 front shock collapsed length I'm not sure about so I'm not sure if I'm getting the 12" travel I measured.
The unexpected benefit was the major reduction in bump steer w/ the z400 spindles. Now I run 1/8" toe in fully extended and at full suspension compression it toes in. The Zilla spindles have to be toed in at full droop and toes out as the suspension compresses, and toes back in at full compression.
The spindles allow a tighter turning radius which was another benefit. The Ackerman (where the inside wheel turns a tighter turning radius at full lock than the outside wheel) is more noticeable.
http://www.suzukiquadracerhq.com/chassis-suspension/bump-steer-mod/