no you do not have to be under 15mph to shift it into 4x4, you have to be under 15mph to lock the front diff, you can shift it into 4x4 at any speed, that is why they call it shift on the fly, and dont try to tell me diffrent because i own one, and i have done it.
and also you are much better of with the zuki then the ac, it costs alot less foe the zuki then the ac and your getting the same thing except the zuki handle better, in my opinon, the ac has no swaybars, so they make the suspension stiff so it does not roll in turns.
brad
2006 Suzuki King Quad 700Efi 4x4- warn winch, powermadd hand guards, suzuki shock covers, soon to come HMF pipe, and dobeck tfi controller
1997 trx 300ex
tag x-5 quad bend, maier xc pro handguards, polished dg alloy series nerf bars, 14t front sprocket, polished armidillo out n'back rack, armidillo swingarm skidplate, polished wb e-series works header, red hmf slip-on pipe, K&N power up kit, red gas cap vent hose, prm summit bumper, prm a arm skids, maier kill tether, utah sport cycle engine skid, titax rear rotor, ceet contra seat cover kenda front max and dirt dogs, barnet kelvar clutch pack, burgard cycle axle carrier