Manual Gearbox 16 x 1 Ratio?

If you take a standard man box it can be converted to 16:1 by swapping the worm gear.

Call around in your area to shops that rebuild boxes, somebody will be able to do the swap, and will know what would have the worm gear you need, instead of buying a MP one... It was way cheap, like only $50 more than a regular rebulid...

JOE