[jason701802]

There are many other sources for gearboxes as well. We used several drill transmissions last year on our 'bot. For the 775, we spent less than $40 for an old high quality cordless drill from a used tool shop, they're cheap when they don't come with batteries. It was even a 2-speed and had anti-backdrive. I would honestly trust it more than an AM Planetary, not to diss AM, but drill transmission are orders of magnitude higher in terms of products sold and years in service (the latter may just be a single order of magnitude).