[EricH]

Originally Posted by Spirator

Does anybody know what the ratio for the FisherPrice gearbox is, alternatively, does anyone have a good idea of how to measure it?

I'm not sure what it is, but I do know the (hard) way to measure.

Take it apart. Be careful; you'll have 3-4 screws and 3 or so mounting tabs to undo. Screws first, then use a small screwdriver to help with the tabs.

CAUTION: The FP gearbox is full of thick grease. I was on a team that raided some to lube up their Toughboxes once and still didn't have a problem with keeping the FP gearbox lubed!

Next: count the teeth for each gear. This will give you 3 ratios, IIRC. Get each as an X:1, then multiply the Xs to get a final Y:1 ratio. If you like whole numbers, go ahead and get it into that.

Then put the gearbox back together and make sure it still turns right.