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- Sworkz S12-1M ‘4’ Gear to ‘3’ Gear Upright Gearbox Mod -
‘Note, you will need new Gearbox casings and spur gear cover if you want to convert back to ‘4’ Gear Gearbox after this mod’.
1: With the gear box halves together, cut down the ‘Three’ motor plate posts around the layshaft hole, until you get to 18mm total.
2: Open up the blank side of the gear box half, just until you can fit the layshaft through the hole.
3: You need to block the now ‘Open’ holes as so Dirt doesn’t entre the gear box. I used a piece of foam and a screw as per the photos.
 
4: Fit the Idler gear Insert for ‘3’ gear alignment.
5: With the halves together, use some 2mm one sided adhesive foam to cut out and make a dirt protector.
6: Fit a layshaft bearing into the motor plate support housing, and fit as per the photo.
7: Drill out 3 x M3 nuts with a 3mm Drill Bit. Then use the 3 x Alloy spacers that come with the 4 Gear gearbox, fit the ‘Drilled out’ M3 nuts above the Alloy spacers as per the photo, and attach the motor plate.
8: Assemble the slipper clutch as normal. Cut away sections of the Spur gear cover until it sits flat and clears the diff outdrive.
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