Build your own .21 3-Speed creation with a .21 universal 3 speed kit. This kit includes all of the parts you need to Convert your .21 engine T-Maxx to a 3-Speed, then you can use your own stock or 1/8 scale Wheels & adapters, for your own custom setup! We've seen our customers use 1/8th and 1/10 scale truck tires and many other oddball parts to come up with some pretty wild modified 3-Speed T-Maxx trucks. This is the basic .21 Big Block conversion kit, using the Road Rage size tires. Not for use with oversized tires. You will need to supply your own .21 conversion kit. For a small block, you would need the Small block version.

Warning: there is potential for your truck to hit 55 or 60mph with this kit depending on your engine and the tires selected.