The swingarm on any modern scooter is the transmission. The way you stretch a scooter is by extending the motor mount itself. Some are bolt ons, the cheapest way to do it to the length you want is the Mojo weld on mount. Its like $80 shipped.
To lower it, you swap in a shorter, heavier duty shock for the rear. Most people weld on a shock mount to the rear of the frame, but there's also companies that make bolt on shock mount extensions that bolt into the stock mount location.
To lower the front, for real Rucks (doesn't fit my clone, different sizes) there's aftermarket lowering forks/fork springs. On mine, I took the springs out of the stock forks and cut about an inch worth of coils out.
