RC-10 Hot Trick On-Road Rear End Kit <--Wazzit??

[Twmaster]

I just got one of these kits in a bunch of stuff I just bought. Says "RC-10 On - Road Rear End Kit P/N056A" on the card.

What is it exactly?

Thanks,

[src models]

ITs the rear axle assm -dont recall if it allso had two Alum blocks & slot for motor to mount .It might of used the stock gearbox wirhout the gears inside it & used a large gear to mesh with motor -works a lot like most of the on road rear axle setups -