3 speed transmission question?

[Claus]

I'm building a Wedico Peterbilt, it has a aluminum cased Wedico 3 speed transmission. I managed to tear third gear out of the transmission without even having a working truck, (I was running the truck off of a train transformer). Third gear is slipping on the shaft, this seems to be pretty common with the transmissions. I'm trying to decide between fixing the trans mission or going to the RC4WD transmission, I want to keep 3 speeds.

http://store.rc4wd.com/3-Speed-Full-...ack_p_830.html

Anybody have any experiences with this transmission? There would need to be some work done as the motor lays the wrong direction for a Wedico.