The V2 slipper is designed to work with the G2, G2r, G3 and G3r chassis, it wont work in a stock type chassis without hacking it to pieces. As for the singlespeed, yep, just buy the coupler and fit it into the 2nd gear output gear, then you can remove the shifter, dog, 1st gear output gear & 1st gear idler- you just keep the stock tranny case & dont have to modify the input gear shaft.
or you can just take the original drive dog and screw it together with the gear works very well and it will cost you 2 screws, 2 washers and 2 locking nuts :)
Radek
V4 D8 - RX8, XERUN 4168SD
F1-09 - Tekin RS Pro, 17.5t Redline, 2S LiPo
Sakura Zero S - LRP, Saturn 20T, 2S LiPo
*EX-10 Eurus*
True, true. Though i have heard a couple people say that the drivedog rounded out on the output shaft, where as the coupler is aluminum so that wont happen. Depends how strong the motor being used is, but your method is alot cheaper wallot I must admit.