The Big Block PowerPack bracket is the best way to mount your GX 390 based engines like the 420cc and 459cc Predator with the popular 40 Series reverse gearbox and 40 series CVT transmission.  The Big Block PowerPack rigidly mounts this gearbox to the bracket, and eliminates the problems of using the CVT backing plate or remote gearbox mounting.  By mounting the engine and gearbox together, precise clutch spacing can be maintained and the stock 203785 belt can still be used. The Big Block PowerPack provides all the adjustability you will need to properly align your clutches and drive belt. With it's built in 4 point slotted mounting system, the Big Block can be adjusted for optimum drive chain tension.   The Big Block PowerPack inlcudes all the hardware you will need to mount your gearbox and engine to the bracket, and is designed for easy assembly, providing  access to all engine and gearbox bolts. An optional battery mounting bracket is also available if you are running an electric start engine and want to mount the battery on the PowerPack bracket, directly under the starter using your YTX14-BS battery.  See Amazon links below for common parts.  Gearboxes are available from ecocycle.ca