Do you guys have any recommendations for a custom drive shaft source. I need a super short 8 1/2 inch long 1310 drive shaft for a custom project I am working on. It is not quite a Cummins but it will be running on diesel fuel. I am building a 1979 mazda rx-7 with a turbine engine. The turbine is out of a helicopter so it has a reduction gearbox with a max output speed of 6,000. This will drive a powerglide trans. The drive shaft is to connect the engine to the trans. Any recommendations would be greatly appreciated.