That would work, the "cone" thing is just the type of the limited slip differential. You can tell Cass whatever you'd like, he can build it with a clutch type, a cone type or even his own helical gear set up differential.
Awesome looks like I have to make a call as his name has come up for literally every I want to do. Disc brakes, axles, spring offset, and now this. Going to read up and keep an eye out, I'm sure for the money I could go a different way. But you get what you pay for.
