Check around and see who the mud boggers and rock crawlers are using to build their shafts. In my hometown we have a guy who has been doing drivelines for 40 years and it is amazing at what he can do/build for the above mentioned as well as race cars, antiques to tractor trailers. A good driveline man is worth the money. He can recommend shafts for strength, and all kinds of joints. see if one exist in your area.
