My dad recently had the 2 piece drive shaft of his ’68 ford rebuilt by Drive Train Industries in Denver, Co. They did an excellent job with one day turnaround on the truck. We noticed a wicked shimmy above 40mph in the rear end, and seemed to be consuming u-joints at an irregular rate. They diagnosed and repaired it for only $210. They installed a new carrier bearing, balanced the driveshafts using a high speed spin balancer and installed brand new u-joints, all in one day, and for a ridiculously good price. Anyone who needs service on their work or high performance rear drive vehicles should check these guys out, because they are great. They even do custom drive shafts and LSDs for race cars, so if you need a rear end for your tubbed Nova, call them up.