I can't imagine you would need a higher angle driveshaft with a 6" lift
. A CV driveshaft doesn't have anymore working angle than a single u joint in most setups, its used when the proper driveshaft ujoint angles cannot be achieved, not to gain working angle.
I couldn't get your link to work do I cant help with the yoke, but if the driveshaft does not have a expansion yoke built into it, then the attachment to the transfer case is.a slip yoke. If it does, then the yoke on the transfer case is fixed, bolted on, and is a fixed yoke. The yokes on the driveshaft itself that are welded to it are weld yokes and a usually.pretty common and inexpensive but need to be matched to the driveshaft tube OD and ID
1977 j20. Dana 60's, 4:10's chrylser 360/np435/np203
Unmodified hummer 24 bolt wheels and 37" mt/r's.