Driveshaft is stock with 7260 U Joints that have the grease fitting on the end cap. Axles are Moser, spool, 3.91 gears....... I have talked to several guys about this subject and it seems there is some myth about using the bigger U Joints etc.
There is also a guy on here that is using an Aluminum driveshaft off a Crown Vic. They come stock with 1350 U Joints and they only cost about $70.00 however you would need a new pinion yoke & Trans Yoke or use conversion U Joints to make it work. Either way would be way less expensive to set up than normal buying new stuff. Just another option.
