Who makes upgraded drive (prop) shafts?

Hey guys, long time reader and follower, first time posting. I have two commanders a 2012 X and a 2014 XT, were looking to turn XTR 370's to the tune of 31"s or bigger, we'll be running Cobra axles, and TORQ lockers. I think the drive (prop) shafts will likely need upgrading as well, but i cant find any. Who makes stronger drive shafts for the Commanders? The front one specifically, since i already have the maverick diff swap and custom rear shaft. Any info is appreciated, thanks!