I read in one of the offroad mags, I think it was JP, that Boyce Equipment in Ogden carries all the driveline pieces/parts for the 5 ton trucks. While I'm not sure, I'd guess those'd be 1410s. You can call 'em at 1-800-748-4269 or 1-801-393-0007 and you can email Mark Boyce at [email protected] . Let us know what you learn, eh? I'm wanting to put 1410s all up and down my driveline in my Chevy, but those dollars will have to be spent later. Good luck.