Yes, everything ahead of the bearing retainer is the same. I got involved in the conversion recently, but the other way- - - -changing an open driveline 420 to torque tube drive. Do not discard the front universal joint yoke used with the torque tube- - - -it's unique to the 420 transmission, and it's very scarce! The joint cross and the rear yoke are the same as a 1/2 ton, but not the front!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!