The Stovebolt Site Forums The Parking Lot Big Bolts 1951 Chevrolet 6400 rear axle seals and bearings

Hy bigblack'74, that is indeed a Timken double reduction two speed rear axle. The following list of parts are Timken unless otherwise noted, prices are USD at RockAuto unless otherwise noted
pinion seal National p/n 475234N $6.74
rear wheel seals National 6358 $9.76
pinion bearings p/n 3875, one required, no parts found
p/n 3820 one required $7.60
p/n 45920 one required, no parts found
p/n 49585 one required, no parts found
Intermediate shaft
p/n 59162 one required, no parts found
p/n 59200 one required, no parts found
p/n 59412 one required, $25.99
Bull gear shaft bearings
p/n 3994 two required $21.79
p/n 3920 two required $7.61 Wheel bearings, inner p/n KD12051Z $41.79
outer p/n KB 11786Y no parts found
Hope that helps some.