For future reference this gear box is a 2210 or 2010. Here is a link to boxes manufactured prior to 1977 http://www.easymotoculture.com/vues_eclatees/Spicer%20Dana%20Foot/Bo%EEte%20de%20vitesse/TRA-DAF-0000_2210-till%20Nov%201977.pdf
Post 1977 parts lists are available to download too.
Stripped my one down and found a few issues.
The pinion gear being at the bottom of the box suffered the brunt of the corrosion. Word of warning to anyone dissembling these. Be prepared to catch a lot of needle roller bearings when you remove the pinion shaft!
Secondly the Bevel gear is missing 1/2 tooth and finally the drive shaft has 2 cracks in 2 of the keyways.
I think this box might be too far gone guys.
(dont know why pics are being rotated when using the forums uploader)