have a 36 Chevrolet 1/2 ton pickup mounted on a 1959 GMC
chassis need to use the 59 GMC diff for now. need to know what diff was used in 59 GMC 1/2 ton pickup and ratio..... no tags on diff so I can order the correct parts from USA to replace the crown wheel pinion with a better ratio.

next question using a TH350 tranny and 27.1" tires what should the correct diff ratio be... Chevrolet 327 motor

busy trying to locate a ford 9" diff here in south Africa.