160w oil is what is recomended in 4speed truck trannys from Chevrolet. The problem is finding it in Canada. Mbile oil carries it but you may have to buy in 5gal pals. It's also known as 600w steam or cylinder oil. Never use a detergent oil in an old tranny. Especially if a 4 speed non-synchro. This information is from the original Chevrolet service manual.


Keith and Kim
1942 Chev 3/4-Ton Flatdeck in the Gallery
Victoria, BC, Canada