I just had the transmission on my 1960 chevy pickup rebuilt. My shop manual says to put 5-1/2 pints of SAE 90 oil in it. However, the outfit that rebuilt the transmission said to try 50 weight engine oil mixed w/ lucas additive for easier shifting. I'm finding out how little I know about lubrication especially when I visit websites like www.bobistheoilguy.com. Instead of filling my head with a bunch of information I would rather just have an experienced recommendation from the folks here.