1956 t bird transnission oil

[KULTULZ]

The ban of use of whale oil ended Type A and B. Type F was Fords new oil and Dexron IID was GMs after the change.

I was wondering how long it would take ...

Automatic transmissions ran smoothly and reliably using whale oil in lubricating fluids, as long as engine coolant temperatures ran below 173 degrees F. Fortunately for the whales, by the 1970s engines became subject to tighter emissions regulations and engineers had to design them to run hotter. Other demands such as front-wheel-drive and ever-increased emissions limits boosted the operating temperatures of engines to well over 200 degrees F, forcing research efforts into synthetic lubricants and rendering the use of whale oil (really an esther, not an oil) obsolete.

SOURCE - http://www.secondchancegarage.com/public/725.cfm