Re: Turbo 350 or 400 trans cooler lines
When considering why a manufacturer does or does not do something you have to consider the time frame. Aluminum Powerglides were built from 1963 - 1973 when efficiency was not high on the list, Along with most popular three speed automatics. All modern automatic transmissions use deeper pans or a dry sump system to improve fuel economy. If you want to take advantage of some efficiency great! If not that is great too.
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