39 trans

Due to the laws of physics, the 39 transmission will last the longest with 25 tooth gears.
However, that can be a VERY short time if you exceed the elastic limit of the various parts.
 
Pete knows what he is talking about . . . and I happen to be one of those that recently exceeded the laws of physics! LOL
 
Around 1961 I was riding with a friend who had a stock 40 Ford sedan except for a stock 50 Olds engine. He had replaced the transmission a couple times before and had swore off mistreating it. He said words to the effect, "I need to go easy tonight, I don't want to break another trans". About that time another car pulled next to him at a traffic light. The light turn green, you know the rest. The next day I helped him replace another one.
 
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