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Old Mar 5, 2018 | 10:09 PM
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5 speed swap

Will a 5speed transmission out of a f800 7.8 motor bolt up to 6.6 in a f700?
 
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Old Mar 5, 2018 | 11:04 PM
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Usually transmissions in that size truck will swap in later model trucks with SAE bell housings.

What years and what transmission and what engines are we talking about?
 
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Old Mar 8, 2018 | 10:40 AM
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I'm not certain of years/ vehicles, but chances are really good that if the trans case is round, it's an SAE bolt pattern. This is a standard that most equipment and anything built with a Cummins or many Allison transmissions use. I think the newer Ford diesels are now using this pattern, but I haven't measured one.

I know a guy that bolted a 4BT Cummins into a 1936 Farmall F-20. It's an amazing machine and spins our sawmill like a champ!

If you have a vehicle you're wanting to make a swap into, there was an adapter Ford made to mate their engines to a "Transmatic Drive" 6 speed auto starting in 1957. It's an early Allison transmission and uses the SAE pattern. I would say you may find this adapter for any of the engines Ford offered in these heavier trucks over the years to convert it to this pattern.
 
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