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Message: [QUOTE="Powerstroke Cowboy, post: 1557713, member: 610"] Towing would be so much nicer with a 6 speed auto instead of a 4 speed auto. It comes down to the amount of gears available. Plus I can run 4.30 gears with the Allison and have the same rpms at 70 as 3.73 in the 4r100. Better for towing. Plus the Allison has a lower first gear, better for getting big loads moving. It's got a zf6 now. So I can also start with a clean slate. If I was building a play toy, it would get a 4r100. But I am not. So, Allison it is. If there was a way to control the 6r140, I would go that rought. With the Allison I can use all factory IH parts to bolt it to a 7.3. [/QUOTE]

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