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Old 09-05-2013, 02:55 PM
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Random thought...six speed auto in '08

Has anyone put a six speed auto in place of the five speed behind the 6.4? I get about 20-22 mpg on the highway now, thinking I might be able to improve that with a six speed. Maybe one out of a 6.7. I think it's time to upgrade my tranny anyway, so whatever goes in will be upgraded as well. Just an idea.


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Old 09-05-2013, 03:34 PM
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I asked about this a while back, probably a year ago, I was thinking about putting it in my '10. A couple guys chimed in and said that it would be close to impossible to put the 6speed with the scorpion in with the 6.4. I guess the electronics are completely different. I figure it would be easier to toss an Allison in.
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Old 09-06-2013, 06:36 AM
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Originally Posted by BigGreen06 View Post
I asked about this a while back, probably a year ago, I was thinking about putting it in my '10. A couple guys chimed in and said that it would be close to impossible to put the 6speed with the scorpion in with the 6.4. I guess the electronics are completely different. I figure it would be easier to toss an Allison in.
it would certainly be a huge waste of time
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Old 09-07-2013, 06:26 PM
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Quote:
Originally Posted by dieseltruckin View Post
Has anyone put a six speed auto in place of the five speed behind the 6.4? I get about 20-22 mpg on the highway now, thinking I might be able to improve that with a six speed. Maybe one out of a 6.7. I think it's time to upgrade my tranny anyway, so whatever goes in will be upgraded as well. Just an idea.


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Your getting 20-22 hand calculated?!?!?!

Dont change ANYTHING!!!! That's amazing mileage.

And IIRC the top gear of the 6 speed has the same ratio or our 5 speeds top gear. So in theory, your mileage in high gear wouldn't change. I'm sure someone will correct me if I'm wrong about the top gear ratio.
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Old 09-07-2013, 07:22 PM
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Aight. Thanks y'all. Yea, 20-22. I drive pretty conservative though. Usually run the speed limit and don't hammer down when I take off. It also helped when I set the tranny to only lock up in 5th at a lower rpm. Not as fast or responsive as it was, but I get better mileage and it shifts nice and smooth.


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