allison 5 spped to 6 speed - Chevy and GMC Duramax Diesel Forum
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Old 10-23-2009, 07:03 PM   eBay Motors  #1 (permalink)
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allison 5 spped to 6 speed

I have a question regarding 5 speed to 6speed change over can the 5 speed trans be converted to 6 speed ?
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Old 10-23-2009, 07:06 PM   eBay Motors  #2 (permalink)
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yep thats what that kit does...

however its not really worth the money...if you really want lower revs regear it
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Old 10-23-2009, 07:06 PM   eBay Motors  #3 (permalink)
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Yes they can be converted but its not worth it in my eyes. You have a 6 speeds in your truck already.
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Old 02-10-2011, 08:53 PM   eBay Motors  #4 (permalink)
 
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i have the 5 speed but i want better mpgs and my dads 6 speed gets way better without any changes from stock. What can I do to change it to 6 speed and with gearing so it tows good but yet gets better mileage because i dont hardly tow anything but when i do i still want the power. Any suggestions
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Old 02-10-2011, 08:55 PM   eBay Motors  #5 (permalink)
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If you have the cash laying around buy the conversion kit... But its not worth it.
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Old 02-10-2011, 09:10 PM   eBay Motors  #6 (permalink)
 
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what would be better to increase my mpg and the issue im having with what seems like slop between shifts when my programmer is on?
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Old 02-10-2011, 09:18 PM   eBay Motors  #7 (permalink)
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The slop is prolly from defueling which I would leave on unless you want to trash your tranny.

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Old 02-10-2011, 09:31 PM   eBay Motors  #8 (permalink)
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what is this conversion kit u all are talking about.? a 6 seed has a lower gear than my 5 speed alli does right.? cus i think a lower gear would help me towin big loads..
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Old 02-10-2011, 09:36 PM   eBay Motors  #9 (permalink)
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01-05 GM 6.6L Duramax PPE 5-6 speed conversion kit.



Only one I could find on a site sponsor.
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Old 02-11-2011, 07:45 AM   eBay Motors  #10 (permalink)
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I laugh at everyone that says the 5-6 conversion is not worth it. Almost everything that is done to these vehicles are not worth it-- tuners, exhaust, tires, wheels, lifts, bumpers and etc. To them, nothing is worth it, except what they want. There is no payback on anything.

The conversion is expensive and probably overpriced, but Suncoast has figured out how to make it work, and it does work. They are getting paid for the R&D. The kit is a modified valve body and a reprogrammed TCM, all exchanged back to Suncoast. This is the only way to get 6 speeds out of an early 5 speed Allison-

It may make a difference in fuel economy, but the biggest plus is the lower cabin noise at freeway speeds. When you go to T/H mode, it blocks out 6 gear. I doubt you will be able to tow in 6 gear anyway, unless you have a small light traailer.
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