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transmission upgrade

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I've got to replace the transmission in my 01 GMC Sierra 3500 4wd dually. Current transmission is 5-speed automatic Duramax Allison 1000 series but I'd like to upgrade to a 6-speed. Looking for any info, pros/cons. I'm sure it will be more involved than just buying a transmission assembly.

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Contact Suncoast Converters they have a modified valve body and TCM that'll give you 6th gear. Check out there cite, I know this because I build these there.

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