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No more than 55mph in 12th gear with 3:55 is that normal?

I made the conversion 04/18/14 from a 10sp to a 13sp and thought I could do 60mph all day in 12th gear. Did I miss somthing?

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i have the same setup 11th@ 55mph 60-65 12th don't use 13th unless on flat ground

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OK after a couple phone calls I decided to call Cummins they said I have to change the parameters for the gearing which I didn't know about., never heard it mentioned. I'm going to a Cummings shop ASAP. I will have to set bullydog back to factory settings

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Nick Spitzer will be eternally grateful.
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