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Modified Tech Tech forums for Modified M715 series vehicles

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Old February 28th, 2019, 03:08 PM
WillyRod WillyRod is offline
Join Date: Feb 2019
Location: Arkansas
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Default Cummins 6bt ratio gears??

Hello, new here from Arkansas!!

Looking to do a Cummins 6bt with stock ratio gears 5.38
Running 900-16 tires.
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Old February 28th, 2019, 05:36 PM
Mikel Mikel is offline
Join Date: Jan 2004
Location: New Haven, CT
Posts: 2,096
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You want to be at around 1700-1900 RPM at the speeds you'll be driving the most. Below that, you'll lug the engine. Above that, your fuel consumption will climb very quickly.

A handy gearing calculator:
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Old March 1st, 2019, 02:46 AM
glenn glenn is offline

Join Date: Mar 2007
Location: CDA, ID
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Stock ratio should be 5.87. I think you will find you will need to change axles to get better gearing to run 900x16 tires.
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