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burnin oil · 10-09-2014, 12:40 PM

Back to the gear ratio thing. Stick with what Dodge offered. I would reuse the rearend of the donor truck. The highest gear Dodge hooked the Cummins to was a 3.07 gear in a Dana 61 axle and that ratio is not available anymore. This setup also did not have an OD trans. Most in the second gen body style had 3.55s . Combine that with your .75 OD and it is still a pretty good ratio setup for milage. My twinned 2500 Dodge 4x4 12v had this ratio, pushed 700hp at the wheels, and still got 18.5+ MPG on average. Some of the newer trucks got a 3.42 in the A&M axle but alot of them had 3.73 or 4.10s.

10-09-2014, 12:40 PM	#44
burnin oil Registered User Join Date: Jan 2013 Location: Eastern TN Posts: 1,919	Re: Alright chummins or stick with chevy??? Back to the gear ratio thing. Stick with what Dodge offered. I would reuse the rearend of the donor truck. The highest gear Dodge hooked the Cummins to was a 3.07 gear in a Dana 61 axle and that ratio is not available anymore. This setup also did not have an OD trans. Most in the second gen body style had 3.55s . Combine that with your .75 OD and it is still a pretty good ratio setup for milage. My twinned 2500 Dodge 4x4 12v had this ratio, pushed 700hp at the wheels, and still got 18.5+ MPG on average. Some of the newer trucks got a 3.42 in the A&M axle but alot of them had 3.73 or 4.10s.