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Warpath · 01-05-2008, 04:29 AM

I had a Cummins M11 (11.1 liter) 350 hp with a manual Eaton 10 speed. That was the orginal setup and it had 550,000 miles on it. I screwed things up when I changed out the trannie to a new Super 10 (half of the gear changes are just a button shift) Putting that new tight trannie in dropped me to about 9.5 to 10 mpg.

I am pretty sure the rear end gear was 3.15

01-05-2008, 04:29 AM	#4
Warpath Senior Member Join Date: Aug 2002 Location: N.E. Ohio Posts: 768	I had a Cummins M11 (11.1 liter) 350 hp with a manual Eaton 10 speed. That was the orginal setup and it had 550,000 miles on it. I screwed things up when I changed out the trannie to a new Super 10 (half of the gear changes are just a button shift) Putting that new tight trannie in dropped me to about 9.5 to 10 mpg. I am pretty sure the rear end gear was 3.15 __________________ 2012 Showhauler 28'6" Motorhome on a Columbia w/ 450 Mercedes.