dm690 Posted February 11, 2010 Share Posted February 11, 2010 hi im buying a mack dm 20 yard with e7 300hp engine,T2070 transmission and 5.73. where the truck is goin to work in steep hills. with the gear ratio and tranmission will be be good enough to turn off from in stand still position loaded in a steep hill and have good reduction comming down hills or is it best to beef up the gears in the back? and if to beef them up what ratios will be best? Quote Link to comment https://www.bigmacktrucks.com/topic/12620-gear-ratio/ Share on other sites More sharing options...
daveigou Posted February 11, 2010 Share Posted February 11, 2010 A T2070 trans has a 14.16 to 1 Lo-Lo. With 5.73 rears you might not be able to climb a tree loaded, but it should be OK for just about anything else.Dave Quote See my Flickr photostream page http://www.flickr.com/photos/96692978@N05/ Link to comment https://www.bigmacktrucks.com/topic/12620-gear-ratio/#findComment-49472 Share on other sites More sharing options...
HK Trucking Posted February 11, 2010 Share Posted February 11, 2010 hi im buying a mack dm 20 yard with e7 300hp engine,T2070 transmission and 5.73. where the truck is goin to work in steep hills. with the gear ratio and tranmission will be be good enough to turn off from in stand still position loaded in a steep hill and have good reduction comming down hillsYes, if the truck is on 11R22.5 rubber. I had a couple DM690S dump trucks with that combination and they had plenty of reduction.. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/12620-gear-ratio/#findComment-49475 Share on other sites More sharing options...
David Posted February 12, 2010 Share Posted February 12, 2010 Should take off easy but on the other end it will need 2000 rpm for 60 mph (with 1100R22.5). Quote Link to comment https://www.bigmacktrucks.com/topic/12620-gear-ratio/#findComment-49494 Share on other sites More sharing options...
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