raybing Posted August 19, 2012 Share Posted August 19, 2012 Hey guys, I need advice on getting more speeds for my mack em7 300 hp with 8 speed. It has 5.03 rears. My understanding is that the 2080 trans has 40% OD. I have a 85" tree spade and the 3 low grears work great off road. On road it is basically a 5 speed. I am adding a pod trailer this week and would like more gears or more POWER, haha. Could a quad box help? Thanks Ray Quote Link to comment https://www.bigmacktrucks.com/topic/26873-aux-transmission-for-98-r600-em7-with-2080-trans/ Share on other sites More sharing options...
bts-4120 Posted August 23, 2012 Share Posted August 23, 2012 it has a .60 OD which is alot faster than a fuller for even a mack 9 or 13 with 5.02 at 2100 truck should run close to 70 not sure how much speed you wanting out of a DM Mack I have heard of guys putting a OD brownie box behind the old direct drive 2 sticks that could be a option Quote Link to comment https://www.bigmacktrucks.com/topic/26873-aux-transmission-for-98-r600-em7-with-2080-trans/#findComment-134700 Share on other sites More sharing options...
Lmackattack Posted August 23, 2012 Share Posted August 23, 2012 it might be a 300"L" (low rpm motor) cuts about 300 RPM off the normal 2100 max rpm... Quote Link to comment https://www.bigmacktrucks.com/topic/26873-aux-transmission-for-98-r600-em7-with-2080-trans/#findComment-134708 Share on other sites More sharing options...
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