gio400 Posted November 16, 2013 Share Posted November 16, 2013 what is the gear ratio of the mack t2080 transmission. i am purchasing a truck with the t2080 with 4.33 ratio. where i from have steep hills so i want to change the ratio. any ratio recommendation. im thinking on 6:34 ratio. how fast wiill it goes and how good will it be in steep hills. engine is e7 350hp. Quote Link to comment Share on other sites More sharing options...
j hancock Posted November 16, 2013 Share Posted November 16, 2013 Here is a chart.Miami has hills?6.34 with .60 over would give you a 3.80 final ratio. It would probably keep up with traffic.What tire size are you running? Quote JimIt doesn't cost anything to pay attention. Link to comment Share on other sites More sharing options...
slpwlker Posted November 16, 2013 Share Posted November 16, 2013 Yeah we do. Got some pretty big bridges and little over passes. Other then that if it don't pull over those I'd say shoot it and put it out of it's misery till a suitable engine is found. Quote Link to comment Share on other sites More sharing options...
gio400 Posted November 17, 2013 Author Share Posted November 17, 2013 lol im sending the truck to the virgin islands in the caribbean it have steep hills there, speed aint much a factor is pulling and turning off in the steep hills what are similar to cliffs, Quote Link to comment Share on other sites More sharing options...
gio400 Posted November 17, 2013 Author Share Posted November 17, 2013 i have to check i think there either 22.5 or 24 have to check Quote Link to comment Share on other sites More sharing options...
gio400 Posted November 17, 2013 Author Share Posted November 17, 2013 what estimate the top speed to be with either of those tire sizes with 6:34 Quote Link to comment Share on other sites More sharing options...
j hancock Posted November 17, 2013 Share Posted November 17, 2013 With 1100R 24.5 tires, it would be 52 mph at 1500 rpm and about 62 mph at 1800 rpm using the 6.34 rears. Quote JimIt doesn't cost anything to pay attention. Link to comment Share on other sites More sharing options...
Lmackattack Posted November 17, 2013 Share Posted November 17, 2013 http://www.analysis-inc.com/reference/road-speed-calculator/4.33 rear ratio, .60 final drive, 11R22.5 tires (498rpm) If you have a 2100 rpm engine 97 mphIf you have a 1800 rpm engine 83 mphPersonally with a low rpm engine I would keep the truck with 4.33 so you have more road speed. Quote Link to comment Share on other sites More sharing options...
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