Hi all
I am in the process of setting up a new quad axle dump in Wisconsin. I am getting the MP8 445HP with the M-DriveHD 14 speed overdrive. I will be off road a lot but not in sever conditions and a lot of on road. The salesman I am working with thinks 3.56 Ratio? I have talked to 2 other Mack dealers and they suggest going to 3.25s or 3.40 ratio? Any help would be appreciated thanks I only have 1 shot to do this right lol
3.56 Ratio= 1500 rpm at 65mph and 1650rpm at 70mph and 1950 rpm at 85 mph max
3.40 Ratio= 1429 rpm at 65 mph And 1570rpm at 70mph and 1950 rpm at 89 mph max
