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Blog Comments posted by Lmackattack
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what RPM does it turn? at 65mph?
I ask because at 1800RPM with a T2090 9 speed (.71 overdrive) and 4.64 rears on 11R 22.5 tires (41.5" tall) you will be at 67mph.
If you run it at 2100 your top speed is now 79mph.
Does the truck have Macks "low RPM" motor? it may just need a pump RPM adjustment to get the road speed up.
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I dont know the exact specs but one of the main reasons they had such higher HP was the fact that they have a unlimited source of cold water to keep things in check. I know they used them in military Tanks as well.
E6 300 4Valve need more speed.
in drgtruckandtrailerrepair's Blog
A blog by DanielG in General
Posted
http://spicerparts.com/calculators/transmission-ratio-rpm-calculator