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Mack performance



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I suspect it will pull like a freight train out of the hole and accelerating. Startability on steep hills loaded heavy will be of little concern with those slow rears and the two low gears in an 8LL. Your top speed will be slow though with rears like that. on 11R24.5 rubber it will probably be around 57-60 mph top speed. My RD with 6.06 rears and T2070 (0.6 OD ratio) tops out at 62 mph on 11R24.5s. An Eaton 8LL has a 0.71 overdrive so it will be slower plus your rears are slower. Without doing the math I would say somewhere from 55-60 mph at 1800 engine rpms. If you have small tires wit will be even slower...

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