gio400 Posted November 2, 2022 Share Posted November 2, 2022 How will Mack a Mack e7 400 performance be with a 8ll transmission and 6.14 Rockwell rear end Quote Link to comment https://www.bigmacktrucks.com/topic/70647-mack-performance/ Share on other sites More sharing options...
0 67RModel Posted November 2, 2022 Share Posted November 2, 2022 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... Quote Link to comment https://www.bigmacktrucks.com/topic/70647-mack-performance/#findComment-514243 Share on other sites More sharing options...
0 67RModel Posted November 2, 2022 Share Posted November 2, 2022 Plus with 400 hp it probably wont slow down much on gradual hills once up to speed. Meaning once you are cruising at top speed you will probably only ever have to downshift to 7th (direct) to maintain your speed. Quote Link to comment https://www.bigmacktrucks.com/topic/70647-mack-performance/#findComment-514244 Share on other sites More sharing options...
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gio400
How will Mack a Mack e7 400 performance be with a 8ll transmission and 6.14 Rockwell rear end
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