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Please help me. Where would i find the gear ratios for a Mack 5 speed 1078 and a Mack 12 speed T1070. Thanks in advance

the 5 speed,2 stick 6 speed,TRDL1070 10 speed, TRTXL1070 12 speed all have the same ratios in direct,but in overdrive the 10 and 12 speed are the same. 1st 6.68 2nd 3.89 3rd 2.21 4th 1.29 5th 0.78. you could put a 10 or 12 speed behind a maxidyne and shift it like a 5 speed then if you shift on a hill you could split a gear, i am going to put a 10 speed in my 58 B model behind a 237. Ron

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