1957 mack with a 262 cummins b-75….let the rpm drop to 1300 and shift up the main box and then reving to 1700 and shifting the brownie to 1st. repeat……I had a 1957 mack 5×4 with a 180Hp maxidyne. (you never use the under-under “1st” gear. It’s way to low. s it was really a 5×3)

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