my K-3000 run's 62.5mph@3,000rpm the 379M-V6 seem's happy at 3,000 rpm.
the B61T run's 72mph@2,000rpm I changed the mack triplex for my own version of the triplex. I combined a later model mack 5spd OD tran's with 3spd auxy now i got 2 OD's then i added a turbo to the 711END to create a 711END-T,stock 58mph@2250rpm now 72mph@2,000rpm. . .I gained 14mph and 2mpg. . .
mike. . .
