have a cummins 6b 6 speed.loses power in mostly 5th and 6th gear.huge power loss going up hills end up down shifting to 3rd just to make a small hill.any im thinking fuel filter but need some help from the pros
Cummins 6b 6 speed loss of power up small hills
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by pendex6, Mar 19, 2021.