we have a 1988 r690 with a 6 speed low hole and a 250 mack motor. not sure what the gear ratio is but its about a 65 mph truck. i was told that you are not supposed to split the gears and that the transmission wouldnt let you regardless. in this truck you can. you can go from low to direct in all of the gears and direct to low without over revving or bogging the engine. ive told people the truck can do this and they didnt believe me and said it shouldnt be able to do that but it does so does that mean i can without damaging anything?
splitting 6 speed low hole
in Engine and Transmission
Posted
we have a 1988 r690 with a 6 speed low hole and a 250 mack motor. not sure what the gear ratio is but its about a 65 mph truck. i was told that you are not supposed to split the gears and that the transmission wouldnt let you regardless. in this truck you can. you can go from low to direct in all of the gears and direct to low without over revving or bogging the engine. ive told people the truck can do this and they didnt believe me and said it shouldnt be able to do that but it does so does that mean i can without damaging anything?