My c15 rebuild

[Brock]

(02-01-2017 )justdoug Wrote:  

(01-19-2017 )Brock Wrote:  The motor was rebuilt 2 years ago. Truck has mandate disabled and a tune out of spec Quebec.

Problem I see.... Truck has 336 gears on 24.5 rubber so at 65mph it's turning 1250rpm. I do that so I can run a gear down in direct and cruisearound 1450rpm. Problem is my driver always runs top gear, I know he does and I've told him not to.I only know cause he's told other drivers when they were asking how he got such good mileage.

I've now taken this truck back as my own and hired a driver who takes direction. I'm swapping my 24.5 with the 22.5 from my prostar as well to bring my direct to 1500rpm and drop my prostar from 1600 closet to 1500.

If this is a 13 or 18 speed,you do know that "one gear down" is still overdrive and not direct,right? 2 down is direct,1 down is .86 over,top is .73

18 speed. Splitter in the back position in any gear is called direct, Splitter in forward position in any gear is a overdrive gear. You are referring to the direct that the guys on the ttr forum talk about that gets you as close to the 1 to 1 ratio.

17 is direct. Eaton fuller says never switch the range selector to the low position while in a overdrive gear, that confirms what I say.