My new truck will be

so whats the oint of this thread? Bragging? Next time make it straight

 

Yeah, it is usually a combination of the right things put together that can make a major difference. Just one thing like 6x2 may not pull off the wild fuel saving claims brought up. While I don't use a 6x2 configuration, I operate primarily in direct drive on the tranny at cruise speed, have the gap between tractor and trailer as tight as I can get it without going over on steer axle, am running wide based rubber, synthetics in all the boxes, etc, etc, etc. With that, I am getting high 6's to 7 mpg in the winter with all the wind and cold, and high 7's to 8 mpg in the summer months. And that is with 6x4 configuration with full lockers in both drive axles. Now the 6x2 might give me some extra, but I would be hard pressed to go places that I have to during the winter months. And since the truck stays up north all winter long, going to 6x2 is not a viable option for my operation.

 

A 7 speed was the transmission we used, because you are not turning a back box. And had 50 weight motor oil in them to reduce drag as well. 16 inch air gap between cab extensions and nose of trailer. Just a few of the tricks besides the drive set up. This will not work in a bunch of jobs. Best of luck!

 

They green lighted it for warranty . Tried to get them to green light 50 weight for the rears, but said that the shear strength was not high enough. ( think that was how it was worded) . But no warranty if we had did it in the rears, so we had to use gear lube in the rears.

 

Not sure why you would use a 50w motor oil in a tranny when most are spec'd to use a 50w gear lube. Ideally, a 50w synthetic. Or did I miss something in your post?

 

Back then the standard was 90/140 weight , was 1986. Big difference between the two.