Hello. I am new to this forum and I am hoping to find some assistance.

My vehicle:
2005 Dodge, 3500 4 door, 5.9 with a factory six speed manual transmisson.

I waited many years to be able to afford a Dodge Cummins Diesel and I have been extremely happy with my truck but I have one problem.

I drive 2 to 2 1/2 hours a day to get to and from work so the bulk of my driving is open freeway. My fuel mileage is great but I believe I can get more if I could remedy my transmission problem.

I run my truck at 2000 rpm which puts me at 66 to 68 mph and I have found that this speed and rpm range currently puts me at optimum fuel mileage which is 24.7 (and occasionally 25) miles per gallon which I believe is excellent for a full size pickup.

When on the freeway my truck just seems to feel like it needs one more gear.

My thinking is that, if I had One more gear that obviously I could run my truck at 75 to 78 mph and get the same and possibly a little better fuel mileage but this is my problem.

I am sure that no one makes a 7 speed manual trans. for this application but I was wondering if anyone knows of any type of "over drive" kit that is applicable for the 6 speed manual trans. for the Dodge Cummins? But I am probably swatting at the air on this one, anyway, Any help or assistance would be greatly appreciated.

Thank you and Keep On Truck'in  
hizson  

well there gearvendors overdrive units and there another company that makes them too but i forget the name of them  

U.S. Gear makes one too.  

or put a more highway gear in  

I don't know of anyone that makes a 7-speed manual, but I know there are some gear-splitter or overdrive kits out there. Their website is a little hokey, but <u>&lt;strong&gt;High Impact Gear&lt;/strong&gt;</u> might have what you're looking for.

You might also want to go with a slightly taller rear axle ratio. If you're at 4.10 right now, you could probably go to a 3.73 and still retain most of your towing and hauling capability.