gear ratios in direct drive vs overdrive

Because you need a lower low gear to get it rolling without twisting the driveline up etc. to get the lower 1st gear you gotta loose overdrive.....or bite the bullet and put an 18 speed in it.



Your not going to gain what you think you will

 

Do not put a 2.67 in. You'll be throwing thrust washers, slipping clutches, etc.

To see what you're in store for, when you're loaded start out in 4th gear every time.

 

The high gear ratio and driving in direct only work if you have a 13 or 18 speed.

 

Find a dyno chart for that engine that can give you fuel consumption per hp and tune the drive train to put the r’s right below that sweet spot of lowest fuel consumption.

 

JMO but in the long run your gona be better off doing as @wore out said and just put a 18 speed in
Your gonna have bad things happen if you drop down to 2.67 and try to get rolling loaded especially if your out in a field with a loaded welfare wagon

 

Calculate how long your recovery time is gonna be on the cost to change the rears …….vs hypothetical fuel savings

 

Everything you wanna haul is going to be heavy and unfriendly in the wind. Most of it is going to come out of crappy terrain that will destroy a driveline if rears aren't low enough. You will get worse mileage with that fast gear.

 

Money ahead to switch to 18/13, then re-evaluate, and 2.67 seems too low imo

 

13 won't gain anything in this situation. 18 would, but 13 won't

 

I can say this too. That history has shown and proved in the ag hauling business that the lowest horsepower lowest geared slowest trucks are the most efficient and dependable in that field. With some exception to cattle hustling. That is why the bullwagons always ran 4.11’s but had 13,18,or twin stick 20 speed transmissions. Get rollin nice slow and easy and have the speed on the top too.