Gear ratio

[Leetpandaz]

Hey guys, im looking a bit into the different transmission gear ratios. Final drive ob my RTO-18 Eaton Fuller is 3.25

What would having a 3.55 or 4.10 ratio do in terms of rpm/fuel mileage? Id rather not be at 1800rpm just trying to do 65.

Thanks for any help

[Sandhill]

Posted just today, maybe just for you!

https://steamcommunity.com/app/270880/discussions/0/1696048426809490917/

[Nono54Fr]

This could help you : https://steamcommunity.com/sharedfiles/filedetails/?id=1395249415

A gear ratio of x:y means that for x turns of the first gear, the second gear does y turns.
Typically, the first gear is the driving gear and the second gear is the driven gear. Usually, one of them is set to 1, for an easier reading.

A ratio of x:1 means that the second gear goes slower than the first one but also that it delivers more torque. The higher the first, the slower the second. (And a ratio of 1:y means that the second gear goes faster than the first one but with less torque.)

For a given speed, a given wheel will rotate to a set speed, thus a set final drive speed:
3.55 > slower engine = lower RPM
4.10 > faster engine = higher RPM

The fuel mileage is linked to the load on the engine and cannot be (should not be) linked directly to a final drive ratio, 40 tons on a 3.55 will be worse than 10 tons on a 4.10, despite lower RPM.

[Hypertext Eye]

Originally posted by Leetpandaz:

Final drive ob my RTO-18 Eaton Fuller is 3.25

No it isn't. The differential is 3.25. Final drive is 0.73.

[Zippy405]

Originally posted by ハイパーテクスト・アイ:

Originally posted by Leetpandaz:

Final drive ob my RTO-18 Eaton Fuller is 3.25

No it isn't. The differential is 3.25. Final drive is 0.73.

Lol the final drive is the rear differential....they are the same thing. It is indeed 3.25 standard rear diff ratio or final drive