Hay Dude
Super Star Member
- Joined
- Aug 28, 2012
- Messages
- 16,481
- Tractor
- Challenger MT655E, Massey Ferguson 7495, Challenger MT535B, Krone 4x4 XC baler, Kubota F3680 & ZD331 Ram 5500 Cummins 4x4, IH 7500 4x4 dump truck, Kaufman 35’ tandem 19 ton trailer, John Deere CX-15
Yup pretty much.So my old SD would only benefit from an 8spd in fuel efficiency?
Your old 4 speed (I owned plenty E4OD and 4R100 transmissions and they were awful) only locked up in 4th gear. First couple are slush. The new transmissions have more gears and lock up in more of them. That creates more efficiency and better fuel mileage. You will get better performance in that the ratios between gears are improved. Instead of sitting in one gear through a longer RPM range, the engine moves to another gear, staying at optimal RPM.
The main reason for more gears is fuel efficiency, better performance is a side benefit.