The reason I’m telling you about the 3.08 is because Kenworth and Peterbilt do NOT understand running in direct gear, and will usually not build the truck with a 2.21 or 2.47 rear gear. Now you can determine what fingal gear ratio you need for your average driving and speed. Engines want to be near the peak torque so it’s up to YOU to call the manufacturer of your engine and ask them at what RPM is the peak torque, and what RPM do they want the engine to cruise at. The average speed today is 70 miles per hour. However, to run in direct gear, the rear gears must be either 2.64, 2.47, 2.21 and I think there is even a higher gear than the 2.21. 1 to 1 or direct gear, is always the best gear for fuel mileage, quietness, cooler temperatures in the transmission, and more pulling power. When pulling in overdrive the power coming into the transmission is diverted in the overdrive section of the transmission and consequently power is lost, heat is generated, and the transmission produces more noise. Why? Because the power from the engine goes straight through the transmission to the differentials. What is the most efficient gear in the transmission for pulling and cruising? It’s direct gear. 73 overdrive gear and because you cannot split the gears with the large gap between 9th and 10th gear. The 10 speed it’s still considered a double overdrive because of the. I do not care for 10th gear in the 10 speed. Unfortunately this transmission has a big gap between 9th and 10th gear. If you have an Eaton 10 speed autoshift or a 10 speed manual transmission and have 3.36, 3.55, 3.73 rear gears you still have a double overdrive transmission, however, your 9th gear is direct and 10th is. This article is pertaining to most 1995 and newer 13 and 18 speed transmissions. I happen to have one in my 1989 T-600 Kenworth. 85, however, this is a very rare transmission. Back around 1990, Eaton did make a single overdrive 18 speed in which 18th gear is. With the 18 speed transmission 16th gear is direct, 17th gear is. The standard 13 and 18 speed transmissions are all double overdrive, which means in the 13 speed transmission, 11th gear is direct, 12th gear is. Today almost all transmissions are double overdrive which is a. To pick the right rear gears you must know the peak torque RPM of your engine, the ideal cruising RPM, and the speed you mostly drive on the interstates. This article will pertain to the over the road semi truck, NOT heavy haul, or vocational local trucking. Differential gear ratios there is a lot of confusion in the trucking industry about what is the best gear ratio for pulling power, fuel mileage, and a good cruising speed.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |