In older makes and models, start by checking the vacuum lines and other parts which connect to the transmission. It’s entirely possible that the transmission itself is in working order and was simply put into the vehicle incorrectly. However, the three (3) most common issues are actually failsafe: In the event of a part failure in an Allison transmission, the best option is usually to take advantage of the warranty. Common Issues with Allison TransmissionsĬustom-designed for several different industries and proven to deliver reliable power and work, Allison transmissions have moved America for over a century, but, at the end of the day, they’re still machines and machines inevitably break down and experience problems. Allison’s spline is patented because of its unique design that allows for a greatly increased amount of torque– and with it, faster acceleration and improved performance. This benefits not only the engine but also the universal joints and the rear axle, prolonging their operating life. This creates a cushion effect which reduces shock and strain across the entire driveline. The torque converter acts as a fluid drive between the engine and transmission. This allows the Allison to act as a continuously-variable transmission, giving trucks the power to move faster out of a steep grade or a loading ramp. The torque converter multiplies engine output torque to create a range of low-end ratio coverage. Instead of using as many gears as an equivalent manual or AMT, Allison transmissions feature a torque converter. This gives them a unique ability to make the most of the engine’s horsepower and torque, delivering more of it to the truck’s wheels. Today, Allison Transmission is “the largest designer, developer, manufacturer, and distributor of medium- and heavy-duty fully automatic transmissions and hybrid propulsion systems in the world.” Allison Automatics – unlike manual and automated manual transmissions (AMTs) – boasts no power interrupts during shift change. Allison engineers designed, developed, and manufactured the world’s first automatic transmission for heavy-duty vehicles: city buses… locomotives… and delivery trucks. Their new transmission combined range change, steering, and braking – a revolution in its time.Īfter WWII, GM turned Allison Transmission loose on civilian transportation. At the end of that war, GM put Allison engineers to work in a new field: power transmissions for tracked military vehicles. The company’s experience and expertise in aviation engineering was one of the primary reasons General Motors wanted to buy the company following James Allison’s death in 1928.Īllison remained a major force in aviation engineering through World War II. Allison became the main power plant in the US war effort. When World War I started, Allison suspended racing and the Allison Experimental Company turned its attention to machining parts, tools, and masters for the Liberty airplane engine. He and his company quickly gained a reputation for their race cars and automotive technology innovations. James Allison provided financial backing for several race teams and, in 1915, started his own. Two years later, in 1911, Allison’s track held the first Indianapolis 500-mile race. Allison and three business partners funded and constructed the Indianapolis Motor Speedway. How do they work? How have they lasted so long and built such a reputation? What sorts of problems can they have? And what’s the best way to get the most miles out of them? History of Allison TransmissionsĪllison started in 1909. For over a century, they’ve been integral to the Indianapolis 500, the war effort, and freight. Allison transmissions are practically legendary.
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