Allison Transmission is the world’s largest manufacturer of fully automatic commercial-duty transmissions, and is a leader in hybrid-propulsion systems. Allison 1000 transmission specs, ratios, and information. The Allison 1000 5 speed (2001-2005 model years) and 6 speed (2006+ model years) transmissions have been offered mated to the 6.6L Duramax in GMC and Chevrolet pickups since 2001. Its heavy duty design and proven reliability have made it stand out in the 3/4 and 1 ton marketplace. For 100+ years, Allison Transmissions have built a reputation on performance and durability—equipping the transport industry with the ability to get the job done more efficiently. Williams, we are a proud Allison Transmission distributor and service provider—and we're known for understanding the products inside and out.
INDIANAPOLIS--(BUSINESS WIRE)--The U.S. Army selected Allison Transmission, the largest global manufacturer of medium- and heavy-duty fully automatic transmissions for commercial and military vehicles, to undertake an engineering program that builds upon previous analysis and evaluates the X1100-3B1 transmission and final drive changes necessary to expand the Abrams’ performance edge in speed, cruising range and durability.
Different Types Of Allison Transmissions
The Abrams tank, introduced in the early 1980s, has been the subject of continuous capability improvements throughout its service life. This effort represents a deliberate plan by U.S. Army program managers and engineers to maintain the superior performance necessary to succeed in combat.
“Our support for the Army’s armored formations spans over five decades,” said Dana Pittard, Vice President for Defense Programs at Allison Transmission. “This contract demonstrates that Allison’s long-term strategic relationship with the Army is built on trust, partnership and a mutual commitment to the Abrams fleet. Enhancements and upgrades to this battle-tested design will support the Army’s needs for decades to come.”
Allison’s commitment to product improvements, coupled with technical expertise and a skilled workforce, provides the military with powertrain solutions that assure mission success. Allison engineers work side-by-side with the Army’s Program Office to provide the technological edge, sustained performance and reliability to defeat the most advanced adversaries.
About Allison Transmission
Allison Transmission (NYSE: ALSN) is the world’s largest manufacturer of fully automatic transmissions for medium- and heavy-duty commercial vehicles and medium- and heavy-tactical U.S. defense vehicles, as well as a supplier of commercial vehicle propulsion solutions, including electric hybrid and fully electric propulsion systems. Allison products are used in a wide variety of applications, including on-highway trucks (distribution, refuse, construction, fire and emergency), buses (school, transit and coach), motorhomes, off-highway vehicles and equipment (energy, mining and construction applications) and defense vehicles (wheeled and tracked). Founded in 1915, the company in Indianapolis, Indiana, USA. With a market presence in more than 80 countries, Allison has regional headquarters in the Netherlands, China and Brazil with manufacturing facilities in the U.S., Hungary and India. Allison also has approximately 1,500 independent distributor and dealer locations worldwide. For more information, visit allisontransmission.com.
Allison 1000 Transmission Features
Moderate changes have occurred to the transmission throughout the years however the platform itself has, for all intents and purposes, remained the same since 2001. The most notable modification has been the transition from a five to six speed model, which lowered cruising rpm by roughly 14% in high gear. This addition is particular attractive in terms of fuel consumption, as the lower engine speeds create an opportunity for greatly improved fuel economy on the highway. Rather than becoming outdated, the Allison has evolved to match the performance characteristics and demands of the Duramax turbodiesel, which has undergone significant changes itself through the years.
Manual transmissions are relatively rare for Duramax powered GMC/Chevrolet pickups, the primary reason being the attractiveness of the Allison 1000. General Motors was the first of the 'Big 3' to phase out a manual transmission option for their diesel - the ZF 6 speed was last offered for the 2006 model year. Modern automatic transmissions, such as the Allison 1000, are far superior to manual transmissions in almost every category. While a manual transmission is obviously a much simpler machine, there can be no integration between engine parameters and transmission shift schedule; such communication between powertrain components brings us innovative features that include engine braking and dynamic shift schedules. Additionally, the Allison 1000 is rated with a far greater input torque capacity than any outgoing manual transmission.
The Allison's external filter eliminates the need to frequently service the internal filter and greatly reduces maintenance time/cost. It also relies on adaptive technology which integrates the transmission with the engine control module to continuously monitor driver input and calculate ideal shift strategies for the particular driving conditions.
Allison 1000 Ratios
1st | 2nd | 3rd | 4th | 5th | 6th* | R |
3.094 : 1 | 1.809 : 1 | 1.406 : 1 | 1.00 : 1 | 0.711 : 1 | 0.614 : 1 | 4.480 : 1 |
* 6th gear available in 2006+ model years.
Allison 1000 Specs
Name: | Allison 1000 |
Production Plant: | White Marsh, Maryland (Baltimore) |
Applications: | • Light/medium duty diesel trucks |
Production Years: | • First produced in 1999 |
Gears/Speeds: | • 5 speed, 2001 to 2005 model years |
Weight: | ~ 330 lbs dry |
Max Input RPM: | 3,300 rpm (2015 MY spec) |
Nom. Max Input Torque: | • 520 lb-ft (01 - 05 MY) |
ATF: | Dexron-III (5 spd models) or Dexron-VI ATF (6 spd models), roughly 13 quart total fluid capacity and 7.4 quart refill capacity w/ filter change. |
Allison Automatic Transmission Fluid
Allison 1000 Strengths & Weaknesses
The Allison's obvious strength is its robust size, as the 1000 series transmission is designated for medium duty applications. Intuitively, this demonstrates that the transmission is inherently sufficient for class 3 and 4 GMC/Chevrolet pickups. The six speed model also has dual overdrives, with the second overdrive ratio being rather high. This allows for low engine speeds at cruising rpm and ultimately opportunities for significantly reduced fuel consumption in relative terms.
Allison Automatic Transmission Parts
The Allison is not without a few weaknesses, which include insufficient lubrication to the C3 clutch and the off-center engagement of the C1 and C2 clutches. Low fluid flow to the C3 clutch has been known to be a leading cause of premature failure in the Allison, although it's not generally a cause for concern and there exists no phenomenon of widespread failures as a result of this issue. The C1 and C2 clutch pistons engage their respective clutch systems from the side (off-center), which typically causes uneven wear on these clutch packs. Again, the problem is frequently noted during transmission rebuilds, but has not been largely attributed to premature transmission failure.
Allison Automatic Transmission Filter
Allison Automatic Transmission Fluid
A common occurrence for Duramax owners who chose to install aftermarket tuners/programmers (for performance improvements) is experiencing the transmission's 'limp mode'. This is a safety feature built into the Allison's programming which locks the transmission in 3rd gear if rapid or excessive slippage is detected. The concept is to protect the owner from being stranded as the result of serious transmissions problems, as the system identifies the slippage as abnormal and possibly a sign of severe problems. When this occurs, owners will experience a significant decrease in engine performance and reduced vehicle speed (performance and ratio limited).