Allison Automatic Transmission

Nov 30, 2018 Allison is the world’s largest manufacturer of fully automatic transmissions and hybrid propulsion systems for commercial-grade vehicles. These transmissions can be found at work in a wide variety of applications, from mining and school buses. Contact Us to learn more about rebuilt Allison transmissions or to find a part for your series. Initially the Allison 1000 was a 5 speed transmission, rated to handle up to 620 lbft (841 Nm) of torque. A new 'Generation 4' 1000 was introduced in 2005 that added a 6th gear at the very top of the ratio ladder, making it a double-overdrive.

The 1000 series (and similar 2000 and 2400 series) is a line of automatic transmissions for on-road trucks. All are 5 or 6-speed electronically controlled units and are manufactured by Allison Transmission in Indianapolis, Indiana as well as in Baltimore, Maryland.

Allison 1000[edit]

Initially the Allison 1000 was a 5 speed transmission, rated to handle up to 620 lb·ft (841 N·m) of torque. A new 'Generation 4' 1000 was introduced in 2005 that added a 6th gear at the very top of the ratio ladder, making it a double-overdrive. For the 2006 model year, manual gear selection was introduced. This feature gives the driver greater control over the transmission, enhancing operation when engine braking or less frequent shifting is desired.

Allison 1000

Allison 1000 cutaway

Gear ratios:

1	2	3	4	5	6	R
3.10	1.81	1.41	1.00	0.71	0.61 (06+)	4.49

Applications:

Chevrolet Kodiak/GMC Topkick

Allison 2000[edit]

The Allison 2000 is rated to handle up to 620 lb·ft (841 N·m) of torque.

Gear ratios:

1	2	3	4	5	R
3.51	1.90	1.44	1.00	0.74	5.09

Applications:

B-7 bus
C-Series truck
F-Series truck (Ford F-650)
International XT Series

Allison 3070/4070[edit]

Applications:

Allison 3700SP[edit]

Applications:

Family of Medium Tactical Vehicles (FMTV)
BAE Caiman MRAP

Allison Transmission Models

Allison transmissions are the only fully automatic models on the market. Through the years, Allison has updated and upgraded their technology, which they call “Generations”. This can make it a bit confusing when trying to find parts.

Pro Tip: When finding parts for your Allison Transmission, make sure you know what generation your transmission is.

Allison Generation 5

In 2012 Allison upgraded to the Generation 5 model, which is still in use today. The 1000/2000 series made the switch first, and then the 3000/4000 series followed. Differences:

This series focuses on prognostics, constantly monitoring operating parameters and notifying the driver if there’s an issue. This includes oil and filter monitoring, and transmission health monitoring. The shift selectors were also re-designed.

Allison Generation 4

These transmissions started to appear in trucks in the early 2000s, around 2004/5 time frame. Difference included:

More sensors, more diagnostic capabilities, and advanced configurations of the Allison Transmission product line.

Allison Generation 3

In1998, the Allison Generation 3 replaced the original WTEC II transmission controls. Theis generation ushered in the computer-based diagnostic era, which meant you could use a variety of diagnostic tools to connect to the Allison Transmissions to read codes, clear codes, perform diagnostic commands, and more. Other differences:

The controls for the Allison Transmission were updated, offering several different styles.

Allison WTEC

The oldest Allison Transmission configuration was the WTEC. If your commercial truck, RV, or machine is from before 1998, it probably has a WTEC II transmission. This series had no diagnostic software or computer, but you could retrieve codes from the shift selector.

Popular For a Reason

Allison is the world’s largest manufacturer of fully automatic transmissions and hybrid propulsion systems for commercial-grade vehicles. These transmissions can be found at work in a wide variety of applications, from mining and school buses.