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• Allison Transmission Serial Number Lookup
• Allison Transmission Parts By Serial Number
• Allison Transmission Serial Number Location
• Allison Serial Number Decoder
• Allison Transmission Serial Number Decoder

Heavy duty automatic transmission with parking pawl. ALLISON IDENTIFICATION TAG. Starting with serial number Range Pressure @ 600 RPM Pressure @ 2100 RPM Reverse 800-1380 kPa ( 115-200 psi ) 1515-1795 kpa ( 220-260 psi ). Allison Transmission Internet Allison HUB. Identify your transmission using the serial Number. Registered Guests, Allison Transmission Employees and Allison. Mt654cr transmission shifting charateristics and tendencies discussion hello everyone, I would like to start a thread specifically about how the mt654cr trans acts while upshifting/downshifting. My truck is a 1990 am general m923a1.

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 Rather than becoming outdated, the Allison has evolved to match the performance characteristics and demands of the Duramax turbodiesel, which has undergone significant changes itself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.

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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

Allison Transmission Serial Number Lookup

* 6th gear available in 2006+ model years.

Allison Transmission Parts By Serial Number

Allison 1000 Specs

Allison Transmission Serial Number Location

Allison 1000 Strengths & Weaknesses

Allison Serial Number Decoder

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.

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 Transmission Serial Number Decoder

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).