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AAM Adds New 4.56 OEM Designed Gear Set for Ram, Chevy Silverado and GMC Sierra Trucks

Posted: January 6, 2015

Detroit, Mich. – January 6, 2015 – AAM, a leading manufacturer of axle components, driveshaft components and repair kits for OE vehicles, has announced the addition of a new 4.56 ring and pinion gear set. The OEM-designed 4.56 gear set ratio (AAM part #40005988) is made for the 11.5” rear axle used in ¾- and one-ton 2003-2013 Ram and 2003-2014 Chevy Silverado and GMC Sierra trucks.


AAM ring and pinion gear sets are made using “two-cut” gear manufacturing processes to ensure the lowest tolerances possible for the quiet operation required by the company’s OEM customers. This two-cut design also allows for easier set-up for aftermarket replacement.


“The combination of materials, heat treating and gear geometry allows for a gear set that has 10 times the life of some non-OE gear sets,” said Greg Marsh, AAM engineering manager. “The strength of our materials, the elimination of noise, and the ease of installation add up to a superior gear set for the aftermarket.”


Marsh says one of the advantages of AAM gear sets is saving technicians’ time with a first-time, proper fit installation. He says machining tolerances held in AAM plants are so tight that most AAM gear sets can be installed into the vehicle, with rarely the need to change the original pinion shim.


AAM offers customers bearing or master install kits that come with the necessary components to complete the installation. The bearing kits contain all four differential bearings. The master install kits include the remainder of the components needed such as ring gear bolts, hub bolts, hub and cover pan gaskets.


AAM also offers additional components for the new rear 4.56 gear set such as an aluminum cover to reduce temperatures in high horsepower applications and front 4.56 9.25” gear sets for four-wheel-drive vehicles.


When technicians install the 4.56 gear set, Marsh recommends they replace all of the parts necessary including the bearings using AAM kits #74067011 (bearing kit Ram ’03-’13, GM ’01-‘10), #74067018 (bearing kit GM ’11-’14), #74010015 (master install GM 2001-2010), and #74010016 (master install Ram ’03-’13, GM ’11-’14). The bearing kits contain all four differential bearings. The master install kits contain the remainder of the components needed such as ring gear bolts, hub bolts, hub and cover pan gaskets, etc.


If the 4.56 gear set is being installed in conjunction with a lift kit, many customers like upgrading their cover pan to a stylish aluminum cover that also reduces temperatures in high horsepower applications (available as #74030017).
If the 4.56 gear set is being installed in a 4WD vehicle, the corresponding front 4.56 9.25” gear sets are #40024878 (GM mounting distance) and #40022464 (RAM mounting distance).


AAM parts are the same OEM production parts many shops have come to demand when installing replacement parts.

AAM parts fit right, install right and perform right the first time. For more information and to find a local distributor, visit www.demandaam.com, phone 313-758-4176, or email info@aam.com.


About AAM Aftermarket
AAM Aftermarket provides its customers with high quality, reliability, durability and performance in every aftermarket part it sells. AAM designs, engineers, tests and validates components to meet the same exacting specifications as the parts that they replace.


About AAM
AAM (NYSE: AXL) is a world leader in the manufacture, engineering, design and validation of driveline and drivetrain systems and related components and modules, chassis systems and metal-formed products for light trucks, sport utility vehicles, passenger cars and crossover vehicles and commercial vehicles. In addition to locations in the United States (Indiana, Michigan, Ohio, and Pennsylvania), AAM also has offices or facilities in Brazil, China, Germany, India, Japan, Luxembourg, Mexico, Poland, Scotland, South Korea, Sweden and Thailand. For more information on AAM, please visit www.aam.com.


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For more information, contact:
Pat Angst
Senior Manager
AAM Aftermarket
313-758-4176 • Patrick.Angst@aam.com


Christopher M. Son
Director, Investor Relations, Corporate Communications & Marketing
AAM Aftermarket
313-758-4814 • Chris.Son@aam.com

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