General Engine Products

General Engine Products, a wholly-owned subsidiary of AM General is the Original Equipment Manufacturer (“OEM”) and designer of diesel engines and transmissions used in military and commercial applications.

General Engine Products (GEP) manufactures powertrain and drivetrain components to support AM General vehicle platforms as well as commercial, military and industrial markets.

We are the sole producer of the Optimizer 6500® V8 Diesel Engine, which proudly supports and sustains AM General vehicle platforms deployed by the United States military, the ministries of defense of our partners around the globe, and within various commercial and industrial markets.


Optimizer 6500®-290 — 160 hp / 290 lb.-ft.

Naturally-aspirated and mechanically controlled


Optimizer 6500®-380 — 190 hp / 380 lb.-ft.

Turbocharged and mechanically controlled


Optimizer 6500®-410 — 205 hp / 410 lb.-ft.

Turbocharged and mechanically controlled


General Transmission Products

The 4L85E transmission is a close-ratio four-speed automatic transmission that serves the heavy-duty service market, including AM General's Humvee, full-size vans, shuttle buses, delivery trucks and light motor homes.

The transmission has been refined and improved over 18 years, has been used in Humvee vehicles for 15+ years and continues to provide reliable performance on extreme terrain and climate conditions.
Incorporating electronic control modules, the 4L5E transmission provides consistent and precise shift points and shift quality.

These controls continuously monitor shift timing, internal and external conditions and adjust shifts for consistency. Shift stabilization limits the amount of hunting between gears when traveling through mountains, with or without a trailer.


The transmission of choice for AM General’s Humvee family of vehicles


Robust, durable, reliable and smooth shifting


Low warranty costs


Global distribution and service parts network


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Suspension Systems
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