Engines & Transmissions

The most trusted power and propulsion systems for nearly every application—from commercial trucks to off-highway machines, and everything in between.

World-Class Commercial Engines

Today's commercial engines must meet the demand for power with efficiency. We represent some of the most sophisticated and technologically advanced engines on the market today. Find the right engine for nearly every application.

  • Detroit Diesel

    Engines from 45hp to 3650hp. We carry the following Detroit Diesel products: DD13, DD15, DD16, Series 700, Series 40, Series 50, Series 60.

  • Deutz High Speed Diesel

    Engines from 20hp to 670hp. We carry the following products from Deutz High Speed Diesel: 2009 Series, 2011 Series, 2012 Series, 2013 Series, 2015 Series, and 914 Series.

  • mtu

    Engines from 100 to 3000 hp. We provide solutions for all off-highway applications.

  • Isuzu

    Engines with power outputs ranging from 11.8 to over 500 hp. We provide solutions for all off-highway industrial applications including marine applications.

  • Yanmar

    Engines in the 4hp to 500hp range. We carry the Yanmar L Series and Yanmar TNV Series engines.

  • Mercedes Benz

    We carry the MBE 300, 400, 500 and 900.

Powerful Heavy Duty Transmissions

Shift performance to a new level. The products we represent are known throughout the world for their performance and durability.

  • Allison™ Transmissions

    The industry's most depended-upon name. We carry the following Allison products: 1000—3000 Pupil Transportation/Shuttle Series (PTS), 1000—4700 Rugged Duty Series (RDS), 1000—4500 Highway Series (HS), 1000—4800 Emergency Vehicle Series (EVS), and the 1000—4000 Motor Home Series (MHS).

  • Allison™ ReTran®

    Every genuine Allison ReTran transmission is remanufactured from the Allison Transmission facility using exclusively genuine Allison parts and original factory specs.

  • Weller Transmissions

    Transmissions rebuilt to original factory specifications. Products include: Automatic Transmissions (Medium Duty and Heavy Duty), Manual Transmissions (Medium Duty and Heavy Duty), Hybrid Transmissions (Medium Duty and Heavy Duty).


To purchase a new platform, please contact a W.W Williams location near you.



We are a distributor for top manufacturers, including Allison Transmission, Detroit Diesel, and more.

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