Steady at 40 mph speed limit.

Drivers, the highway speed limit is still 40 mph unless your M939-series 5-ton truck has the MWO 9-2320-272-55-1 applied.

TACOM Safety-of-Use Message (SOUMI 00018 (Jul 00), Resumption of Safe Operating Speeds for M939 Family of Vehicles Following Retrofit of

Anti-lock Braking System (ABS), authorizes you to resume normal operating speeds only after MWO 9-2320-272-55-1 is applied.

Application of ABS to your trucks rescinds the requirement for MWO 9-2320-272-20-7 and removes the brake proportioning valve installed during that modification. Never add MWO -20-7 to a truck that has been modified by MWO -55-1. It's not needed then.

Trucks with the ABS MWO have a yellow triangular decal with black lettering "ABS" in the lower left corner of the windshield. Of course, there'll be a regular MWO tag on the cab reinforcement just inside the driver's door, too.

MWO 9-2320-272-20-7, which still has not been applied to some vehicles in the fleet, installed a brake proportioning valve kit to prevent front-wheel lockup during heavy braking when driving on slick surfaces with little or no load on-board.

TACOM SOUM 98-07 (Apr 98), Safe Operating Speeds for M939 Series Trucks, dropped speeds to 40 mph and outlined safe driver practices. It is still in effect until MWO -55-1 is installed.

KID, I'M WRITING YOU UP FOR GOING OVER 40 MPH WITHOUT AN ABS STICKER

[ILLUSTRATION OMITTED]