Change applies to medium- and full-size light-duty as well as heavy-duty pickups

General Motors will use base curb weights, instead of weights measured after certain equipment is removed, to calculate payload ratings on their light- and heavy-duty pickups.

As part of a spat between Ram and Ford over “best-in-class” honours for Class 3 pickups, a GM spokesperson stated their own trucks use base curb weights when calculating payload capability. The statement turned out to be false, with General Motors doing the same light-weighting as Ford before calculating payload numbers.

Related: Redesigned GM Trucks To Arrive Early, Wear Aluminum Body Panels

Automotive News reports this will no longer be the case and General Motors will use base curb weights to calculate payload ratings in the future. The change will go into effect on their 2015 Chevrolet Silverado, Chevrolet Colorado, GMC Sierra, and GMC Canyon light-duty pickup trucks, expected to go into production in the fourth quarter of this year.

Heavy-duty trucks, introduced earlier this year, will see the changes immediately. GM states they will update specifications for the 2015 lines of HD trucks.

Related: First Drive: 2015 GM HD Trucks (GMC Sierra and Chevrolet Silverado 2500/3500)

The practice will continue at Ford.

“We have made no changes to the way we determine maximum payload ratings for Ford F-Series Super Duty,” a Ford spokesman said today to AN.

Ram, Toyota and Nissan use base curb weights for calculating payload ratings.

2015 Chevrolet Colorado

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