Three-Quarter-Ton Gas Pickups - 15% Grade W/10,500# Trailer:
The 15% grade was where we separated the men from the boys. Inclinations this steep expose even the slightest powertrain and platform weaknesses. And there was almost no time for a truck to recover and mask any shortcomings in its powertrain during the brief 820-foot run.
Due to space and readability considerations, the bar graphs below only show the test results from 100-m (300-feet) to 250-m (820-feet). See the table at the bottom for full test results from 50-m to 250-m.
All times and speeds measured are shown cumulative over the run.
In the graphs below: the lower a truck's bar is, relative to the other two trucks' bars, in the "Time Over 250-Meters" graph the better it performed. The higher a truck's bar is, relative to the other two trucks' bars, in the "Speed over 250-Meters" graph, the better it performed.
The shortest time required to cover the 250-meter distance determined the best performing truck.
Three-Quarter-Ton Gas Pickups 15% Grade Assessment:
The V10 powered F-250's timing was even better during the 15% incline than the 7% hill, relative to the Sierra and Ram times in the same tests. The 4.30 rear was a huge help, but the V10's monster torque was also required to get off to a dominant 16.61-mph start in the first 50-m. Ford's gas engine team should be very proud of how this truck performed on such a radical slope.
The Sierra also performed ok. But we wonder how much closer or different the results would have been if the old 8.1-liter big block V8 was still available for the GMT900 heavy dutys.
But the Ram. Whoa. It fell flat in this contest. In first gear the 5.7-liter HEMI V8 got off to a good start, neck and neck with the 6.0-liter Vortec Max in the GMC, but as soon as the HEMI shifted into that tall 1.67:1 second gear (that we first mentioned during the level 1/4-mile hauling tests) the truck could only lug its way up the rest of the hill. It was a graphic example of how a single mismatch in components caused a giant stumble in performance during this stress test.