Part 3: [1] [2] [3] [4] [5] [6] [7] [8] [9]
[Intro] [3/4-Ton 7% Grade] [1-Ton 7% Grade] [Diesel v Gas Comparison 7% Grade]
[3/4-Ton 15% Grade] [1-Ton 15% Grade] [Diesel v Gas Comparison 15% Grade]

[F-450 All Grades] [Summary]

Part 1: Introduction to the 2007 Heavy Duty Shootout
[Intro] [Detailed Truck Specs] [Dodge] [General Motors] [Ford] [Squat Test]

Part 2: Quarter-Mile Drags
[Intro] [3/4-Ton Unloaded] [3/4-Ton Loaded] [1-Ton Unloaded] [1-Ton Loaded] [F-450] [Diesel v Gas Comparison]

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.

NOTE:

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 W/Trailer Summary
2007 Dodge Ram 2500 Quad Cab 5.7-L V8 4x4 SRW 5-speed auto 3.73 2008 Ford F-250 Super Duty Crew Cab 6.8-L V10 4x4 SRW 5-speed auto 4.30 2007 GMC Sierra 2500 Crew Cab 6.0-L V8 4x4 SRW 6-speed auto 3.73
Cumulative Time
(sec)
Speed
(mph)
Time
(sec)
Speed
(mph)
Time
(sec)
Speed
(mph)
50-m / 164-ft 12.73 14.30 11.14 16.61 12.38 12.27
100-m / 328-ft 19.93 16.66 17.25 20.45 20.04 16.38
150-m / 656-ft 26.51 17.70 22.46 23.01 26.05 19.81
200-m / 984-ft 32.78 18.19 27.16 25.14 31.02 23.97
250-m / 1312-ft 38.93 18.36 31.53 26.93 35.55 28.23

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.

Part 3: [1] [2] [3] [4] [5] [6] [7] [8] [9]