2026 Ram Heavy Duty Longhorn 6.7L Diesel
The 2026 Ram Heavy Duty Longhorn 6.7L Diesel is a 430-hp 6.7-liter turbocharged inline-6 with an 8-speed automatic and four-wheel drive.
| Spec | Value |
|---|---|
| Engine | |
| Engine Type | I6 Cummins High-Output Turbo Diesel, OHV, 24-valve (hydraulic lifters) |
| Displacement | 6.7 L |
| Horsepower | 430 hp @ 2,800 rpm |
| Torque | 1075 lb-ft @ 1800 rpm |
| Redline | 3,200 rpm |
| Valvetrain | OHV |
| Bore and Stroke | 107.0 x 124.0 |
| Compression Ratio | 16.2:1 |
| Injection Type | High-Pressure Common Rail (HPCR) electronic injection |
| Drivetrain | |
| Drive Type | 4x2 standard / 4x4 optional |
| Transmission | |
| Transmission | 8-speed automatic (8AP1075) |
| 1st Gear | 4.71 (19 mph **) |
| 2nd Gear | 3.14 (29 mph **) |
| 3rd Gear | 2.1 (44 mph **) |
| 4th Gear | 1.67 (55 mph **) |
| 5th Gear | 1.29 (71 mph **) |
| 6th Gear | 1 (92 mph **) |
| 7th Gear | 0.84 (109 mph **) |
| 8th Gear | 0.67 (137 mph **) |
| Reverse | 3.3 |
| Final Drive | 3.42 |
| Fuel Economy | |
| Recommended Fuel | Ultra Low Sulfur Diesel (ULSD) |
| Suspension | |
| Front Suspension | Three-link with track bar, coil springs, stabilizer bar |
| Rear Suspension | Five-link with track bar, coil springs, stabilizer bar (2500); Two-stage longitudinal leaf spring (3500) |
| Front Stabilizer Bar | Standard |
| Rear Stabilizer Bar | Standard |
| Brakes | |
| Front Brake Calipers | Twin-piston |
| Front Brake Disc | 14.17 x 1.54 in (359.9 x 39.1 mm), ventilated disc, twin-piston caliper |
| Rear Brake Disc | 14.09 x 1.34 in (357.9 x 34.0 mm), ventilated disc, twin-piston caliper |
| Tires & Wheels | |
| Wheels Front | 20-in polished aluminum |
| Wheels Rear | 20-in polished aluminum |
| Tires Front | 275/60R20 all-season |
| Tires Rear | 275/60R20 all-season |
| Dimensions & Weight | |
| Length | 238.8 in |
| Width | 83.5 in |
| Height | 80.2 in |
| Wheelbase | 149 in |
| Front Track | 68.7 in |
| Rear Track | 68.1 in |
| Ground Clearance | 13.1 in |
| Approach Angle | 22.9° |
| Departure Angle | 25.8° |
| Interior | |
| Headroom Front | 40.9 in |
| Headroom Rear | 39.8 in |
| Legroom Front | 40.9 in |
| Legroom Rear | 40.2 in |
| Shoulder Room Front | 65.9 in |
| Shoulder Room Rear | 65.6 in |
| Hip Room Front | 62.9 in |
| Hip Room Rear | 62.7 in |
** Theoretical max speed per gear at redline