Ram vs Ford vs GM diesel
The big three diesels, side by side. Specs plus what I actually see in the shop.
| Ram 2500 — 6.7 Cummins | Ford F-250 — 6.7 Powerstroke | GM 2500 — 6.6 Duramax L5P | |
|---|---|---|---|
| Configuration | Inline-6 | V8 | V8 |
| Horsepower | 430 (high output) | 500 | 470 |
| Torque (lb-ft) | 1,075 (high output) | 1,200 | 975 |
| Transmission | 8-speed auto / Aisin (HO) | 10-speed auto | 10-speed Allison |
| Fuel system | CP4 (2019+) — watch it | New pump design (2023+) | Denso HP4 — solid |
| Known weak spot | Grid heater bolt, CP4 | EGR cooler (older), DEF sensors | DEF heater |
| Shop verdict | Simplest, easiest to work on | Most power, most complex | Best all-rounder right now |
From the shop: There is no bad choice here, only wrong priorities. Want the simplest engine to maintain yourself? Cummins. Want maximum towing numbers? Powerstroke. Want the fewest surprises? Duramax L5P. Buy on condition and maintenance history — a neglected truck of any brand will empty your wallet.
Read the deep dives: 6.7 Cummins reliability, 6.7 Powerstroke problems, Duramax L5P problems.