2008 DODGE RAM 3500

Typical onset: 80,000-150,000 mi

Symptoms: Hard 2-3 or 3-4 shift flare, Transmission slipping under load or towing, Burnt ATF smell and dark fluid, Limp mode with P0841 or P0868 codes

Fix: The 68RFE behind the Cummins is chronically weak — clutch packs burn, valve body bores wear, and the overdrive drum cracks. Full rebuild with upgraded clutches and billet components takes 18-24 hours. Many owners go straight to aftermarket built units (Suncoast, etc.) to handle diesel torque properly.

Estimated cost: $3,800-6,500

Typical onset: 60,000-120,000 mi

Symptoms: Check engine light with P2002 or P0401 codes, Frequent regen cycles cutting power, Black smoke on startup, Poor fuel economy and loss of power

Fix: The 2007.5-2009 6.7L was the first-gen emissions setup and it's a nightmare. DPF clogs, EGR coolers crack and dump coolant into exhaust, EGR valves stick. DPF replacement is 4-6 hours, EGR cooler is 8-10 hours. Many owners delete emissions (off-road only, EPA violation for street use) which solves it permanently but kills resale and legality.

Estimated cost: $1,800-4,200

Typical onset: 70,000-130,000 mi

Symptoms: Ticking/tapping noise from engine bay, Loss of power and rough idle, Excessive oil consumption (1qt per 500-1000 mi), P0300-P0308 misfire codes

Fix: The Hemi in HD trucks sees higher loads and fails harder than in cars. Cam lobes wear flat, lifters collapse, and piston rings land and burn oil like crazy. Once cam is wiped, metal debris circulates and wrecks bearings. Engine-out rebuild with new cam, lifters, rings, bearings is 30-40 hours. Shortblock replacements common. This engine was not built for this duty cycle.

Estimated cost: $6,500-11,000

Typical onset: 60,000-100,000 mi

Symptoms: Loose or wandering steering feel, Clunking over bumps from front end, Tire wear on inside edges, Death wobble after hitting potholes

Fix: Solid front axle with heavy-duty tie rods that still wear out — sockets get sloppy, drag link ends go bad. Track bar bushings also fail and contribute to wander. Full tie rod/drag link/track bar refresh is 3-5 hours. This is maintenance on a heavy-duty truck, not a defect, but RAM owners see it more than Ford/GM equivalents. NHTSA had multiple recalls here.

Estimated cost: $800-1,600

Symptoms: Red ATF puddles under truck, Low transmission fluid warnings, Transmission overheating after towing, Visible rust/corrosion on cooler lines at radiator

Fix: Steel cooler lines rust through in salt-belt states, especially where they route near the frame. Leaks start small then blow out suddenly. Line replacement is 2-4 hours depending on how much you're replacing. Auxiliary coolers help but the factory setup still corrodes. Inspect these every oil change if you live where they salt roads.

Estimated cost: $400-900

Typical onset: 50,000-100,000 mi

Symptoms: Hard starting or long crank times, Fuel smell near driver-side frame rail, P0087 low fuel rail pressure code, Visible fuel weeping from filter housing

Fix: The factory plastic fuel filter housing on early 6.7L Cummins cracks from heat cycles and vibration. When it fails, you lose prime and suck air into the fuel system. Aftermarket billet housings are the permanent fix (AirDog, FASS). Replacement is 1-2 hours but you'll spend time bleeding air from the system. Do this proactively if you're keeping the truck.

Estimated cost: $350-700