The 2011 Ram 3500 with 6.7L Cummins is a workhorse diesel that's mechanically solid in the engine department, but the 68RFE six-speed automatic transmission is its Achilles heel—expect transmission-related issues to dominate your repair budget and downtime.
68RFE Transmission Failure / Rebuild
Common · high severityTypical onset: 100,000-180,000 mi
Symptoms: Hard or delayed shifts, especially 2-3 and 5-6, Slipping under load or when towing, Limp mode with P0734 or P0871 codes, Shuddering during lockup
Fix: Full rebuild with upgraded clutches, solenoid pack, and valve body. Factory units are marginal for heavy towing; aftermarket builders often include billet input shaft and updated pressure springs. 18-24 labor hours for R&R and rebuild.
Estimated cost: $4,500-7,500
Torque Converter Lockup Shudder and Failure
Common · medium severityTypical onset: 80,000-140,000 mi
Symptoms: Vibration at 45-55 mph that feels like driving over rumble strips, P0741 TCC performance code, Transmission overheating, Metal shavings in pan during fluid service
Fix: Torque converter replacement requires transmission removal. Often done in conjunction with valve body update and solenoid pack refresh. 12-16 labor hours.
Estimated cost: $2,800-4,200
Transmission Solenoid Pack Failure
Common · medium severityTypical onset: 70,000-120,000 mi
Symptoms: Erratic shifting, especially into overdrive, P0871 overdrive pressure switch code, Harsh 1-2 or 2-3 shifts, Transmission stuck in one gear
Fix: Solenoid pack replacement requires pan drop and valve body removal. OE solenoids are failure-prone; many techs recommend upgraded aftermarket packs. 4-6 labor hours.
Estimated cost: $800-1,400
Transmission Cooler and Lines Leaking
Occasional · medium severityTypical onset: 90,000-150,000 mi
Symptoms: ATF puddles under truck, especially after highway driving, Low fluid level on dipstick, Overheating transmission temps, Visible corrosion or seepage at cooler fittings
Fix: Steel lines rust through at bends or cooler connections. OE cooler is marginal for heavy towing; many owners upgrade to larger aftermarket unit. 3-5 labor hours for lines and cooler.
Estimated cost: $600-1,200
Transmission Mount Failure
Occasional · low severityTypical onset: 60,000-110,000 mi
Symptoms: Clunk when shifting from park to drive or reverse, Excessive driveline vibration, Visible transmission sag or torn rubber in mount
Fix: Rubber isolator deteriorates, especially with heavy loads. Requires supporting transmission and replacing crossmember mount. 1.5-2.5 labor hours.
Estimated cost: $250-450
DEF (Diesel Exhaust Fluid) System Issues
Occasional · medium severityTypical onset: 80,000-130,000 mi
Symptoms: DEF quality warning on dash, 5 mph derate countdown, P20EE SCR NOx catalyst efficiency code, DEF heater failure in cold climates
Fix: Common failures include DEF tank heater, injector, or quality sensor. Tank heater is most frequent in freeze-thaw regions. DEF injector requires exhaust work. 2-4 labor hours depending on component.
Estimated cost: $400-1,200
Grid Heater Relay Failure
Occasional · low severityTypical onset: 70,000-140,000 mi
Symptoms: Hard cold starting below 20°F, P0542 intake air heater circuit code, Clicking from relay box during cranking, No glow plug wait light
Fix: Relay contacts burn out over time; relay is in PDC (power distribution center) under hood. Simple replacement, but relay is expensive OE part. 0.5-1 labor hour.
Estimated cost: $200-350
Buy the Cummins engine, plan to rebuild or upgrade the 68RFE transmission—it's a question of when, not if, especially if you tow heavy.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.