The 1991 Dodge Dynasty is a comfortable front-wheel-drive sedan built on Chrysler's C-platform, sharing components with the New Yorker and Imperial. The Achilles' heel is the A604/41TE four-speed automatic transmission, which fails catastrophically and often takes out the oil cooler circuit with it.
A604/41TE Transmission Failure
Common · high severityTypical onset: 80,000-150,000 mi
Symptoms: Harsh or delayed shifts, especially 2nd to 3rd gear, Slipping under acceleration or refusing to upshift, Transmission overheating with burnt fluid smell, Complete loss of forward gears, limp mode only
Fix: Rebuild or remanufactured unit required. This transmission has solenoid pack failures, governor pressure sensor issues, and clutch pack burnout. Expect 8-12 hours labor for R&R plus rebuild time. Always replace the external oil cooler and flush lines during this job.
Estimated cost: $1,800-3,200
Transmission Oil Cooler Line Corrosion and Leaks
Common · medium severityTypical onset: 70,000-120,000 mi
Symptoms: ATF pooling under engine bay or dripping onto subframe, Low transmission fluid without visible external leak at pan, Transmission overheating warnings or erratic shifting
Fix: Steel cooler lines rust through where they pass near the radiator or along the frame rail. Replace both lines and the cooler itself if contaminated. 2-3 hours labor, requires lifting vehicle and sometimes dropping exhaust hanger.
Estimated cost: $250-500
3.0L Mitsubishi V6 Head Gasket Failure
Occasional · high severityTypical onset: 100,000-140,000 mi
Symptoms: White smoke from exhaust on cold start, Coolant consumption without visible leaks, Overheating under load or in traffic, Oil contamination with chocolate milk appearance in reservoir
Fix: The 3.0L V6 (not the 3.3L) has head gasket issues due to inadequate clamping force and coolant passage design. Both heads must come off, surfaces machined flat, and new multi-layer gaskets installed. Timing belt, water pump, and all coolant hoses should be done simultaneously. 12-16 hours labor.
Estimated cost: $1,200-2,000
Blower Motor Resistor and Switch Failure
Common · low severitySymptoms: Blower fan only works on high speed setting, No blower operation at all despite good fuse, Intermittent fan operation with burning smell from dash
Fix: The resistor block overheats and burns out, usually taking the blower switch with it. Resistor is behind glove box (30 minutes), but if switch is also fried you're pulling the dash bezel and climate control head unit (2 hours total).
Estimated cost: $150-350
Front Brake Caliper Seizure
Occasional · medium severityTypical onset: 80,000-130,000 mi
Symptoms: Vehicle pulling to one side during braking, One front wheel excessively hot after driving, Premature pad wear on one side, Burning smell or smoke from wheel well
Fix: Caliper slides seize due to corrosion, or pistons stick in the bore. Replace calipers in pairs, flush brake fluid, and resurface or replace rotors. Subject of recall but many units still have original calipers. 2-3 hours labor for both sides.
Estimated cost: $400-650
2.5L Turbo I (If Equipped) Oil Consumption and Bearing Wear
Occasional · high severityTypical onset: 90,000-140,000 mi
Symptoms: Blue smoke on deceleration or at idle, One quart oil consumption every 500-800 miles, Rod knock or bottom-end rattle on cold start, Low oil pressure warning light at idle when warm
Fix: The turbocharged 2.5L has piston ring wear and bearing clearance issues, especially if oil changes were deferred. Requires short-block replacement or full rebuild with new pistons, rings, bearings, and often crankshaft machining. 18-24 hours labor.
Estimated cost: $2,500-4,500
Only buy if the transmission has already been rebuilt with documented receipts, or you have $2,000 set aside for when it grenades—everything else is fixable, but that A604 is a ticking time bomb.
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.