2005 CHRYSLER 300 SRT8

Typical onset: 80,000-140,000 mi

Symptoms: Harsh or delayed shifts, especially when hot, Transmission fluid in coolant or coolant in trans fluid (internal cooler leak), Limp mode or slipping under load, Burnt transmission fluid smell

Fix: External trans cooler replacement is straightforward (2-3 hours), but internal cooler failure contaminates the trans—requires full flush, often too late and trans needs rebuild (12-16 hours labor). Many owners add auxiliary coolers preventively.

Estimated cost: $400-800 for external cooler replacement; $3,500-5,500 for trans rebuild if contaminated

Typical onset: 100,000-150,000 mi

Symptoms: Low-frequency knocking on cold start that may fade or worsen, Oil pressure drop at idle when hot, Metal shavings in oil during changes, Sudden catastrophic knock and loss of power

Fix: Early 6.1L Hemis (2005-2006 especially) had inconsistent bearing tolerances and oiling issues under high RPM. Rod bearings typically go first. Requires short-block replacement or full rebuild—crank journal inspection, bearings, possibly pistons/rings if debris circulated (25-35 hours labor). Some do in-chassis bearing replacement (18-22 hours) if crank is still in spec.

Estimated cost: $4,500-7,500 for in-chassis bearing job; $7,000-12,000 for short block or full rebuild

Typical onset: 90,000-130,000 mi

Symptoms: White smoke from exhaust on startup, Coolant loss with no visible leaks, Overheating or erratic temp gauge, Oil milkshake (coolant in oil) or bubbling in overflow tank

Fix: MLS gaskets can fail if the engine was overheated or if head bolts weren't properly torqued. Both heads off, resurface if warped, ARP studs recommended. 16-20 hours labor. Often find additional issues (cracked head, corroded block deck) once apart.

Estimated cost: $3,000-5,000 including machine work and upgraded hardware

Symptoms: Excessive oil consumption (quart per 500-1000 miles), Blue smoke on deceleration or startup, Loss of compression in one or more cylinders, Check engine light with misfire codes

Fix: Cast pistons in 2005-2006 SRT8s are weak under sustained high RPM or boost. Ring lands crack, lose compression, and burn oil. Requires full teardown, forged piston upgrade strongly recommended (28-35 hours). Common in cars that saw track time or nitrous/supercharger.

Estimated cost: $6,000-10,000 for forged pistons, rings, bearings, and refresh

Typical onset: 60,000-100,000 mi

Symptoms: Clunk on hard acceleration or deceleration, Vibration at idle in Drive, Excessive driveline movement visible under throttle, Rattling over bumps from tunnel area

Fix: Rubber trans mount collapses from the torque. Straightforward replacement, but requires supporting trans on jack (1.5-2 hours). Polyurethane aftermarket mounts last longer but increase NVH.

Estimated cost: $250-450

Typical onset: varies—tank age dependent

Symptoms: Hard starting or long crank times, Hesitation or stumble under load, Fuel pump whine getting louder, Check engine light with lean codes

Fix: In-tank fuel filter (part of pump module) clogs from rust or debris in older tanks. Many 2005s have original tanks. Pump module replacement requires dropping tank (2.5-3 hours). Some find debris circulated into injectors, requiring cleaning or replacement.

Estimated cost: $600-1,200 for pump module; add $400-800 if injectors need service