Dodge Durango SRT
392 cubic inches, 4.09-inch bore, 485 hp — the biggest factory NA V8 of the 2020s. Forged steel crankshaft where the 5.7 uses cast iron — the real upgrade. Powder metal rods, cracked-cap design. Pistons are hypereutectic, not forged — ring lands too thin for boost, supercharger kits crack them. Same MDS lifter failure on automatics — engine replacement $15,000. Manual 392s skip MDS. VVT and active intake give 45 lb-ft more than the old 6.1 SRT. On 0W-40 at 5k intervals, the rotating assembly outlasts the car.
475 hp family hauler, zero compromise
The 6.4L Durango SRT is a sports car with three rows. Brembo, adaptive suspension, launch control.
Engine Weaknesses 4
Same MDS failure as the 5.7 but with higher stakes. Deactivated rollers destroy camshaft, metal contaminates oil. Engine replacement $4,800-15,000 — replacements can fail the same way. Class action: Petro v. FCA. Manual 392s have NO MDS.
Symptoms: Progressive ticking to knocking, misfires, check engine light, metal in oil
Stock cast pistons not designed for boost. Ring land too close to crown, ring gap too wide. Supercharger or turbo kits crack pistons. Forged internals required before adding boost. Only affects modified engines.
Symptoms: Misfires under boost, loss of compression, knocking, catastrophic failure
Cast-iron manifold on aluminum head — thermal expansion mismatch breaks studs. Grade 8 replacement studs (6509863AA) are the fix.
Symptoms: Ticking on cold start from exhaust leak, disappears as metal expands
Same tick as the 5.7 from MDS valvetrain. Tick persisting past warmup signals lifter damage. 0W-40 synthetic at 5,000 mile intervals is the best prevention.
Symptoms: Ticking on cold start, may persist or disappear after warmup
Vehicle Weaknesses 7
Totally Integrated Power Module fails without warning. No-start, fuel pump relay sticks, all warning lights. Primarily 2011-2013.
8-speed auto (845RE/ZF 8HP) develops shuddering during low-speed acceleration. Worn torque converter clutch is the primary cause.
Alternator may suddenly fail. Recall P60 covers 2011-2014 models.
Full-width LED taillight leaks water through degraded seals. Class action filed (Cranstoun v. FCA).
Upper rear shock mounts develop play — design flaw, not normal wear.
Touchscreen delaminates within 2-4 years. Substitute manufacturer in 2017-2018 used defective adhesive.
Front rotors warp prematurely due to heavy curb weight.
