AMG M104 3.4L 24v Engine & 722.5 5-Speed Transmission

Acquire a legendary piece of AMG history with this complete, numbers-matching M104 3.4-liter 24v inline-6 engine and 722.5 5-speed automatic transmission. This powertrain was the heart of a 1992 Mercedes-Benz 300CE 3.4 AMG (C124 Coupe), verified by its data card and the presence of the 957 AMG code. With a documented history of just ~65,000 miles (105,000 km) and confirmed to be in good working order, this is a turn-key opportunity to own one of the most desirable naturally-aspirated engines from AMG’s pre-merger era. Sold as a complete assembly with all ancillaries, it’s the perfect foundation for an authentic restoration or an epic engine swap into a modern classic.
Key Features & Specifications:

Authentic AMG 3.4L Engine: The genuine M104 AMG 3.4-liter inline-six, producing 268 hp and 243 lb-ft torque. Features a unique crankshaft, pistons, and camshafts from AMG. Engine number: 104980-12-035697.

Rare European 5-Speed Transmission: The original, matching 722.5 5-speed automatic transmission (number: 722501-03-764057), a significant upgrade over the common 4-speed, providing better performance and fuel economy.

Ultra-Low Mileage & Proven Condition: Removed with only ~65k miles. Video available of the engine turning over, confirming its mechanical integrity before removal.

Complete “Drop-In” Package: Includes everything needed for installation: alternator, water pump, A/C compressor, engine/transmission mounts, wiring, exhaust manifolds, and the highly sought-after AMG-specific airbox.

Verified Provenance: Documented with the 957 AMG data code and a history spanning Germany, Japan, the UK, and the US, confirming its authentic, federalized AMG status.
Technical Specifications:

Engine: AMG M104 3.4L 24-Valve Inline-6

Engine Number: 104980-12-035697

Horsepower: 268 hp

Torque: 243 lb-ft

Transmission: Mercedes 722.5 5-Speed Automatic

Transmission Number: 722501-03-764057

Source Vehicle: 1992 300CE 3.4 AMG (C124 Coupe)

Odometer: ~105,000 km / ~65,000 miles

Condition: Good working order; fluids drained for shipping.
Perfect For:

Restoration: The definitive powertrain for a 300CE 3.4 AMG (C124) or 300E 3.4 AMG (W124) in need of its original heart.

Engine Swaps: The ultimate powertrain upgrade for a Mercedes W201 190E, R107 SL, W126 S-Class, or W114/W115 “Fintail”.

Modern Classic Builds: An ideal, period-correct swap for projects like a Porsche 914, BMW E30, or Volvo P1800.

Collector’s Item: A sound investment as a complete, numbers-matching unit from AMG’s most iconic era.
Package Includes:

(1) Complete AMG M104 3.4L 24v Engine

(1) Mated 722.5 5-Speed Automatic Transmission

AMG M104 Airbox (minor damage, easily repairable)

Alternator, A/C Compressor, Power Steering Pump

Water Pump, Oil Pump, Drive Belts

Engine & Transmission Mounts

Exhaust Manifolds, A/C Lines, and associated wiring
Why This AMG Powertrain is a Rare Find:

Provenance: A true, federalized AMG with international history, not a retrofitted clone.

Performance Pedigree: The 3.4L M104 is one of the most responsive and sonorous engines ever built by AMG.

Completeness: Saves countless hours and expense sourcing ancillary components.

Low Mileage: Exceptional for a 30-year-old performance engine, indicating minimal wear.