2005-2010 Ford Mustang S197 4.0L V6 Engines and Long Blocks: Transmission, Balance-Shaft and Written-Contents Identification

The checked evidence does not support one universal 2005-2010 service-engine identity. Early fully dressed automatic 5R3Z-6007-BA resolves to 5R3Z-6006-AARM while manual 5R3Z-6007-CA resolves to 5R3Z-6006-CARM. Later automatic 6R3Z-6006-AA and 8R3Z-6007-AA resolve to 7R3Z-6006-CARM; the checked 2008 manual 8R3Z-6007-CA resolves to 7R3Z-6006-DARM. The 2009 catalog exposes 9R3Z-6006-BRM for the manual branch. Short block 5L2Z-6009-AA resolves to 6L2Z-6009-AA but remains a short block with pan/pickup separate. Service-engine supersession is not proof that seller accessories, transmission preparation or balance-shaft equipment are identical.

Begin with both 17-character VINs, door-label build dates and clear photographs of the original and donor engine/service tags, block and head castings, bellhousing face, crank/flexplate or flywheel interface, oil pan, front cover and every connector. Confirm factory VIN-N 4.0L SOHC V6 and resolve automatic versus manual plus balance-shaft state in writing. Match engine mounts, starter/bellhousing pattern, crank/flexplate or flywheel, oil-pan/pickup clearance, front cover and timing equipment, intake/exhaust and cooling connections, accessory brackets/pulleys, sensors, harness and controls. Require a photo-backed inventory of block, heads, valve and front covers, pan/pickup, oil and water pumps, intake, throttle, exhaust manifolds, injectors/rail, ignition, sensors, harness, accessories, mounts, balancer and flywheel/flexplate; none is presumed from long block, complete or fully dressed. Ask for mileage, donor-running video or records, codes, oil pressure, compression/leak-down, oil/coolant condition, pan/filter debris and timing-noise evidence where available. Reject overheating, oil starvation, hydrolock, coolant/oil mixing, low or uneven compression, abnormal timing or bottom-end noise, cracked or welded castings/mounts, damaged crank/splines/threads, cut wiring, broken connectors, open or contaminated ports, water/fire/flood exposure and undisclosed modification. Drain lawfully, cap openings, secure on a stable pallet or crate and document freight, core, warranty and returns. Use qualified installation and current Ford service information for fluids, priming, cooling, controls, security and emissions acceptance without bypass or defeat.

A remanufactured long block is acceptable only when the supplier identifies the exact Mustang VIN-N application, automatic/manual preparation and balance-shaft state and writes every included/excluded component, core rule, machining/test process, warranty, labor coverage, freight and return term. Checked branches included automatic/no-balance-shaft L4005NBSM, ATK DFDJ, e-r-n_1562-9 and GPTLNN4005NBSM36AA and manual/with-balance-shaft e-r-n_1562-10. The 40-244-LB-DR-XP1 seller path did not itself resolve transmission/balance-shaft state, so confirmation is mandatory. Shared 4.0L truck/SUV family claims, universal swap packages and bypass or emissions-delete equipment remain outside this guide.

US/LHD 2005-2010 factory VIN-N Mustang 4.0L V6 only. Match both VINs/builds, the original and donor tags/castings, automatic/manual preparation, balance-shaft state, pan/pickup, controls and every written included item. Long block, service engine, short block and fully dressed engine are not synonyms. No exact service identity is extended across an unsupported year or transmission branch. Reject internal-damage, overheating, contamination, cracked/welded, fire/flood or undocumented modified donors; use protected freight and qualified installation, controls and emissions acceptance.

Supersede reviewed 20 unique research sources for this guide. 7 also appear above as a seller or official action and are not repeated here; 13 additional citations follow.

Research last verified 2026-08-06.

1. Fordpartsgiant — service engine and short blockOpen source
2. Fordpartsgiant — service engine and short blockOpen source
3. Fordpartsgiant — service engine and short blockOpen source
4. Fordpartsgiant — service engine and short blockOpen source
5. Fordpartsgiant — service engine and short blockOpen source
6. Fordpartsgiant — engine assembly fully dressedOpen source
7. Fordpartsgiant — engine assembly fully dressedOpen source
8. Ford Service Information — 05musog1eOpen source
9. Ford Service Information — 10musog1eOpen source
10. Latemodel cachefly — tsb10 18 11Open source
11. Parts ford — PowertrainCatalogOpen source
12. Melling — 3 701SAX webOpen source
13. PartSouq — vehicleOpen source