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View listing at Fordpartsgiant; opens in a new tabS197 Mustang · Buyer's guide
2011-2014 Mustang GT 5.0L Main and A/C Belts, Tensioner and Idler Pulley
US/LHD 2011-2014 S197 Ford Mustang GT with the factory naturally aspirated 5.0L Coyote V8. Boss 302, GT500, every V6, 2005-2010 GT, 2015-plus, supercharger systems, accessory-drive conversions, engine swaps and universal belt/pulley claims are excluded.
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WHERE TO BUY
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What you need to know
Confirm factory naturally aspirated 2011-2014 Mustang GT 5.0L, VIN/build and stock accessory layout. Ford's workshop manual shows a six-rib serpentine FEAD belt with an automatic tensioner plus a separate V-ribbed A/C compressor stretch belt; the system is not manually adjustable and correct belt length, routing, pulley alignment and cleanliness matter. BR3Z-6B209-H and BR3Z-8678-A serve the main FEAD only; the A/C belt has no tensioner/idler. Ford directs cutting and discarding the old A/C belt and installing a new belt by the current specified procedure. Diagnose contamination, misrouting, pulley wobble/bearing roughness, tensioner travel/damping and accessory drag before replacing parts. Never lubricate or apply belt dressing to belts, pulleys or tensioner. Do not pry, improvise a route or assume either belt includes tools, tensioner, idler or mounting hardware.
OEM numbers
Main six-rib FEAD/serpentine belt BR3Z-8620-D. Separate A/C compressor belt BR3Z-8620-A -> BR3Z-8620-R. Main-FEAD service tensioner BR3Z-6B209-Hthe checked 2011 catalog shows early-production BR3Z-6B209-B replaced by H. Main-FEAD idler pulley BR3Z-8678-A. The separate A/C belt has no tensioner or idler. The tensioner includes its pulley on the checked LMR pathbelt, idler, mounting bolt and other hardware remain separate unless a listing expressly includes them.Supersession
Checked service chains are BR3Z-8620-A -> BR3Z-8620-R for the A/C belt and early-production BR3Z-6B209-B -> BR3Z-6B209-H for the tensioner. No supersession is asserted for main belt BR3Z-8620-D or idler BR3Z-8678-A. These are separate component/position families, not interchangeable numbers.
Fitment
Confirm factory naturally aspirated 2011-2014 Mustang GT 5.0L, VIN/build and stock accessory layout. Ford's workshop manual shows a six-rib serpentine FEAD belt with an automatic tensioner plus a separate V-ribbed A/C compressor stretch belt; the system is not manually adjustable and correct belt length, routing, pulley alignment and cleanliness matter. BR3Z-6B209-H and BR3Z-8678-A serve the main FEAD only; the A/C belt has no tensioner/idler. Ford directs cutting and discarding the old A/C belt and installing a new belt by the current specified procedure. Diagnose contamination, misrouting, pulley wobble/bearing roughness, tensioner travel/damping and accessory drag before replacing parts. Never lubricate or apply belt dressing to belts, pulleys or tensioner. Do not pry, improvise a route or assume either belt includes tools, tensioner, idler or mounting hardware.
Aftermarket options
Steeda 555-3361 is a checked billet idler/tensioner-pulley kit for 2011-2014 GT 5.0L; it is an aftermarket material/appearance path, not a Ford supersession and not a complete tensioner or belt kit. Other aftermarket belts were not retained as identity proof. Require exact belt position/length/rib count, stock pulley geometry, bearing state and included pieces.
Before you buy
US/LHD 2011-2014 factory naturally aspirated Mustang GT 5.0L only; Boss, Shelby, V6, supercharger and swap drives are excluded. The main six-rib FEAD belt and separate A/C compressor stretch belt are different positions; the main FEAD uses the tensioner/idler, while the A/C belt has neither. Ford directs cutting/discarding the old A/C belt and using the current specified installation method for the new belt. Confirm VIN/build, installed numbers, routing, rib count/length, pulley alignment, tensioner behavior and accessory drag. Never lubricate or use belt dressing. Belts, tensioner, idler, tools and hardware are not assumed bundled. Seller states are dated observations.
Research and fitment sources
Supersede reviewed 10 unique research sources for this guide. 6 also appear above as a seller or official action and are not repeated here; 4 additional citations follow.
Research last verified .