ACDelco 8K991 Serpentine Belt

Serpentine Belt

Fits: 97-98 Ford Club Wagon, 97-01 Ford E-150 Econoline, 97-01 Ford E-150 Econoline Club Wagon, 97-01 Ford E-250 Econoline, 97-00 Ford E-350 Econoline, 97-01 Ford E-350 Econoline Club Wagon, 97-99 Ford Econoline Super Duty, 97 Ford Expedition, 97-03 Ford F-150, 97-01 Ford F-250, 99-01 Ford E-350 Super Duty, 99-01 Ford E-450 Econoline Super Duty, 99-01 Ford Econoline, 99-01 Ford F-350, 00-01 Ford Excursion, 01-03 Ford Lobo, 04 Ford F-150 Heritage, 04-07 International 9400i SBA, 04-07 Peterbilt 379, 04-07 Sterling Truck AT9500, 04 Sterling Truck L9500, 04 Sterling Truck LT9500, 05-07 Freightliner Classic, 07 Freightliner Century Class, 07 Freightliner Coronado, 07 Freightliner FLD120, 07 Freightliner FLD120SD, 07 Freightliner FLD132, 11 IC Corporation BE School Bus, 12 IC Corporation CE School Bus

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ACDelco Professional, premium aftermarket V-Ribbed Advanced Technology Belts serve as replacement belts for accessory belt drive systems (ABDS) and other serpentine belt applications. They are designed using advanced manufacturing technology and premium EPDM rubber construction to provide customers with superior accessory belt drive systems (ABDS) and new-vehicle-type performance. These premium aftermarket replacement v-ribbed advanced technology belts are manufactured to meet your expectations for fit, form, and function.



  • Able to operate and accept misalignment in the accessory belt drive systems (ABDS) far greater than other serpentine belts
  • Is the belt of choice by professional technicians, lasting 50% to 60% longer than retail belts (low priced belts sold at car part stores)
  • Its flexible construction allows the belt to withstand billions of topside and backside bends resulting in a long belt life
  • Its precision dimension control of rib profile transmits load efficiently throughout the accessory belt drive systems (ABDS) allowing components to operate at optimum levels
  • Made with temperature and crack resistant EPDM rubber for a long life and quiet, dependable performance
  • Manufactured using quality materials to help provide long life, minimize noise, reduce loss of tension, and solve problem applications


FAQ - A1Yes, this may be indicative of an alignment issue or a failed tensioner.
FAQ - A2Yes, you may lose your power steering or stall out. Your car is not drivable when your drive belt fails.
FAQ - A3Yes, the leading causes of belt failure are improper tension and misaligned pulleys. Both these conditions cause excessive heat which leads to belt failure. Have your belts checked every 3,000 miles for belt wear, proper tension, and pulley alignment.
FAQ - A4No, when the belt backing has been torn or cracked, the belt should be replaced.
FAQ - A5No, use the belt in the way it's listed in the ACDelco belts and hoses catalog.
FAQ - A6No, remember the leading cause of belt failure is improper tension and misaligned pulleys. Improper tension will cause the belt to slip and you may notice a loss of performance from the air conditioning system as well as increased heat under the hood. High heat can lead to premature accessory failure.
FAQ - Q1Could an automotive belt tear during use?
FAQ - Q2Will I know immediately if an automotive belt tears?
FAQ - Q3Are there steps I can take to ensure a longer automotive belt life?
FAQ - Q4Is there a way to repair a torn automotive belt?
FAQ - Q5Can I use the same automotive belt for multiple uses?
FAQ - Q6Will a worn automotive belt affect gas mileage?
Good Maintenance Practices - S1 B1Do not use belt dressings to stop belt slippage or noise. These are oil based and may cause belt deterioration.
Good Maintenance Practices - S1 B2Never twist a belt more than 90 degrees during inspection. This may damage the tensile cords and cause premature failure.
Good Maintenance Practices - S1 B3Replace serpentine belts every 60,000 - 100,000 miles. Check vehicle's owner's manual.
Good Maintenance Practices - S1 B4Replace V-belts after 3 to 4 years, or every 36,000 to 48,000 miles.
Good Maintenance Practices - S1 B5Use an approved tension gauge to check belt tension.
Good Maintenance Practices - S1 B6Check for proper belt tension after 500 to 1,000 miles following belt installation. Recheck often, at least twice a year or every 6,000 miles.
Marketing Statement - Product LineBuilt to meet the latest demands, ACDelco's Belts and Hoses line includes automotive belts and hoses, tensioners, pulleys, and kits. ACDelco offers a wide variety of Professional premium, aftermarket parts, and a select offering of GM Original Equipment Belts that fit a variety of vehicles on the road today.
Marketing Statement - Sub BrandWhen it comes to replacing your Belts, ACDelco offers a full line of Professional, premium aftermarket Belt products. To help make part replacement simple and precise, ACDelco also offers pulleys, tensioners, and kits. ACDelco Professional, premium aftermarket belts fit both GM and Non GM vehicles.
Measurements1 3/32 in x 99 5/8 in
Mkt_State_Warranty_CALimited Lifetime Warranty as long as original purchaser still owns vehicle (Parts Only).
Mkt_State_Warranty_USLimited Lifetime as long as original purchaser owns vehicle. (Parts Only)
Signs of Wear & Troubleshooting - S1 B1Rubber Loss: (most common belt wear) a belt wear gauge measures rubber loss, which can result in reduced power transfer from the crank to the accessories.
Signs of Wear & Troubleshooting - S1 B2Glazing: shiny spots can indicate a slipping belt that isn't properly transferring power to accessories.
Signs of Wear & Troubleshooting - S1 B3Pilling: worn rubber can fill in grooves and cause noise, heat, vibration, and excessive wear.
Signs of Wear & Troubleshooting - S1 B4Abrasion: wear along the side could indicate misalignment due to a failed tensioner.
Signs of Wear & Troubleshooting - S1 B5Cracking: older neoprene belts crack as they near the end of their life cycle and often need to be replaced.
Signs of Wear & Troubleshooting - S1 B6Engine stops or backfires.
Signs of Wear & Troubleshooting - S1 B7The belt is producing a squealing noise.
Signs of Wear & Troubleshooting - S1 B8Headlights dim while driving.
Signs of Wear & Troubleshooting - S1 B9Loss of battery charge.



  • 2007-2007 Freightliner FLD132 - Position: Fan and Alternator
  • 1997-1998 Ford Club Wagon
    • W/A.C.
  • 2000-2000 Ford E-450 Econoline Super Duty - Position: Fan, Alternator, Power Steering and Air Conditioning
    • W/A.C.
  • 2012-2012 IC Corporation CE School Bus - Position: Fan, Air Conditioning, Alternator and Water Pump
  • 1997-2000 Ford E-350 Econoline
    • W/A.C.
  • 1999-2001 Ford E-350 Super Duty
    • W/A.C.
  • 2005-2007 Peterbilt 379 - Position: Fan and Alternator
    • W/8-Ribbed Belt
  • 2007-2007 Freightliner FLD120 - Position: Fan and Alternator
  • 2007-2007 Freightliner Classic - Position: Alternator
  • 2004-2004 Sterling Truck LT9500 - Position: Fan and Alternator
  • 2004-2004 Ford F-150 Heritage - Position: Accessory Drive
  • 1997-1997 Ford Expedition
    • W/99" Belt O.C.
  • 2001-2001 Ford Lobo
    • W/A.C.
  • 1999-2001 Ford Econoline
    • W/A.C.
  • 1997-2001 Ford F-150
    • W/A.C.
  • 1997-2001 Ford E-350 Econoline Club Wagon
    • W/A.C.
  • 2007-2007 Freightliner Coronado - Position: Fan and Alternator
  • 2007-2007 Freightliner Century Class - Position: Fan
  • 1997-2001 Ford E-150 Econoline Club Wagon
    • W/A.C.
  • 2011-2011 IC Corporation BE School Bus - Position: Fan
  • 2004-2007 Sterling Truck AT9500 - Position: Fan and Alternator
  • 2002-2003 Ford Lobo - Position: Accessory Drive
  • 1997-2001 Ford E-250 Econoline
    • W/A.C.
  • 2007-2007 Freightliner FLD120SD - Position: Fan and Alternator
  • 1999-1999 Ford E-450 Econoline Super Duty - Position: Fan, Alternator, Power Steering and Air Conditioning
  • 1997-1999 Ford Econoline Super Duty
    • W/A.C.
  • 2002-2003 Ford F-150 - Position: Accessory Drive
  • 2000-2001 Ford E-450 Econoline Super Duty
    • W/A.C.
  • 1999-2001 Ford F-350
    • W/A.C.
  • 2004-2007 International 9400i SBA - Position: Fan and Alternator
  • 2004-2004 Sterling Truck L9500 - Position: Fan and Alternator
  • 1997-2001 Ford F-250
    • W/A.C.
  • 2000-2001 Ford Excursion
    • W/A.C.
  • 1997-2001 Ford E-150 Econoline
    • W/A.C.
  • 2004-2004 Peterbilt 379 - Position: Fan and Alternator
    • W/Clean Air Pkg.
  • 2000-2000 Ford E-450 Econoline Super Duty
  • 2005-2006 Freightliner Classic - Position: Fan and Alternator
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