HomeBelts and Cooling > Accessory Drive Belt System ComponentsGates 90K-38121A Serpentine Belt Drive Component Kit
Part #: 90K-38121A

Gates 90K-38121A Serpentine Belt Drive Component Kit

Accessory Belt Drive Kit
⚙️ 15 vehicles fit this part
🔍
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$112.52Free Shipping
🚚Free ShippingNo Cost to Continental U.S.
🔄Free Returns*Wrong fit? No cost
🛡️60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
🔥
✅ In Stock · Ready To Ship Most orders ship same-day if ordered before 1pm CST.
OE Direct Replacement — Bolt-on fit, no modifications needed
📦Accessory Belt Drive Kit
🚗Fitment: Ford and Mercury, Mustang, Capri, and LTD
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST

Overview of Gates Accessory Belt Drive Kit 90K-38121A

The Gates Accessory Belt Drive Kit 90K-38121A is designed for reliable serpentine belt system maintenance on select Ford and Mercury vehicles. This kit includes a serpentine belt and tensioner assembly engineered to meet the specific requirements of models like the Ford Mustang, Mercury Capri, and Ford LTD.

  • Includes serpentine belt (Part Number K060910) and tensioner assembly (Part Number 38121)
  • Belt outside circumference: 91.68 inches (2329 mm)
  • Belt top width: 0.807 inches (20 mm)
  • Compatible with Ford Mustang, Mercury Capri, and Ford LTD models
  • Part of the Gates Accessory Belt Drive Kit product line

Detailed Product Description

This serpentine belt drive component kit features a belt with an outside circumference of 91.68 inches (2329 mm) and a top width of 0.807 inches (20 mm), ensuring proper fit and function within the accessory drive system. The included tensioner assembly (Part Number 38121) is designed to maintain optimal belt tension, reducing slippage and wear. The belt itself is identified by Part Number K060910, matching the specifications required for the accessory drive systems in compatible Ford and Mercury vehicles.

The Gates Accessory Belt Drive Kit product line focuses on providing complete solutions for accessory drive belt systems, combining belts and tensioners engineered to work together. This integration helps maintain system reliability and performance, reducing the need for multiple separate parts and simplifying maintenance.

Applications and Common Issues Addressed

  • Replacement of worn or cracked serpentine belts on Ford Mustang, Mercury Capri, and Ford LTD
  • Resolving belt slippage or squealing noises due to tensioner failure
  • Addressing accessory drive system malfunctions caused by improper belt tension
  • Preventing overheating or accessory component failure linked to belt issues
  • Upgrading to a matched belt and tensioner kit for improved system longevity

Installation Notes and Tips

  • Verify vehicle compatibility with Ford Mustang, Mercury Capri, or Ford LTD before installation
  • Ensure proper routing of the serpentine belt according to manufacturer diagrams
  • Use appropriate tools to relieve tension on the old belt tensioner before removal
  • Inspect pulleys and accessory components for wear during installation
  • Confirm correct tensioner assembly part number 38121 is installed with the belt

Quality Assurance and Warranty

Gates manufactures the Accessory Belt Drive Kit 90K-38121A to meet OEM specifications for durability and performance. The components undergo rigorous quality control to ensure reliable operation within the accessory drive system. Warranty coverage details should be confirmed with the product documentation or supplier, as they may vary by region and application.

BrandGates
Part Number90K-38121A
PositionAccessory Belt Drive Kit
Belt 1 Outside Circumference (in)91.68
Belt 1 Outside Circumference (mm)2329
Belt 1 Part NumberK060910
Belt Top Width.807
Belt Top Width20
ContentsBelt, Tensioner
Outside Circumference91.68
Outside Circumference2329
Tensioner Assembly Part Number38121

This part fits 15 vehicles. Search below:

YearMakeModelSubmodelTransmissionLitersCylindersFuel TypePositionNotes
1987FordMustangAutomatic5.0LV8GASN/A{K060910, 38121}; W/A.C.; Accessory Belt Drive Kit
1986FordMustangAutomatic5.0LV8GASN/A{K060910, 38121}; Accessory Belt Drive Kit
1986MercuryCapriAutomatic5.0LV8GASN/A{K060910, 38121}; W/Factory Inst. A.C.; Accessory Belt Drive Kit
1985FordLTDBase5.0LV8GASN/A{K060910, 38121}; W/Factory Inst. A.C.; W/O Fixed Mounting Stud; Accessory Belt Drive Kit
1985FordLTDBrougham5.0LV8GASN/A{K060910, 38121}; W/Factory Inst. A.C.; W/O Fixed Mounting Stud; Accessory Belt Drive Kit
1985FordLTDLX Brougham5.0LV8GASN/A{K060910, 38121}; W/Factory Inst. A.C.; W/O Fixed Mounting Stud; Accessory Belt Drive Kit
1985FordMustang5.0LV8GASN/A{K060910, 38121}; W/Factory Inst. A.C.; W/O Fixed Mounting Stud; Accessory Belt Drive Kit
1985MercuryCapri5.0LV8GASN/A{K060910, 38121}; W/Factory Inst. A.C.; W/O Fixed Mounting Stud; Accessory Belt Drive Kit
1984FordLTDBase5.0LV8GASN/A{K060910, 38121}; W/A.C.; Accessory Belt Drive Kit
1984FordLTDBrougham5.0LV8GASN/A{K060910, 38121}; W/A.C.; Accessory Belt Drive Kit
1984FordMustang5.0LV8GASN/A{K060910, 38121}; W/Factory Inst. A.C.; Accessory Belt Drive Kit
1984MercuryCapri5.0LV8GASN/A{K060910, 38121}; W/Factory Inst. A.C.; W/O Fixed Mounting Stud; Accessory Belt Drive Kit
1983MercuryCapri5.0LV8GASN/A{K060910, 38121}; W/Factory Inst. A.C.; W/O Fixed Mounting Stud; Accessory Belt Drive Kit
1982FordMustang4.2LV8GASN/A{K060910, 38121}; W/A.C.; W/91 5/8" Belt O.C.; Accessory Belt Drive Kit
1982MercuryCapri4.2LV8GASN/A{K060910, 38121}; W/A.C.; W/91 5/8" Belt O.C.; Accessory Belt Drive Kit

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

90K-38121ADBK060910B

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.