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Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
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Yukon Gear & Axle
Yukon Gear Muncie M20/M21 4-Speed Transmission Bearing Kit with Synchronizers for Select 1963-1965 GM (ZMBK117WS)
$251.89
This product will be available for sale in 2 weeks, but you can pre-order now to receive 10% discount!
Fits select 1963-1965 Buick, Chevrolet, Oldsmobile, and Pontiac vehicles equipped with Muncie M20 or M21 4-speed manual transmissions.
This comprehensive overhaul kit from Yukon Gear is designed to restore the smooth operation and reliability of your classic Muncie M20 or M21 gearbox. Engineered for the "Model 20" transmission, this kit addresses common wear issues such as bearing whine, shaft play, and gear grind during shifting. By replacing high-wear internal components with precision-matched parts, you can ensure your vintage drivetrain handles torque loads as intended.
- Compatible Transmissions: Muncie M20 and M21 4-Speed Manual
- Components Included: High-quality bearings and a complete set of synchronizer rings (synchros)
- Installation: Designed to meet or exceed OE specifications for precise fitment within the factory casing
- Manufacturer Part Number: ZMBK117WS
Whether you are restoring a Corvette, GTO, or Chevelle, this kit provides the essential internals required for a professional-grade transmission rebuild, ensuring crisp shifts and quiet operation for 1963-1965 GM performance applications.
📘 Guides & Manuals
🔧 Fitment & Compatibility
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1963-1965 | Buick | Electra | Base |
| 1965 | Buick | Gran Sport | Base |
| 1963 | Buick | Invicta | Base |
| 1963-1964 | Buick | LeSabre | Base |
| 1963-1965 | Buick | Skylark | Base |
| 1963-1965 | Buick | Special | Base |
| 1965 | Buick | Sportwagon | Base |
| 1964-1965 | Buick | Wildcat | Base |
| 1963-1965 | Chevrolet | Bel Air | Base |
| 1963-1965 | Chevrolet | Biscayne | Base |
| 1964-1965 | Chevrolet | Chevelle | 300 |
| 1963-1965 | Chevrolet | Chevy II | Base |
| 1963-1965 | Chevrolet | Corvette | Base |
| 1963-1965 | Chevrolet | Impala | Base |
| 1965 | Oldsmobile | 442 | Base |
| 1964-1965 | Oldsmobile | 98 | Base |
| 1964-1965 | Oldsmobile | Cutlass | Base |
| 1964 | Oldsmobile | Dynamic 88 | Base |
| 1963-1965 | Oldsmobile | F85 | Base |
| 1963 | Oldsmobile | Jetfire | Base |
| 1964-1965 | Oldsmobile | Jetstar 88 | Base |
| 1964-1965 | Oldsmobile | Jetstar I | Base |
| 1964 | Oldsmobile | Starfire | Base |
| 1964 | Oldsmobile | Super 88 | Base |
| 1964-1965 | Oldsmobile | Vista Cruiser | Base |
| 1963-1965 | Pontiac | Bonneville | Base |
| 1963-1965 | Pontiac | Bonneville | Safari |
| 1963-1965 | Pontiac | Catalina | Base |
| 1963-1965 | Pontiac | Grand Prix | Base |
| 1964-1965 | Pontiac | GTO | Base |
| 1964-1965 | Pontiac | LeMans | Base |
| 1963-1965 | Pontiac | Star Chief | Base |
| 1963-1965 | Pontiac | Tempest | Base |
| 1963-1965 | Pontiac | Tempest | Safari |
Choose your Location
-
Atlus
1340 Cobb Dr, Unit 1, Eustis, FL 32736
352-234-4458
Mon – Fri: 8:30 am – 4:30 pm
Sat: 9:00 am – 2:00 pm
Sun: Closed
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Yukon Gear Muncie M20/M21 4-Speed Transmission Bearing Kit with Synchronizers for Select 1963-1965 GM (ZMBK117WS)
$251.89
This product will be available soon, but you can pre-order now to get on the list before others!
US Based Support - In Florida
30 Days Satisfaction Guarantee
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$251.89
$251.89
$251.89
Fits select 1963-1965 Buick, Chevrolet, Oldsmobile, and Pontiac vehicles equipped with Muncie M20 or M21 4-speed manual transmissions.
This comprehensive overhaul kit from Yukon Gear is designed to restore the smooth operation and reliability of your classic Muncie M20 or M21 gearbox. Engineered for the "Model 20" transmission, this kit addresses common wear issues such as bearing whine, shaft play, and gear grind during shifting. By replacing high-wear internal components with precision-matched parts, you can ensure your vintage drivetrain handles torque loads as intended.
- Compatible Transmissions: Muncie M20 and M21 4-Speed Manual
- Components Included: High-quality bearings and a complete set of synchronizer rings (synchros)
- Installation: Designed to meet or exceed OE specifications for precise fitment within the factory casing
- Manufacturer Part Number: ZMBK117WS
Whether you are restoring a Corvette, GTO, or Chevelle, this kit provides the essential internals required for a professional-grade transmission rebuild, ensuring crisp shifts and quiet operation for 1963-1965 GM performance applications.
📘 Guides & Manuals
🔧 Fitment & Compatibility
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1963-1965 | Buick | Electra | Base |
| 1965 | Buick | Gran Sport | Base |
| 1963 | Buick | Invicta | Base |
| 1963-1964 | Buick | LeSabre | Base |
| 1963-1965 | Buick | Skylark | Base |
| 1963-1965 | Buick | Special | Base |
| 1965 | Buick | Sportwagon | Base |
| 1964-1965 | Buick | Wildcat | Base |
| 1963-1965 | Chevrolet | Bel Air | Base |
| 1963-1965 | Chevrolet | Biscayne | Base |
| 1964-1965 | Chevrolet | Chevelle | 300 |
| 1963-1965 | Chevrolet | Chevy II | Base |
| 1963-1965 | Chevrolet | Corvette | Base |
| 1963-1965 | Chevrolet | Impala | Base |
| 1965 | Oldsmobile | 442 | Base |
| 1964-1965 | Oldsmobile | 98 | Base |
| 1964-1965 | Oldsmobile | Cutlass | Base |
| 1964 | Oldsmobile | Dynamic 88 | Base |
| 1963-1965 | Oldsmobile | F85 | Base |
| 1963 | Oldsmobile | Jetfire | Base |
| 1964-1965 | Oldsmobile | Jetstar 88 | Base |
| 1964-1965 | Oldsmobile | Jetstar I | Base |
| 1964 | Oldsmobile | Starfire | Base |
| 1964 | Oldsmobile | Super 88 | Base |
| 1964-1965 | Oldsmobile | Vista Cruiser | Base |
| 1963-1965 | Pontiac | Bonneville | Base |
| 1963-1965 | Pontiac | Bonneville | Safari |
| 1963-1965 | Pontiac | Catalina | Base |
| 1963-1965 | Pontiac | Grand Prix | Base |
| 1964-1965 | Pontiac | GTO | Base |
| 1964-1965 | Pontiac | LeMans | Base |
| 1963-1965 | Pontiac | Star Chief | Base |
| 1963-1965 | Pontiac | Tempest | Base |
| 1963-1965 | Pontiac | Tempest | Safari |
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