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Rebuild Your Positraction With Factory-Grade Bite
When your GM or Ford positraction unit starts slipping through corners or chirping on tight turns, worn clutch plates are usually the culprit. The Yukon Gear YPKGM12-PC-DG1 14 plate Dura Grip composite clutch kit restores the aggressive, consistent lockup your differential had when it left the factory, giving both wheels the traction they need under power.
Key Features
- 14 piece Dura Grip composite clutch kit engineered specifically for GM and Ford Dura Grip positraction units
- Composite clutch material designed for smooth, predictable engagement on street-driven vehicles
- Direct fit replacement for worn or glazed factory clutch packs
- Restores consistent side-to-side traction for improved launch and cornering grip
- Manufactured by Yukon Gear and Axle to OEM-or-better tolerances
Fitment
| Year Range | Make | Model |
|---|---|---|
| 1963-1979 | Chevrolet | Corvette |
The YPKGM12-PC-DG1 clutch kit also fits GM 12 bolt passenger car and truck differentials, GM 8.2 inch, 8.5 inch, and 8.6 inch axles, and Ford 8.8 inch differentials equipped with a Dura Grip positraction unit. Does not fit factory limited slip units.
Specifications
| Detail | Value |
|---|---|
| Manufacturer Part Number | YPKGM12-PC-DG1 |
| UPC | 883584160649 |
| Brand | Yukon Gear and Axle |
| Kit Configuration | 14 plate composite clutch pack |
| Compatible Differentials | GM 8.2in, 8.5in, 8.6in, 12 bolt, Ford 8.8in Dura Grip |
| Shipping Weight | 2.2 lb |
What's Included
- 14 Dura Grip composite clutch plates
- Two side gears
- Two pinion gears
- Cross pin shaft and roll pin
- Spider gear thrust washers
About Yukon Gear and Axle
Yukon Gear and Axle has spent decades building drivetrain components for street, off-road, and racing applications. Their Dura Grip lineup focuses on rebuilding OEM positraction units with clutch materials that outlast the factory originals while keeping engagement smooth for daily driving.
Frequently Asked Questions
What is the YPKGM12-PC-DG1?The YPKGM12-PC-DG1 is a 14 plate Dura Grip composite clutch kit from Yukon Gear and Axle used to rebuild GM and Ford positraction differentials that have started slipping or making noise under load.
Do I need to replace both sides of my differential?Yes, the full 14 plate kit replaces the complete clutch pack across both sides so engagement stays balanced left to right.
Will this fit a factory limited slip differential?No, this kit is designed specifically for Dura Grip positraction units and does not fit factory limited slip carriers.
Does installing this require removing the differential carrier?Yes, the carrier needs to come out of the housing to access and replace the clutch pack, so most installers treat this as a full differential service.
Do I need new gear oil after installing this kit?Yes, fresh gear oil with the correct friction modifier is recommended any time the clutch pack is serviced to ensure proper break-in.
Is there a break-in period after installation?Yes, composite clutches typically need a short break-in period of light driving before full engagement feels consistent.
What tools are needed to install this kit?Basic hand tools plus a way to measure clutch pack preload are recommended, along with a shop press if the carrier bearings need to be removed.
Does this come with installation instructions?Yes, general installation guidance is included below, though we recommend a shop manual specific to your differential for exact preload specs.
What is the warranty on this clutch kit?Yukon Gear and Axle backs the YPKGM12-PC-DG1 against manufacturing defects; contact us for full warranty terms on your specific application.
Is the YPKGM12-PC-DG1 a direct fit or does it need modification?It is a direct fit replacement clutch pack for factory Dura Grip units, so no cutting or modification is required for install.
Install Instructions
- Drain the differential fluid and remove the differential cover
- Remove the carrier from the housing following your service manual
- Disassemble the positraction unit and remove the worn clutch plates
- Install the new Dura Grip composite clutches, side gears, pinion gears, and cross pin per the kit layout
- Measure and shim clutch pack preload to manufacturer specification
- Reinstall the carrier, set backlash and pinion depth, then reinstall the cover
- Refill with the correct gear oil and friction modifier before road testing
Prop 65 Warning
WARNING: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.
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