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Yukon Gear YK GM12P Master Overhaul Kit for GM 12-Bolt Passenger Car Differential
The YK GM12P is a complete rebuild kit engineered for the General Motors 12-bolt passenger car rear differential, the legendary axle found beneath classic Chevelle, Camaro, El Camino, Nova, and other GM A-body and F-body muscle cars from the 1960s and early 1970s. When your vintage GM muscle car needs a differential overhaul, the YK GM12P provides Timken bearings, precision shims, seals, and all fasteners in one convenient package. Yukon Gear built the YK GM12P complete rebuild kit to meet the demands of restorers and performance builders who need every component to be right the first time.
Features and Benefits
- Premium Timken carrier bearings and pinion bearings for the GM 12-bolt passenger car application
- Precision ground shim sets for accurate pinion depth and carrier preload adjustment
- High-quality pinion seal and axle seals to prevent gear oil leaks
- Ring gear bolts, pinion nut, and crush sleeve included for a complete hardware refresh
- Gear marking compound and brush for verifying ring-and-pinion contact pattern during setup
- Thread-locking compound for ring gear bolt installation
- Differential cover gasket included for a clean, leak-free reinstall
- Specific to the GM 12-bolt passenger car axle (not interchangeable with the 12-bolt truck kit)
- All components packaged and quality-controlled by Yukon Gear
Fitment
| Year | Make | Model | Notes |
|---|---|---|---|
| 1965 | Chevrolet | Chevelle | GM 12-bolt passenger car rear axle |
| 1966 | Chevrolet | Chevelle | GM 12-bolt passenger car rear axle |
| 1967 | Chevrolet | Chevelle | GM 12-bolt passenger car rear axle |
| 1968 | Chevrolet | Chevelle | GM 12-bolt passenger car rear axle |
| 1969 | Chevrolet | Chevelle | GM 12-bolt passenger car rear axle |
| 1970 | Chevrolet | Chevelle | GM 12-bolt passenger car rear axle |
| 1971 | Chevrolet | Chevelle | GM 12-bolt passenger car rear axle |
| 1972 | Chevrolet | Chevelle | GM 12-bolt passenger car rear axle |
| 1965 | Chevrolet | El Camino | GM 12-bolt passenger car rear axle |
| 1966 | Chevrolet | El Camino | GM 12-bolt passenger car rear axle |
| 1967 | Chevrolet | El Camino | GM 12-bolt passenger car rear axle |
| 1968 | Chevrolet | El Camino | GM 12-bolt passenger car rear axle |
| 1969 | Chevrolet | El Camino | GM 12-bolt passenger car rear axle |
| 1970 | Chevrolet | El Camino | GM 12-bolt passenger car rear axle |
| 1971 | Chevrolet | El Camino | GM 12-bolt passenger car rear axle |
| 1972 | Chevrolet | El Camino | GM 12-bolt passenger car rear axle |
| 1967 | Chevrolet | Camaro | GM 12-bolt passenger car rear axle |
| 1968 | Chevrolet | Camaro | GM 12-bolt passenger car rear axle |
| 1969 | Chevrolet | Camaro | GM 12-bolt passenger car rear axle |
| 1970 | Chevrolet | Camaro | GM 12-bolt passenger car rear axle |
| 1971 | Chevrolet | Camaro | GM 12-bolt passenger car rear axle |
| 1972 | Chevrolet | Camaro | GM 12-bolt passenger car rear axle |
| 1966 | Chevrolet | Nova | GM 12-bolt passenger car rear axle |
| 1967 | Chevrolet | Nova | GM 12-bolt passenger car rear axle |
| 1968 | Chevrolet | Nova | GM 12-bolt passenger car rear axle |
| 1969 | Chevrolet | Nova | GM 12-bolt passenger car rear axle |
| 1970 | Chevrolet | Nova | GM 12-bolt passenger car rear axle |
| 1971 | Chevrolet | Nova | GM 12-bolt passenger car rear axle |
| 1972 | Chevrolet | Nova | GM 12-bolt passenger car rear axle |
| 1965 | Chevrolet | Impala | GM 12-bolt passenger car rear axle |
| 1966 | Chevrolet | Impala | GM 12-bolt passenger car rear axle |
| 1967 | Chevrolet | Impala | GM 12-bolt passenger car rear axle |
| 1968 | Chevrolet | Impala | GM 12-bolt passenger car rear axle |
| 1969 | Chevrolet | Impala | GM 12-bolt passenger car rear axle |
| 1970 | Chevrolet | Impala | GM 12-bolt passenger car rear axle |
| 1971 | Chevrolet | Impala | GM 12-bolt passenger car rear axle |
| 1972 | Chevrolet | Impala | GM 12-bolt passenger car rear axle |
Specifications
| Specification | Detail |
|---|---|
| Part Number | YK GM12P |
| UPC | 883584140794 |
| Differential | GM 12-Bolt Passenger Car |
| Ring Gear Size | 8.875 inches |
| Bearings Included | Timken carrier bearings and pinion bearings with races |
| Seals Included | Pinion seal, axle seals |
| Shim Set | Complete pinion depth and carrier shim set |
| Warranty | Yukon Gear limited warranty |
What's Included
- Timken carrier bearings with races (2 sets)
- Timken pinion bearings with races (front and rear)
- Pinion seal
- Axle seals (pair)
- Complete pinion depth shim set
- Complete carrier shim set
- Ring gear bolts
- Pinion nut
- Crush sleeve
- Thread-locking compound
- Gear marking compound with brush
- Differential cover gasket
Frequently Asked Questions
Q: What is the difference between the YK GM12P and YK GM12T?
A: The YK GM12P is calibrated for the GM 12-bolt passenger car rear differential used in Chevelle, Camaro, Nova, and related vehicles. The YK GM12T is for the GM 12-bolt truck axle found in C/K pickups and Suburban. These two differentials share the bolt count but have different dimensions and components.
Q: Does this kit fit a 1969 Chevrolet Camaro with a 12-bolt rear axle?
A: Yes. The YK GM12P complete rebuild kit is designed for the GM 12-bolt passenger car differential as used in the 1967 to 1972 Camaro and similar A-body and F-body platforms.
Q: Are Timken bearings included?
A: Yes. The YK GM12P includes genuine Timken carrier bearings and pinion bearings with races for both positions.
Q: Will installing this kit void my vehicle warranty?
A: Under the Magnuson-Moss Warranty Act, a manufacturer cannot void your warranty solely because you installed an aftermarket part. Warranty coverage can be denied only if the aftermarket part directly caused the failure.
Q: Does this kit include a crush sleeve and pinion nut?
A: Yes. The YK GM12P includes a new crush sleeve, pinion nut, and ring gear bolts for a complete hardware refresh.
Q: Is gear marking compound included?
A: Yes. The YK GM12P includes gear marking compound and a brush for verifying ring-and-pinion contact pattern during setup.
Q: Do I need any special tools to install this kit?
A: Yes. A bearing press, dial indicator, inch-pound torque wrench, and depth micrometer are required for proper pinion depth and preload setup.
Q: Is a differential cover gasket included?
A: Yes. A differential cover gasket is included in the YK GM12P complete rebuild kit for a clean, leak-free reinstall.
Installation Instructions
- Drain the differential gear oil and remove the rear axle shafts per your service manual.
- Remove the differential cover and thoroughly clean both mating surfaces.
- Remove the carrier assembly and inspect the housing bore for wear or damage.
- Extract the pinion shaft and note the original shim stack thickness for reference.
- Press off the old pinion bearings and install the new Timken pinion bearings from the YK GM12P kit.
- Use the included shim set to establish correct pinion depth; verify with a dial indicator.
- Press new carrier bearings and races onto the carrier assembly.
- Install the carrier, set backlash to GM specification, and verify contact pattern using the included marking compound.
- Apply included thread-locking compound to ring gear bolts and torque to specification.
- Install the new pinion seal and torque the pinion nut to achieve correct pinion bearing preload.
- Install new axle seals, reinstall axle shafts, and torque all fasteners to specification.
- Install the cover with the new gasket and fill with the appropriate gear oil type and quantity.
- Road test the vehicle and inspect for leaks after the initial break-in period.
California Proposition 65 Warning: This product can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer, birth defects, and other reproductive harm. For more information, visit www.p65warnings.ca.gov.
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