American Axle (AAM) 26066706 – Rear Ring & Pinion Gear Set
GM 8.5" / 8.6" 10-Bolt • 3.73 Ratio • 30-Spline Pinion • 41/11 Teeth
American Axle & Manufacturing (AAM) Ring & Pinion Set for the popular GM 8.5" / 8.6" (8.6") 10-bolt rear differential. This gear set is designed to restore proper gearing after wear or damage, or to change your axle ratio for improved performance and drivability.
- Gear Ratio: 3.73
- Ring Gear Diameter: 8.5" / 8.6" (GM 10-bolt)
- Pinion Splines: 30
- Tooth Count: 41 Ring / 11 Pinion
- Cover Bolt Quantity: 10
- Application Type: Car / Truck
Condition
- New gear set
- Exactly as pictured / described
- Please note: installation kit is NOT included unless explicitly stated in the listing (bearings, shims, crush sleeve, seals, gear oil, etc.)
Fitment & Application
Fits many 1972–2013 GM 8.5" & 8.6" Chevy 10-bolt rear ends. Fitment varies by axle code/RPO, ring gear size, spline count, and ratio. Please confirm compatibility before purchase.
Important Buyer Notice: Ring & pinion setup requires special tools and experience. Improper installation can cause noise and premature failure. Professional installation is strongly recommended.
OEM / Interchange Numbers
AAM Part Number: 26066706
OEM / Interchange: 12471280, 12479315, 1259441, 26029128, 26029438, 26030655, 26031115, 26035826, 26037712, 26038866, 26041513, 40001001, 40127813
Aftermarket Reference Numbers
- Motive Gear: GM10A, GM1, G885
- Richmond: GM85, 4900171
Common Vehicle Applications (Guide Only)
This gear set is used across many GM platforms. Below is a general application guide (not guaranteed). Please verify your axle (8.5"/8.6" 10-bolt) and ratio requirements before ordering.
| Make | Model | Years |
|---|---|---|
| Buick | Electra | 1984 |
| Buick | Rainier | 2007 |
| Cadillac | Brougham | 1987–1992 |
| Cadillac | Escalade | 1999–2014 |
| Chevrolet | Avalanche / Avalanche 1500 | 2002–2007 |
| Chevrolet | Blazer / K5 Blazer | 1985–1994 |
| Chevrolet | C/K 10 / 1500 Pickups & Suburban | 1985–1999 |
| Chevrolet | Express 1500 | 1997–2014 |
| Chevrolet | G10 / G20 Vans | 1982–1995 |
| Chevrolet | Silverado 1500 | 2000–2013 |
| Chevrolet | SSR | 2003–2006 |
| Chevrolet | Suburban 1500 | 2000–2014 |
| Chevrolet | Tahoe | 1995–2014 |
| Chevrolet | TrailBlazer | 2002–2009 |
| GMC | C/K 1500 Pickups & Suburban | 1985–1999 |
| GMC | Envoy | 2004–2009 |
| GMC | G1500 / G2500 Vans | 1983–1995 |
| GMC | Jimmy | 1986–1990 |
| GMC | K1500 Pickups & Suburban | 1985–1999 |
| GMC | Savana 1500 | 1996–2012 |
| GMC | Sierra 1500 / Sierra 1500 Classic | 2000–2013 |
| GMC | Yukon / Yukon XL 1500 | 1994–2014 |
| Isuzu | Ascender | 2003–2008 |
| Saab | 9-7X | 2007–2009 |
Helpful Tips Before You Buy
- Confirm your rear end is a GM 8.5" / 8.6" 10-bolt (not 8.25", 9.5", 10.5", etc.)
- Match the pinion spline count (30) and desired ratio (3.73)
- If changing ratio, your speedometer/PCM may require recalibration (vehicle dependent)