Yukon Chrysler 9.25" ZF Ring & Pinion Gear Set – 2011+, 3.21 Ratio
YUKYG C9.25B-321B
Upgrade your drivetrain with the Yukon Ring & Pinion Gear Set for 2011-Up Chrysler 9.25" ZF differentials in a 3.21 ratio. Yukon produces ring and pinion sets engineered to meet exacting structural and surface finish standards and the result is smooth engagement, reduced friction, lower operating temperatures, and quiet operation.
The 3.21 ratio is a strong choice for highway-focused applications, factory replacement needs, and builds seeking lower cruising RPM with balanced everyday drivability.
Includes:
- Ring gear for 2011-Up Chrysler 9.25" ZF differentials
- Matching pinion gear
- Installation kit, bearings, shims, and carrier components sold separately unless noted.
- Sold as a matched gear set
Specifications
- Brand: Yukon Gear & Axle
- Part Number: YG C9.25B-321B
- Product Type: Ring & pinion gear set
- Application: Chrysler 9.25" ZF differential
- Model Years: 2011 and newer
- Gear Ratio: 3.21
- Spline Count: 29
- Construction: Heat-treated high-strength gear steel
- Quantity: Sold as a matched set
Fitment
- Fits 2011-up Chrysler 9.25" ZF axle assemblies
- Verify axle tag, differential model, and OEM ratio before ordering.
| Make | Model | Year Range |
|---|---|---|
| Ram | 1500 | 2011–2019 |
Tech Insight
The 3.21 ratio is often selected for highway efficiency and lower engine RPM at cruising speeds. It can also be an excellent factory replacement ratio when restoring drivability after differential damage.
Modern axle platforms such as the Chrysler 9.25 ZF require precise setup procedures. Proper backlash, pinion preload, and tooth pattern are essential for quiet operation and long gear life.