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Build Your Ideal YJ Lift With Skyjacker's Component System
The Skyjacker YJ21BB is a 2.5 inch suspension lift kit component box designed for 1987-1995 Jeep Wrangler YJ owners who want to build a lift system to their exact specifications. Rather than a fixed, one size fits all kit, the YJ21BB component approach lets you pair the correct blocks, U-bolts, and hardware with the shocks and springs that match your intended use, whether that is daily driving, trail work, or a mix of both. Skyjacker manufactures the YJ21BB using ductile iron blocks that are tapered to correct pinion angle and reduce driveline vibration after lifting. This 2.5 inch lift height provides clearance for larger tires while keeping the YJ's stance balanced and stable on and off the trail.
Key Features
- 2.5 inch lift height for improved ground clearance
- Ductile iron blocks tapered to correct pinion angle
- Component box design for building a custom lift system
- Compatible with up to 31x10.5 inch tires
- Fits 15x8 inch wheels with 3.75 inch backspacing
- All mounting hardware included
Fitment Table
| Year Range | Make | Model |
|---|---|---|
| 1987-1995 | Jeep | Wrangler |
Specifications
| Detail | Value |
|---|---|
| MPN | YJ21BB |
| UPC | Not Published |
| Part Type | Suspension Lift Kit Component |
| Lift Height | 2.5 inches |
| Maximum Tire Size | 31 x 10.5 inches |
| Maximum Wheel Size | 15 x 8 inches |
| Recommended Backspacing | 3.75 inches |
| Prop 65 | Yes |
What's Included
- Front and rear lift blocks
- U-bolt kits
- Mounting hardware
About Skyjacker
Skyjacker has manufactured suspension lift kits, shocks, and related components in Louisiana since 1970. The company is known for durable, American made suspension parts designed to hold up to demanding on road and off road use while maintaining factory like ride quality.
Related Parts
- Skyjacker Suspension Lift Kit Component 1988-1988 Chevrolet V10 Suburban
FAQ
What is the YJ21BB?The YJ21BB is a Skyjacker 2.5 inch suspension lift kit component box for 1987-1995 Jeep Wrangler YJ models. It provides the blocks and hardware needed to build a 2.5 inch lift system.
Does the YJ21BB include shocks?No, the YJ21BB is a component box. Shocks are selected separately to match your intended use and budget.
What tire size can I run with the YJ21BB?The YJ21BB supports up to a 31x10.5 inch tire with a 15x8 inch wheel and 3.75 inch backspacing.
Why does the YJ21BB use tapered blocks?The tapered ductile iron blocks correct pinion angle after lifting, which helps reduce driveline vibration.
Do I need additional parts to complete a lift with the YJ21BB?Yes, most builders pair the YJ21BB component box with springs, shocks, and any needed track bar or sway bar components for a complete system.
Is the YJ21BB suitable for daily driving?Yes, at 2.5 inches of lift the YJ21BB is a popular choice for a balance of trail capability and comfortable street manners.
Does the YJ21BB fit both 4 and 6 cylinder YJ models?The YJ21BB is designed to fit YJ Wrangler chassis broadly. Confirm your specific engine and drivetrain configuration when ordering.
Does the YJ21BB include installation instructions?Yes, printed installation instructions are included with the component box.
Install Instructions
- Raise the vehicle and support it securely on jack stands, then remove the wheels.
- Support the front and rear axles with a floor jack and disconnect the shocks, sway bar links, and track bar as applicable.
- Remove the factory U-bolts and lift blocks or spring plates at each axle location.
- Install the new Skyjacker lift blocks in the correct orientation, aligning the tapered surface with the pinion angle.
- Install the new U-bolts and torque to manufacturer specification.
- Reconnect the shocks, sway bar links, and track bar using new or extended components as required.
- Lower the vehicle, check ride height, and re-torque all hardware after driving a short distance.
Prop 65 Warning
WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.p65warnings.ca.gov.
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