2000 WJ Cherokee Suspension Parts Interchange for 99 XJ Cherokee: What Fits and What Doesn't

If you own a 1999 Jeep Cherokee (XJ) and are considering using suspension parts from a 2000 Jeep Grand Cherokee (WJ), you're likely looking for affordable upgrades or replacements. While both are Jeep vehicles from the same era, their suspensions are not identical. This guide explains what interchanges, what requires modification, and what should be avoided.

Understanding the WJ and XJ Suspension Differences

The 2000 Jeep Grand Cherokee (WJ) has a completely different front suspension design compared to the XJ. The WJ uses a short-long arm (SLA) independent front suspension, while the XJ has a solid front axle with leaf springs in the rear. The XJ uses a classic solid axle setup (Dana 30 front, Chrysler 8.25 or Dana 35 rear), while the WJ has independent front suspension and a solid rear axle (Dana 44A or 35).

Front Suspension Components

• Control Arms: XJ uses upper and lower control arms for the solid axle. WJ has upper and lower control arms that connect to the knuckle. They are not interchangeable.
• Track Bar: Both have a track bar, but the WJ track bar is longer and mounts differently. XJ track bars can be used with modifications, but it's not direct.
• Coil Springs: XJ front coils are different diameter and rate. WJ springs may be used if you swap the entire coil bucket or use adapters, but it's not recommended.
• Shocks: WJ shocks are longer in travel. They can be used on an XJ if you have a lift, but valving may be off.
• Sway Bar: Different lengths and link designs. Not direct swap.

Rear Suspension Components

• Leaf Springs: XJ uses leaf springs; WJ uses coil springs with control arms. No interchange.
• Shocks: Rear shocks may be similar length but bushings differ. Some aftermarket shocks fit both, but direct OEM swap is rare.
• Track Bar: Most WJs have a rear track bar; XJs do not. Not relevant.

What Interchanges and What Doesn't

Parts That Can Be Made to Fit with Modifications

• Front Coil Springs: If you have a serious lift (4"+), WJ springs can be used if you cut them or use spring spacers. But spring rate is different; XJ is lighter.
• Front Shocks: WJ shocks are often longer, so they can work for lifted XJs. Measure compressed and extended lengths carefully.
• Rear Shocks: Some WJ rear shocks have similar extended length to XJ aftermarket shocks. But bushings may need to be swapped.
• Steering Components: The drag link and tie rod ends are different. No interchange.
• Brakes: WJ brakes are larger (dual piston calipers) and can be swapped onto XJ if using adapters and the correct knuckles. Not a direct bolt-on.

Parts That Are Not Interchangeable

• Control Arms: Completely different geometry.
• Track Bar: Different lengths and mounting locations.
• Leaf Springs: XJ uses leaf; WJ uses coil.
• Sway Bars: Different mounting.
• Knuckles/Spindles: WJ knuckles are for independent suspension; XJ knuckles for solid axle.

Step-by-Step Interchange Considerations

Bolting On vs. Modification

• Simple Bolts: Rarely any WJ suspension part directly bolts onto an XJ without adapters or fabrication.
• Common Adapters: For brakes, you can use WJ dual-piston calipers with bracket adapters available from aftermarket suppliers. For springs, you can use coil spring spacers but it's adding lift, not a direct swap.
• Need for Welding: Most modifications require welding new brackets or cutting old ones. Not a weekend job for beginners.

Brakes and Steering

• Brake Swap: Swapping WJ front brakes (knuckles, calipers, rotors) onto an XJ is a popular upgrade but requires XJ ball joints and some fabrication. It improves braking but is not a suspension part.
• Steering: WJ steering gearbox can be swapped but requires modifications to the frame and steering shaft. Not for the faint of heart.

Practical Tips for a Successful Swap

1. Identify Your Goal: Are you looking for a budget lift? Better on-road handling? Off-road durability? If you just need replacement parts, buy XJ-specific parts. If you want to upgrade, aftermarket XJ lift kits are simpler.
2. Check Compatibility: If you insist on using WJ parts, look for forums and build threads from others who have done it. Many XJ owners have used WJ front brake and steering box swaps.
3. Expect Custom Work: You will likely need to weld, grind, or drill. Have the right tools.
4. Consider Safety: Suspension modifications affect alignment, brake balance, and handling. Get a professional alignment after.

Final Recommendation

For most XJ owners, it is not worth the hassle to interchange suspension parts from a 2000 WJ. The designs are too different. Unless you are specifically looking for certain upgraded components (like WJ brakes or steering box) and are prepared for fabrication, stick with XJ-specific or aftermarket parts. If you are on a tight budget, junkyard XJ parts are a better match. The WJ suspension interchange is possible but only for advanced DIYers who enjoy custom fabrication.