Rear Tire Suspension Parts for Subaru Forester: A Complete Guide

The rear suspension system of a Subaru Forester plays a critical role in ride comfort, handling, and tire wear. Over time, components wear out and need replacement. Understanding the parts involved helps you make informed decisions whether you’re repairing, upgrading, or maintaining your Forester. This guide covers the essential rear suspension parts, their functions, signs of failure, and practical replacement advice.

Understanding Rear Suspension Components

The rear suspension on a Subaru Forester is typically a multilink independent setup. This design provides a good balance between handling and comfort. Key parts include struts, springs, control arms, sway bars, and bushings. Each component works together to absorb road impacts, maintain tire contact, and keep the vehicle stable.

Rear Struts and Shock Absorbers

Rear struts (often called shock absorbers in some designs) are the primary dampening units. They control the oscillation of the springs and absorb bumps. Subaru Foresters use MacPherson struts or separate shocks depending on the model year. Common signs of worn struts include excessive bouncing, fluid leaks, uneven tire wear, and a bouncy ride. When replacing struts, it’s recommended to do both sides at the same time. Options include OEM replacements, aftermarket brands like KYB or Monroe, and performance upgrades like Bilstein.

Rear Springs

Coil springs support the vehicle’s weight and determine ride height. Sagging springs can cause a lower rear end, poor handling, and bottoming out. Over time, springs can weaken or break. Aftermarket springs are available for OEM ride height or lower/stance. For towing or heavy loads, consider heavy-duty springs. Always replace springs in pairs.

Control Arms and Trailing Arms

Control arms connect the wheel hub to the chassis. The Forester’s rear suspension uses upper and lower control arms, plus trailing arms. These arms control wheel motion and alignment. Worn bushings in control arms cause clunking noises, looseness, and misalignment. Replacement arms often come with new bushings or allow for adjustable alignment. Brands like Moog, TRQ, and Mevotech offer quality options.

Sway Bar and End Links

The rear sway bar reduces body roll during cornering. It connects to the control arms via end links. Worn end links cause rattling or clunking over bumps. Upgraded sway bars improve handling but can increase stiffness. End links are inexpensive and easy to replace.

Bushings and Mounts

Rubber bushings isolate vibration and allow controlled movement. They are used in control arms, strut mounts, and sway bar mounts. Dry rot or cracking indicates need for replacement. Polyurethane bushings offer longer life and firmer feel but can transmit more noise. Proper torque is critical when installing.

Signs That Rear Suspension Parts Need Replacing

• Unusual noises: Clunking, squeaking, or rattling from the rear often points to worn bushings, end links, or struts.
• Poor ride quality: Excessive bouncing, harshness, or floating sensation.
• Uneven tire wear: Cupping or scalloping on rear tires indicates worn dampers or misalignment.
• Vehicle sagging: One side lower than the other or rear end drooping.
• Leaks: Fluid on struts or shocks is a sure sign of failure.
• Alignment issues: Rear camber or toe out of specification usually means worn control arm bushings or bent parts.

Replacement Considerations for Subaru Forester

• Model year matters: Parts vary between generations (e.g., 2009-2013 vs. 2014-2018). Always confirm compatibility using your VIN.
• Replace in pairs: For struts, springs, and control arms, always replace left and right together to maintain balance.
• Alignment after replacement: Any suspension work that affects ride height or geometry requires a professional alignment.
• Torque specs: Use a torque wrench and follow manufacturer specifications. Loose or over-tightened bolts can cause noise or failure.
• Consider complete assemblies: For struts, quick-strut assemblies (spring + strut pre-assembled) simplify the job and often include new mounts and boots.

Upgrading vs. Replacing

If you’re looking for better off-road performance or towing capability, consider upgrading to heavier springs or adjustable control arms. For daily driving, OEM-grade parts offer reliability and comfort. Aftermarket options like KYB Excel-G for struts or Eibach Pro-Kit springs provide a slight improvement without harshness.

Final Recommendation

For most Subaru Forester owners, replacing worn rear suspension parts with quality OE-style components (like KYB or Monroe for struts, and Moog for control arms) is a safe and effective choice. If you frequently carry heavy loads or drive on rough roads, consider upgrading to heavy-duty springs and polyurethane bushings. Always replace worn parts promptly to avoid additional wear on tires and related components. A professional inspection is recommended if you’re unsure about the condition of your Forester’s rear suspension.