Parts of the Rear Suspension on a 2013 Tacoma

The rear suspension of the 2013 Toyota Tacoma is a critical system that affects ride quality, handling, and load capacity. Whether you own a regular cab, access cab, or double cab, the design remains similar, though specific parts can vary between trim levels (e.g., SR5, TRD Sport, TRD Off-Road). This article breaks down every major component of the rear suspension, explains its function, and offers practical advice for maintenance and upgrades.

Leaf Springs

The 2013 Tacoma uses a leaf spring rear suspension. Leaf springs are stacked curved strips of steel that support the vehicle’s weight and absorb road impacts. On the Tacoma, there are typically two leaf spring packs (one per side), each containing multiple leaves. The number of leaves depends on the payload package; heavy-duty variants have extra leaves. Leaf springs connect the axle housing to the frame via spring perches and shackles. They also maintain axle alignment under load.

Common Issues

Leaf springs can sag over time, especially if you frequently carry heavy loads or tow. A sagging leaf spring reduces ride height, makes the truck sit unevenly, and can cause premature tire wear. Inspect leaf springs for cracks, broken leaves, or excessive rust. Replacement is recommended if any leaf is cracked or if the spring has lost its arch.

Upgrade Options

If you lift your Tacoma or carry heavy loads, consider aftermarket leaf springs. Options include add-a-leaf (inserting an extra leaf into the pack) or complete replacement with heavy-duty springs. Brands like OME (Old Man Emu), Deaver, and Icon offer quality leaf springs that improve load capacity and off-road performance. Always match the spring rate to your typical usage.

Shock Absorbers

Shock absorbers (or simply "shocks") dampen the oscillation of the leaf springs. The 2013 Tacoma comes with gas-charged twin-tube shocks from the factory. On the TRD Off-Road package, the rear shocks are Bilstein monotube units, which offer better heat dissipation and off-road damping control. Shocks are mounted between the frame and the axle, usually around the rear wheels.

Signs of Worn Shocks

Worn shocks can cause a bouncy ride, excessive body roll, nose diving under braking, and longer stopping distances. You may also notice fluid leaking from the shock body. A simple bounce test: push down on the rear bumper; if the truck continues bouncing after you let go, shocks need replacement.

Replacement and Upgrades

When replacing shocks, consider upgrading to monotube designs like Bilstein 5100 or 5160 for better on-road and off-road performance. Adjustable shocks (e.g., Fox 2.0) allow tuning for different terrains. If you lift the rear, choose shocks with appropriate extended and compressed lengths.

U-Bolts and Spring Plate

U-bolts secure the leaf spring pack to the axle tube. They wrap around the axle and bolt to a spring plate on top of the leaf pack. The spring plate also provides a mounting point for the shock absorber’s lower eye. U-bolts can stretch or corrode, leading to a loose axle. Always torque u-bolts to spec (typically 85-110 ft-lbs) and retorque after a few miles when replaced.

Bump Stops

Bump stops are rubber blocks mounted on the frame above the axle. They prevent the axle from hitting the frame under extreme compression (e.g., hitting a deep pothole or heavy bottoming). The 2013 Tacoma has rear bump stops, and on some models they are hydraulic (like the TRD Off-Road’s progressive bump stops). Worn or missing bump stops can damage the frame and axle. Inspect for cracking or deformation.

Stabilizer Bar (Sway Bar)

Some 2013 Tacoma trims have a rear stabilizer bar (also called a sway bar or anti-roll bar). This bar connects the left and right sides of the suspension to reduce body lean during cornering. It is attached to the axle via links and bushed end links. Not all Tacomas have a rear sway bar; many base models omit it to reduce cost and improve articulation off-road. If your truck didn’t come with one, aftermarket kits are available (e.g., from Hellwig or ADD). A rear sway bar improves on-road stability, but can limit off-road flex.

Shackles

The leaf spring’s rear end is attached to the frame via a swinging shackle. This shackle allows the spring length to change as it cycles. Shackles have two bolts and bushings. Greaseable shackles are available for easier maintenance. Check shackle bushings for cracking and bolts for proper torque. Aftermarket longer shackles can be used for a mild lift (1-2 inches), but they alter the spring’s angle and can cause pinion misalignment if too long.

Axle Housing and Differential

The axle housing holds the differential and axle shafts. The 2013 Tacoma uses a solid rear axle (SA) in all models. The axle housing is a robust cast-iron piece that supports the vehicle’s weight via the leaf springs. The differential includes the ring and pinion gears, which transfer power to the wheels. Common ratios range from 3.73:1 to 4.30:1 depending on engine and package. Over time, check differential fluid level and condition; low fluid can cause gear whine.

Control Arms? (Clarification)

Tacoma rear suspension does not have control arms like an independent rear suspension. Instead, the leaf springs act as the locating and support mechanism. However, some aftermarket conversions exist, but they are rare. The OEM design relies entirely on leaf springs to control axle radial and torque movements.

Practical Maintenance Tips

• Lubricate Shackles and Spring Eye Bushings: If you use greaseable bushings, grease them at every oil change. Stock rubber bushings should be inspected for wear.
• Torque Check: After any suspension work, re-torque all bolts (leaf springs, shocks, u-bolts) after 50-100 miles.
• Leaf Spring Rust: Use a rust converter or wire brush and paint to prevent scaling. Rust weakens the leaves.
• Shock Replacement Interval: Replace shocks every 50,000-60,000 miles or sooner if signs of wear appear.
• Aftermarket Add-a-Leaf: If you add a leaf to an already sagging pack, consider replacing the entire pack instead to keep spring rate consistent.

Final Recommendation

For most 2013 Tacoma owners, keeping the rear suspension stock is fine if you don’t add heavy aftermarket bumpers or carry extreme loads. If you need to haul gear or tow regularly, look into upgrading leaf springs to a heavy-duty pack (e.g., OME Dakar or Wheeler’s Off-Road). For improved ride comfort on rough roads, replace the factory shocks with Bilstein 5100s. If you off-road, a pair of Fox 2.0 shocks with reservoir will help control heat fade over rough trails. Always replace U-bolts when doing a leaf spring swap, as they stretch over time. Whatever your use, inspect the parts listed above annually to keep your Tacoma’s rear suspension safe and reliable.

Understanding each part of the rear suspension on your 2013 Tacoma helps you make informed decisions for repairs, upgrades, and maintenance. Whether you drive on pavement or trails, a well-maintained rear suspension ensures your truck handles its best.