The Ultimate Guide to 1990 300TE Rear Suspension Parts on RockAuto

Maintaining the rear suspension on a 1990 Mercedes-Benz 300TE (W124 wagon) is key to preserving its legendary ride quality and handling. RockAuto offers a wide selection of OEM and aftermarket parts at competitive prices. This guide covers everything you need to know to choose and install the correct rear suspension components for your 300TE.

Understanding the 1990 300TE Rear Suspension System

The 300TE uses a multi-link independent rear suspension. It consists of control arms, trailing arms, subframe bushings, coil springs, shock absorbers, and sway bar links. The wagon version often has a self-leveling system (SLS) with hydraulic struts (Nivomat or similar). Not all 300TEs have SLS; some have conventional shocks and springs. Check your VIN or look for hydraulic lines near the rear shocks. Knowing which system you have is critical before ordering parts.

Key Components to Replace

• Shock Absorbers / Struts: For conventional setups, Sachs is OEM. For SLS, the hydraulic struts are specific to the system. RockAuto lists both types. Look for Sachs, Bilstein, or Monroe.
• Coil Springs: Springs sag over time. Replace in pairs. Eibach offers progressive-rate springs for better handling. Stock replacements are available from Moog or Febi Bilstein.
• Control Arms and Trailing Arms: Bushings wear out. Lemförder and Febi Bilstein make high-quality arms with new bushings. RockAuto often sells complete arms at a reasonable price.
• Bushings: If the arms are still good, you can press in new bushings. Polyurethane bushings (Powerflex, Energy Suspension) stiffen the ride but reduce body roll. Rubber OE-style from Lemförder is quieter.
• Sway Bar Links: Linkages can clunk over bumps. Replace with Moog or Lemförder. Check the sway bar bushings too.
• Subframe Mounts: The rear subframe has large rubber mounts that deteriorate. RockAuto carries original-equivalent mounts from Febi.

Aftermarket vs OEM: Which to Choose on RockAuto

RockAuto stock both. OEM brand names include Lemförder, Febi Bilstein, Sachs, and ZF. Aftermarket brands like Monroe, KYB, and Duralast are cheaper but may not last as long. For critical parts like SLS struts or control arms, choose OEM to ensure proper geometry. For shocks and sway bar links, good aftermarket options work well. Read the part description carefully: many aftermarket parts are made by the same manufacturers that supply OEM (e.g., Sachs makes OEM shocks).

OEM Parts (Lemförder, Febi Bilstein)

These match the original design exactly. Lemförder control arms often come with ball joints and bushings pre-installed. Febi Bilstein springs have the correct rate for the wagon's heavy rear load. Prices are higher, but reliability is proven.

Budget-Friendly Alternatives

Monroe Sensa-Trac shocks are a good upgrade for non-SLS cars. KYB Excel-G gas shocks improve ride control. For bushings, Moog offers greasable versions that extend life. Avoid bottom-dollar parts; they compromise safety and cause premature wear.

Step-by-Step: How to Find the Right Parts on RockAuto

RockAuto's catalog is vast. Follow these steps to avoid mistakes.

Using Vehicle Filters

Enter your vehicle: 1990 Mercedes-Benz 300TE. Select the correct engine (3.0L L6). The "Rear Suspension" category lists all components. Use the dropdowns to narrow by part type. Filter by brand if desired.

Part Numbers and Cross-References

Cross-reference with your Mercedes part number (starts with 124). RockAuto often provides OEM numbers in the description. For example, the rear sway bar link OEM part number is 124 326 00 80. Search that directly. You can also use RockAuto's "Part Number Search" box. If unsure, compare photos and measurements.

SLS vs Non-SLS

This is the most common mistake. If your wagon has the self-leveling system, choose "Strut, Rear, with Load Leveling" or similar. Non-SLS cars use "Shock Absorber." RockAuto lists them separately. Check your car: look under the rear; if you see a thick shock with a rubber boot and hydraulic lines, it's SLS.

Common Issues and Replacement Recommendations

• Sagging Rear: Springs weaken. Replace both coils. Pro tip: If you carry heavy loads, consider heavy-duty springs (Moog CC873 is a popular choice).
• Clunking from Rear: Usually worn sway bar links or control arm bushings. Inspect while on a lift. Replace links first as they are cheapest.
• Bouncy Ride: Shocks are worn. Replace in pairs. For SLS, the struts are expensive; consider converting to a conventional shock set (kits available from some aftermarket suppliers).
• Alignment Issues: Worn subframe mounts can cause misalignment. Replace both mounts and re-align. RockAuto's Febi subframe mounts include the bolts.

Self-Leveling System (SLS) Notes

The SLS uses a hydraulic pump and struts filled with gas and oil. If the strut leaks or loses pressure, the car will sit low at the rear. Replacement struts from Bilstein or Sachs are available. Some owners convert to conventional shocks and springs to avoid high repair costs. If you convert, you must also remove the SLS pump and install a block-off plate. RockAuto does not sell conversion kits; check specialist forums.

Age-Related Wear on Bushings

Rubber components harden after 30+ years. Replace all bushings if you are overhauling the rear. The trailing arm bushings are a common cause of a wandering feel. Use a hydraulic press or buy pre-pressed arms. RockAuto's complete control arms are a time saver.

Final Recommendation

For a 1990 300TE, prioritize safety and ride quality. Buy OEM for critical parts: Lemförder control arms, Sachs shocks/struts, and Febi springs. For sway bar links and bushings, Moog offers a good balance of cost and durability. Use RockAuto's vehicle filter and part number cross-reference to ensure fitment. Replace in pairs (shocks, springs, arms) to maintain balance. If you have SLS, budget for potentially expensive struts—or research a conversion. By sourcing parts from RockAuto and doing the work yourself, you can keep your 300TE driving like new without overpaying.