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TORQUE Trailer Air Spring Bag (Replaces Firestone 9978, W01-358-9978, Hendrickson S-28929, C-28929) (TR9978)
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TORQUE Trailer Air Spring Bag (Replaces Firestone 9978, W01-358-9978, Hendrickson S-28929, C-28929) (TR9978)
Highest leak test ratio after final assembly.
TORQUE Trailer Air Spring Bag (Replaces Firestone 9978, W01-358-9978, Hendrickson S-28929, C-28929) (TR9978)
Item #: 35123159

TORQUE Trailer Air Spring Bag (Replaces Firestone 9978, W01-358-9978, Hendrickson S-28929, C-28929) (TR9978)

Item #: 35123159
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Highest leak test ratio after final assembly.
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What Stands Out

Compatible Design
Seamlessly replaces Firestone 9978 and other major brands, ensuring easy installation and minimizing downtime for users seeking reliable air suspension solutions.
High Durability
Constructed from superior materials for enhanced resistance to wear and tear, providing truck owners with long-lasting performance and less frequent replacements.
Improved Ride Quality
Engineered to optimize load leveling and reduce bounce, ensuring a smoother, more stable ride for trailers, ultimately enhancing safety and comfort on the road.

Product Details

Shop TORQUE Trailer Air Spring Bag (Replaces Firestone 9978, W01-358-9978, Hendrickson S-28929, C-28929) (TR9978) online at a best price in UK. B07GNT2WYY
  • Easy to identify part number permanently engraved on the rubber
  • 4.5-5.00mm thick rubber that exceeds OEM requirements
  • 25% stronger 4140 grade steel studs
  • Stronger composite pistons
  • Highest leak test ratio after final assembly
  • Replaces Hendrickson C-28929, S-28929, Firestone W01-358-9978
Item Weight5 lbs (2.27 kg)

Who Should Buy?

Suitable For
  • Frequent Towing

    Ideal for users who tow heavy trailers regularly, improving ride quality and load stability.

  • Commercial Use

    Benefits businesses that operate trucks, enhancing durability and performance under heavy loads.

  • Fleet Maintenance

    Perfect for fleet operators looking to enhance vehicle performance and reduce maintenance costs over time.

Not Suitable For
  • Light-Use Vehicles

    Not suitable for casual users with light-use vehicles, as performance improvements may not be noticeable.

  • Budget-Conscious Buyers

    May not fit well for users looking for the cheapest option, as it involves a moderate investment.

  • Non-Trailer Applications

    Designed specifically for trailers, thus unsuitable for other vehicle types or non-towing applications.

Product Description

TORQUE Trailer Air Spring Bag (Replaces Firestone 9978, W01-358-9978, Hendrickson S-28929, C-28929) (TR9978)

Have any Query? Chat with us

Customer Questions & Answers

  • Question: What is the primary function of the TORQUE Trailer Air Spring Bag?

    Answer: The TORQUE Trailer Air Spring Bag serves to provide enhanced suspension support for trailers, improving the ride quality. By maintaining proper air pressure, it helps to evenly distribute the load across the suspension, which can reduce wear on vehicle components. This is particularly beneficial when towing heavy loads, as it minimizes swaying and enhances stability.
  • Question: Can the TORQUE Trailer Air Spring Bag be used as a replacement for specific brands?

    Answer: Yes, the TORQUE Trailer Air Spring Bag is designed to be compatible with several notable brands, including Firestone and Hendrickson models. If your existing air spring bag has a part number such as Firestone 9978 or Hendrickson S-28929, this replacement ensures that you have a durable solution that fits seamlessly. Users can benefit from this compatibility, making it a versatile choice.
  • Question: How do I install the TORQUE Trailer Air Spring Bag?

    Answer: Installation of the TORQUE Trailer Air Spring Bag requires basic mechanical skills but can generally be done at home. You will need to lift the trailer, remove the old air spring, and replace it with the new bag, ensuring the air lines are properly connected. This DIY approach is cost-effective and allows you to inspect and maintain your trailer's suspension system, ensuring optimal performance.
  • Question: What are common signs that I need to replace my air spring bag?

    Answer: Common indicators that your air spring bag needs replacement include decreased ride quality, visible leaks, or uneven weight distribution in your trailer. If you notice a significant sagging of the trailer or excessive bouncing, it’s time to consider replacement. Recognizing these signs early can prevent further damage and costly repairs to your overall suspension system.
  • Question: Does the TORQUE Trailer Air Spring Bag require any specific maintenance?

    Answer: While the TORQUE Trailer Air Spring Bag is designed with durable materials to withstand varying conditions, it benefits from routine inspection and pressure checks. Regularly monitoring air pressure ensures proper functioning and enhances longevity. In high-load scenarios, be vigilant for any signs of wear or leaks, as proactive maintenance can save you from unexpected issues while on the road.
  • Question: What materials are used in the TORQUE Trailer Air Spring Bag?

    Answer: The TORQUE Trailer Air Spring Bag is constructed from high-quality rubber and reinforced materials that provide durability and robustness, capable of withstanding various weather conditions and heavy-duty use. This robust construction is essential for maintaining performance and reliability of the air suspension system, particularly when hauling heavy loads or during rough road conditions.
  • Question: Is the TORQUE Trailer Air Spring Bag suitable for all trailer types?

    Answer: While the TORQUE Trailer Air Spring Bag is versatile, it is most suitable for trailers that experience heavy loading and require enhanced suspension support. It's particularly beneficial for utility trailers, tow-behind campers, and any setting where load leveling is crucial. Assess your trailer specifications to ensure compatibility for optimal performance.
  • Question: How does the TORQUE air spring compare to other brands?

    Answer: The TORQUE Air Spring is designed to meet or exceed the specifications of competitors like Firestone and Hendrickson, often providing comparable performance at a competitive value. Users frequently find that TORQUE bags offer similar features in terms of load capacity and durability, making them a worthwhile alternative, especially for those seeking reliable solutions for their trailer's suspension needs.
  • Question: Can I use the TORQUE air spring without an air compressor?

    Answer: An air compressor is typically recommended for optimal performance of the TORQUE Trailer Air Spring Bag, as it helps maintain the correct air pressure needed for proper functioning. However, if you lack an air compressor, manual inflation with a pump can be an option, albeit it may require more effort and monitoring to ensure consistent air pressure.
  • Question: Where can I buy the TORQUE Trailer Air Spring Bag in UK?

    Answer: You can conveniently purchase the TORQUE Trailer Air Spring Bag through Ubuy, which offers a user-friendly platform for browsing and buying various automotive products. Ubuy provides detailed product information and customer service to assist you with your purchase, ensuring you find the right fit for your trailer needs.

Torque Shocks, Struts & Suspension Editorial Review

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“The product received very good packaging & safe…Thank You”

16 June 2026 · via Trustpilot
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“Accurate delivery timing given”

16 June 2026 · via Trustpilot
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“Not madly expensive like I thought, and much quicker than promised.”

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12 June 2026 · via Trustpilot
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Our Top Logistics Partners
  • fedex
  • dhl
Fastest cross-border delivery

Features & Benefits

  • Part number engraved on rubber
  • Rubber exceeds OEM requirements
  • Strong steel studs and composite pistons
  • Replaces Hendrickson C-28929, S-28929 and Firestone W01-358-9978
  • Extended Height: 18.00”, Compressed Height: 7.90”, Top Plate Width: 9.00”, Piston Width: 10.16”, Weight: 15.10 lbs

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