--- product_id: 182989039 title: "Torque Trailer Air Spring Bag Replacement for Firestone 9978, W01‑358‑9978" brand: "torque" price: "£227.52" currency: GBP in_stock: true category: "Torque" url: https://www.desertcart.co.uk/products/182989039-torque-trailer-air-spring-bag-replacement-for-firestone-9978-w01 store_origin: GB region: United Kingdom --- # Highest leak test ratio post-assembly 4.5-5.00 mm thick premium rubber 25% stronger 4140 steel studs Torque Trailer Air Spring Bag Replacement for Firestone 9978, W01‑358‑9978 **Brand:** torque **Price:** £227.52 **Availability:** ✅ In Stock ## Summary > 🚛 Elevate your ride with torque-tested toughness! ## Quick Answers - **What is this?** Torque Trailer Air Spring Bag Replacement for Firestone 9978, W01‑358‑9978 by torque - **How much does it cost?** £227.52 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/182989039-torque-trailer-air-spring-bag-replacement-for-firestone-9978-w01) ## Best For - torque enthusiasts ## Why This Product - Trusted torque brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Unrivaled Strength:** 4140 grade steel studs deliver 25% more toughness for heavy-duty reliability. - • **Leak-Proof Confidence:** Top-tier leak test ratio ensures long-lasting, worry-free performance. - • **Built to Outperform OEM:** Rubber thickness surpasses industry standards for unmatched durability. - • **Industry-First Warranty:** 3-year unlimited mile warranty backs your investment with unmatched peace of mind. - • **Precision Fit Guaranteed:** Designed to replace multiple OEM parts—check specs, not just model numbers. ## Overview The Torque Trailer Air Spring Bag Replacement (model TR9978) is engineered with 4.5-5.00 mm thick rubber exceeding OEM specs, reinforced by 25% stronger 4140 grade steel studs and composite pistons. It boasts the highest leak test ratio after assembly, ensuring durability and reliability. Compatible with Firestone 9978 and Hendrickson C-28929 among others, it comes with an industry-first 3-year unlimited mile warranty, making it the smart choice for professional-grade suspension upgrades. ## Description Buy Torque Trailer Air Spring Bag Replacement for Firestone 9978, W01‑358‑9978 | Hendrickson S28929, C28929, C29928, S29928 Goodyear 1R12‑1179, 1R12‑668 Dayton 452‑9978 Contitech 67588, 69744, 9 10‑14 P 959: Shocks, Struts & Suspension - desertcart.com ✓ FREE DELIVERY possible on eligible purchases ## Features - QUALITY - Easy to identify part number permanently engraved on the rubber. 4.5 - 5.00 mm thick rubber that exceeds OEM requirements. 25% stronger 4140 grade steel studs. Stronger composite pistons. Highest leak test ratio after final assembly. - SPECS - Extended Height: 18.00" // Compressed Height: 7.90" // Top Plate Width: 9.00" // Piston Width: 10.16" // Weight: 15.10 lbs - REPLACEMENT FOR - Hendrickson C-28929, S-28929 // Firestone W01-358-9978 // Triangle AS-8959 // AS9978, HDV9978, HD9978 // Sampa SP559978-KP - WARRANTY - Thanks to our superior quality and customer service we started offering our customers industry's first 3-year unlimited mile warranty on our rolling lobe / reversible sleeve air springs. When you get your air spring, please register it through Torque Parts website. - FITMENT - Please, call your dealer and ask for the part number. Then, check out if this air bag replaces it. Or, see the diagram picture and make sure all specs match with your air bag. ***Buying an air bag by make and model is one of the most common mistakes. Please, do not buy it by make and model.*** ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07GNT2WYY | | Best Sellers Rank | #974,080 in Automotive ( See Top 100 in Automotive ) #45,020 in Automotive Shocks, Struts & Suspension Products | | Brand | Torque | | Customer Reviews | 4.3 4.3 out of 5 stars (30) | | Date First Available | August 20, 2018 | | Item Weight | 15.97 pounds | | Item model number | TR9978 | | Manufacturer | Torque | | Manufacturer Part Number | TR9978 | | Model | TR9978 | | OEM Part Number | Firestone 9978, Hendrickson C-28929, S-28929, Firestone W01-358-9978, Hendrickson C28929, S28929, Firestone W013589978 | | Package Dimensions | 12.1 x 11.9 x 11.8 inches | | Special Features | 25% stronger 4140 grade steel studs., 4.5 - 5.00 mm trick rubber that exceeds OEM requirements., Highest leak test ratio after final assembly., Stronger composite pistons. | ## Images ![Torque Trailer Air Spring Bag Replacement for Firestone 9978, W01‑358‑9978 - Image 1](https://m.media-amazon.com/images/I/61OF9+Rh0kL.jpg) ## Available Options This product comes in different **Color** options. ## Questions & Answers **Q: How could I purchase correct air spring bags for my truck/trailer ?** A: Please ask your dealer for the correct part number for your vehicle, with your VIN number. **Q: Why Torque Parts ?** A: Air Springs manufactered and tested by Torque Parts are made of higher quality components and thicker rubber which result in a much longer product life than our competitors. **Q: What does Torque Parts do ?** A: Torque Parts is a U.S.-based company specializing in air springs for pickup trucks, semi-trucks, and trailers. We offer over 1,000 different parts under the Torque Parts. Our headquarters is in Chicago, IL, with multiple warehouses around the USA. **Q: How can I reach to Torque Parts ?** A: You can contact Torque Parts LLC. Our dedicated team is available to provide assistance and address any questions you may have. We are committed to ensuring your satisfaction and look forward to helping you with your needs. ## Frequently Bought Together - TORQUE Trailer Air Spring Bag (Replaces Firestone 9978, W01-358-9978, Hendrickson S-28929, C-28929) (TR9978) - Belgrade Parts & Service, Inc. Tramec 31402 3/8'' NPTF Air Brake Hose End Fitting Kit for 3/8" Hose --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/182989039-torque-trailer-air-spring-bag-replacement-for-firestone-9978-w01](https://www.desertcart.co.uk/products/182989039-torque-trailer-air-spring-bag-replacement-for-firestone-9978-w01) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-10-03*