--- product_id: 182989039 title: "Torque Trailer Air Spring Bag Replacement for Firestone 9978, W01‑358‑9978" price: "1795.16 DT" currency: TND in_stock: true reviews_count: 3 url: https://www.desertcart.tn/products/182989039-torque-trailer-air-spring-bag-replacement-for-firestone-9978-w01 store_origin: TN region: Tunisia --- # 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 **Price:** 1795.16 DT **Availability:** ✅ In Stock ## Summary > 🚛 Elevate your ride with Torque’s toughest air spring bag — because your trailer deserves the best! ## Quick Answers - **What is this?** Torque Trailer Air Spring Bag Replacement for Firestone 9978, W01‑358‑9978 - **How much does it cost?** 1795.16 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/182989039-torque-trailer-air-spring-bag-replacement-for-firestone-9978-w01) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Leak-Proof Confidence:** Top-tier leak test ratio ensures long-lasting air retention and performance. - • **Built to Outperform OEM:** Rubber thickness and steel studs exceed industry standards for unmatched durability. - • **Industry-First Warranty:** 3-year unlimited mile warranty backs your investment with unmatched peace of mind. - • **Precision Fit Guaranteed:** Compatible with Firestone 9978 and multiple Hendrickson models for seamless replacement. - • **Heavy-Duty Composite Pistons:** Engineered for enhanced strength and reliability under pressure. ## Overview The Torque Trailer Air Spring Bag Replacement (model TR9978) is engineered with 4.5-5.00 mm thick rubber and 25% stronger 4140 grade steel studs, surpassing OEM standards. Designed for Firestone 9978 and Hendrickson C-28929/S-28929 compatibility, it features stronger composite pistons and the highest leak test ratio after assembly. Backed by an industry-first 3-year unlimited mile warranty, this air spring bag ensures durability, reliability, and a perfect fit for professional-grade trailer 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 Review: Work great - Love it Review: They fit - Just installed so I’ll give them 3 stars for now ## 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 | |---------------|-------| | Manufacturer | Torque | | Brand | Torque | | Model | TR9978 | | Item Weight | 15.97 pounds | | Package Dimensions | 12.1 x 11.9 x 11.8 inches | | Item model number | TR9978 | | Is Discontinued By Manufacturer | No | | Manufacturer Part Number | TR9978 | | OEM Part Number | Firestone 9978, Hendrickson C-28929, S-28929, Firestone W01-358-9978, Hendrickson C28929, S28929, Firestone W013589978 | | 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) ![Torque Trailer Air Spring Bag Replacement for Firestone 9978, W01‑358‑9978 - Image 2](https://m.media-amazon.com/images/I/61leVLHtQNL.jpg) ![Torque Trailer Air Spring Bag Replacement for Firestone 9978, W01‑358‑9978 - Image 3](https://m.media-amazon.com/images/I/41ncPlIElAL.jpg) ![Torque Trailer Air Spring Bag Replacement for Firestone 9978, W01‑358‑9978 - Image 4](https://m.media-amazon.com/images/I/31Bu-6JE5fS.jpg) ![Torque Trailer Air Spring Bag Replacement for Firestone 9978, W01‑358‑9978 - Image 5](https://m.media-amazon.com/images/I/61auW9i1FbL.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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Work great *by S***S on September 7, 2023* Love it ### ⭐⭐⭐ They fit *by T***T on September 19, 2022* Just installed so I’ll give them 3 stars for now ### ⭐ One month *by A***W on July 10, 2023* Bag stretched completely out like a hot dog then exploded. ## 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.tn/products/182989039-torque-trailer-air-spring-bag-replacement-for-firestone-9978-w01](https://www.desertcart.tn/products/182989039-torque-trailer-air-spring-bag-replacement-for-firestone-9978-w01) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-07-30*