---
product_id: 182989039
title: "TORQUE Trailer Air Spring Bag (Replaces Firestone 9978, W01-358-9978, Hendrickson S-28929, C-28929) (TR9978)"
brand: "torque"
price: "€ 306.84"
currency: EUR
in_stock: true
url: https://www.desertcart.hr/products/182989039-torque-trailer-air-spring-bag-replaces-firestone-9978-w01-358
store_origin: HR
region: Croatia
---

# Highest leak test ratio post-assembly 4.5-5.00 mm thick premium rubber 25% stronger 4140 steel studs TORQUE Trailer Air Spring Bag (Replaces Firestone 9978, W01-358-9978, Hendrickson S-28929, C-28929) (TR9978)

**Brand:** torque
**Price:** € 306.84
**Availability:** ✅ In Stock

## Summary

> 🚛 Elevate your ride with torque-tested toughness!

## Quick Answers

- **What is this?** TORQUE Trailer Air Spring Bag (Replaces Firestone 9978, W01-358-9978, Hendrickson S-28929, C-28929) (TR9978) by torque
- **How much does it cost?** € 306.84 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/182989039-torque-trailer-air-spring-bag-replaces-firestone-9978-w01-358)

## 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

- • **Precision Fitment:** Designed to replace multiple OEM parts including Firestone 9978 and Hendrickson S-28929, ensuring seamless compatibility.
- • **Unmatched Durability:** Built with 25% stronger 4140 grade steel studs for long-lasting performance under pressure.
- • **Leak-Proof Confidence:** Achieves the highest leak test ratio after final assembly, minimizing downtime and maintenance.
- • **Industry-First Warranty:** Backed by a 3-year unlimited mile warranty, reflecting unmatched quality and customer trust.
- • **Premium Rubber Thickness:** 4.5 to 5.00 mm thick rubber exceeds OEM standards, ensuring superior wear resistance.

## Overview

The TORQUE Trailer Air Spring Bag TR9978 is engineered for professional-grade suspension reliability, featuring 25% stronger steel studs, premium thick rubber exceeding OEM specs, and the highest leak resistance in its class. Compatible with top OEM models and backed by an industry-leading 3-year unlimited mile warranty, it’s the smart upgrade for managers who demand durability and peace of mind on every haul.

## Description

Full description not available

## 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 (Replaces Firestone 9978, W01-358-9978, Hendrickson S-28929, C-28929) (TR9978) - Image 1](https://m.media-amazon.com/images/I/61OF9+Rh0kL.jpg)
![TORQUE Trailer Air Spring Bag (Replaces Firestone 9978, W01-358-9978, Hendrickson S-28929, C-28929) (TR9978) - Image 2](https://m.media-amazon.com/images/I/61leVLHtQNL.jpg)
![TORQUE Trailer Air Spring Bag (Replaces Firestone 9978, W01-358-9978, Hendrickson S-28929, C-28929) (TR9978) - Image 3](https://m.media-amazon.com/images/I/41ncPlIElAL.jpg)
![TORQUE Trailer Air Spring Bag (Replaces Firestone 9978, W01-358-9978, Hendrickson S-28929, C-28929) (TR9978) - Image 4](https://m.media-amazon.com/images/I/31Bu-6JE5fS.jpg)
![TORQUE Trailer Air Spring Bag (Replaces Firestone 9978, W01-358-9978, Hendrickson S-28929, C-28929) (TR9978) - 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.

## Frequently Bought Together

- TORQUE Trailer Air Spring Bag (Replaces Firestone 9978, W01-358-9978, Hendrickson S-28929, C-28929) (TR9978)
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**Shop now:** [https://www.desertcart.hr/products/182989039-torque-trailer-air-spring-bag-replaces-firestone-9978-w01-358](https://www.desertcart.hr/products/182989039-torque-trailer-air-spring-bag-replaces-firestone-9978-w01-358)

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-04-23*