---
product_id: 328727918
title: "TeraFlex 4990910 Gusset Kit (JK Front Lower Inner Knuckle)"
brand: "teraflex"
price: "¥23595"
currency: JPY
in_stock: true
reviews_count: 1
category: "Tera Flex"
url: https://www.desertcart.jp/products/328727918-teraflex-4990910-gusset-kit-jk-front-lower-inner-knuckle
store_origin: JP
region: Japan
---

# Super beefy alloy steel build Fits all JK Wrangler models 5/8" thick weld-on strength TeraFlex 4990910 Gusset Kit (JK Front Lower Inner Knuckle)

**Brand:** teraflex
**Price:** ¥23595
**Availability:** ✅ In Stock

## Summary

> 🛡️ Fortify your JK’s front axle—because breaking is not an option!

## Quick Answers

- **What is this?** TeraFlex 4990910 Gusset Kit (JK Front Lower Inner Knuckle) by teraflex
- **How much does it cost?** ¥23595 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/328727918-teraflex-4990910-gusset-kit-jk-front-lower-inner-knuckle)

## Best For

- teraflex enthusiasts

## Why This Product

- Trusted teraflex brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Complete Kit:** Includes two lower inner knuckle gussets, providing essential reinforcement where factory parts fall short.
- • **Precision Fitment:** Custom-designed for JK Dana 30 & 44 axles, ensuring seamless installation on all JK Wrangler variants.
- • **Premium Alloy Steel:** Crafted from high-grade alloy steel for maximum toughness and long-lasting reliability.
- • **Unmatched Durability:** Weld-on 5/8" thick gussets engineered to withstand extreme off-road stress.
- • **Reinforced Performance:** Prevents bending and breaking under heavy loads, perfect for larger tires and rugged terrains.

## Overview

The TeraFlex 4990910 Gusset Kit is a premium weld-on reinforcement solution for JK Wrangler front lower inner knuckles. Made from 5/8" thick alloy steel, it strengthens Dana 30 and 44 factory axles to prevent bending or breaking under extreme off-road conditions. Compatible with all JK Wrangler models, including Rubicon and Unlimited, this kit includes two gussets designed for a precise fit and superior durability.

## Description

The TeraFlex JK front lower inner knuckle gusset kit is designed to reinforce the weak factory knuckles on JK Dana 30 or 44 factory axles. This prevents unwanted bending or breaking under extreme conditions. Includes two lower inner knuckle gussets. Fits all JK Wrangler models including Rubicon and Unlimited.

Review: Good fitment - Strengthening a front Dana 30 is a must for larger tires. This gusset along with upper gussets and sleeves works well.

## Features

- Weld On
- 5/8" thick
- Super Beefy

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00CI42IF6 |
| Brand | TeraFlex |
| Brand Name | TeraFlex |
| Customer Reviews | 4.1 out of 5 stars 6 Reviews |
| Global Trade Identification Number | 00843885014973 |
| Item Weight | 1.02 kg |
| Manufacturer | TeraFlex |
| Material | Alloy Steel |
| Material Type | Alloy Steel |
| Model | 4990910 |
| Part Number | 4990910 |
| UPC | 843885014973 |

## Product Details

- **Brand:** TeraFlex
- **Material:** Alloy Steel
- **UPC:** 843885014973
- **Manufacturer:** TeraFlex
- **Global Trade Identification Number:** 00843885014973

## Images

![TeraFlex 4990910 Gusset Kit (JK Front Lower Inner Knuckle) - Image 1](https://m.media-amazon.com/images/I/61laLl40P-L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good fitment
*by J***C on 8 August 2019*

Strengthening a front Dana 30 is a must for larger tires. This gusset along with upper gussets and sleeves works well.

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**Shop now:** [https://www.desertcart.jp/products/328727918-teraflex-4990910-gusset-kit-jk-front-lower-inner-knuckle](https://www.desertcart.jp/products/328727918-teraflex-4990910-gusset-kit-jk-front-lower-inner-knuckle)

---

*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-07-08*