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🧾 Overview
The TeraFlex Dana 44 AdvanTEK M220 HD Differential Cover Kit is a heavy-duty rear axle protection upgrade designed specifically for JL Wrangler and JT Gladiator models equipped with the Dana 44 AdvanTEK (M220) rear axle.
Constructed from 3/8" thick high-strength ductile iron, this cover is built to withstand serious off-road abuse—protecting your differential from rocks, debris, and impacts while reinforcing the axle housing under load.
Designed with modern serviceability in mind, it features a large-diameter fill port and mid-level inspection port, making fluid changes and checks easier than traditional covers.
✔ Heavy-duty protection for Dana 44 AdvanTEK (M220) rear axles
✔ 3/8" thick ductile iron construction for extreme durability
✔ Reinforces axle housing and supports gear alignment
✔ Large fill port and inspection port for easier servicing
✔ Direct bolt-on upgrade for JL/JT platforms
🛠 Installation
- Direct bolt-on replacement for factory differential cover.
- Requires draining and refilling differential fluid.
- Estimated install time: ~1 hour
📌 Specs
📌 Key Features & Benefits
- 3/8" Ductile Iron Construction – Built to handle heavy impacts and trail abuse.
- Axle Housing Reinforcement – Adds rigidity to maintain proper gear alignment under load.
- AdvanTEK-Specific Design – Engineered specifically for JL/JT M220 rear axle housings.
- Large Fill Port – Allows easier gear oil filling with bottles or funnels.
- Inspection Port – Mid-height port allows quick fluid level checks.
📘 Specifications
- Brand: TeraFlex
- Product Type: Differential Cover
- Axle Type: Dana 44 AdvanTEK (M220) – Rear
- Material: 3/8" Thick Ductile Iron
- Finish: Black Powder Coat with Red TeraFlex Logo
- Mounting: Bolt-On
- Hardware: Included
- Installation Type: Bolt-On
- Sold As: Kit
📦 What’s Included (What’s in the Box)
- Differential Components
- (1) HD Differential Cover – M220 Rear
- Mounting Hardware
🛡 Warranty
- TeraFlex Limited Lifetime Warranty
⚠️ Fitment Notes
- Jeep Wrangler JL (2018–Present)
- Jeep Wrangler Unlimited JL (2018–Present)
- Jeep Gladiator JT (2020–Present)
⚠️ Fitment Notes
- ❗ Designed for Dana 44 AdvanTEK (M220) REAR axle only
- ❗ Will NOT fit standard Dana 44 (non-AdvanTEK) housings
- ❗ Common on Rubicon rear axles (verify before purchase)
- ❗ RTV sealant or gasket required (not always included)