Jecoupoon 6AN 70in Stainless-Steel Transmission Cooler Hose Kit — Fits TH350/4L60E/4L80E, Braided Durable

Jecoupoon 70" 6AN stainless-steel braided transmission cooler hose kit is a complete, flexible line set designed to improve cooling reliability for TH350, 4L60/4L60E/4L65E and 4L80E transmissions.

This kit supplies two 70-inch 6AN braided stainless-steel hoses and matching fittings engineered to replace worn or undersized cooler lines. Built for workshops and performance builds, the assembly focuses on durability, leak resistance and easy routing through engine bays. The stainless braid and 6AN adapters make the kit compatible with a wide range of classic and modern automatic gearboxes while offering improved heat-shedding capacity compared with many stock rubber lines.

How will this kit affect transmission cooling performance?

The larger 6AN diameter and longer 70" hose length increase fluid flow and surface area exposed to ambient air, helping transmission fluid shed heat faster during heavy use. Better flow and durable hose material reduce the risk of swelling and collapse under pressure.

• 6AN fittings support higher flow than smaller OEM lines
• Braided stainless exterior resists abrasion and engine-bay heat
• 70" length allows flexible routing to optimize airflow past the cooler

What vehicles and transmissions is this compatible with?

The kit is intended for many Chevrolet and GM transmissions as well as popular swap applications. It fits a range of TH350, Turbo 350/400, TH200/200R4, 700R4, 4L60, 4L60E, 4L65E and 4L80E models when using standard cooler fittings and adapters.

• Directly compatible with 4L60/4L60E/4L65E transmissions
• Works with 1996–2021 4L80E installations and older TH350/TH400 setups
• Includes universal 6AN ends for use with most aftermarket coolers and adapters

How easy is installation and what hardware is included?

The hoses are flexible and intended to bend without kinking, allowing straightforward installation in tight engine bays. Standard 6AN ends thread onto most aftermarket fittings; depending on your vehicle you may need simple adapters for factory cooler ports.

• Flexible stainless braid lets you route hoses around brackets and crossmembers
• Good sealing performance reduces the chance of fluid leaks after install
• No crimping tools required if using supplied pre-assembled ends

What are the material and durability features I should know about?

The hoses use a woven stainless-steel outer layer over a fuel- and transmission-fluid-safe inner liner for strength and chemical resistance. That construction protects against abrasion, hardening and failure that can occur with rubber lines over time.

• Stainless-steel braid resists cuts, chafing and elevated under-hood temperatures
• Inner liner engineered to tolerate transmission fluid without swelling
• Quality sealing at fittings minimizes leak paths and maintains pressure integrity

Who this is for: mechanics, hot-rodders and DIY enthusiasts replacing aging cooler lines or performing transmission swaps will find this Jecoupoon kit useful. It’s aimed at anyone upgrading from OEM rubber hoses to a longer-lasting, higher-flow solution for TH350, Turbo 350/400, 200/200R4, 700R4 and the 4L60/4L60E/4L65E/4L80E family of transmissions. If your project needs flexible routing, improved abrasion resistance and 6AN connectivity for aftermarket coolers, this kit is a practical choice.