Yunnergo Transmission Cooler Lines Kit 70-inch Braided PTFE Hoses with AN/NPT Adapters

The Yunnergo 70" transmission cooler lines kit is a ready-to-install stainless steel braided 6AN hose system designed to route transmission fluid safely and reliably for a wide range of automatic gearboxes including 4L80E, TH400 and 700R4.

This complete line set gives you two 70-inch hoses plus a selection of AN and NPT adapters so you can adapt the hoses to stock or custom cooler fittings. Built with PTFE inner liners and stainless-steel braid, the kit is intended to resist heat, abrasion and pressure while remaining flexible enough to fit tight engine bays or custom routing. The supplied fittings cover common transmissions and aftermarket coolers, reducing the need for additional adapters during installation.

Will these hoses fit my 4L80E or TH400 transmission?

Yes — the kit is packaged to be compatible with a broad list of automatic transmissions including 4L80E, TH400 and 700R4. The assortment of 6AN to NPT/NPS adapter fittings lets you match the hose ends to the stock or aftermarket cooler ports on most vehicles.

• Two 70" braided hoses with 3/8" inner diameter for common flow rates
• Included 6AN 90-degree female-to-male adapters for tight clearances
• Multiple 6AN to 1/4NPT, 3/8NPT and 1/4NPS adapters for cross-compatibility

How durable and flexible are the braided lines for installation?

The hoses use a PTFE liner wrapped in stainless-steel braid, which balances flexibility and mechanical protection. The braid keeps the hose from kinking and guards against chafing, while the PTFE liner resists high transmission temperatures and fluid exposure.

• Stainless-steel braid for abrasion resistance and pressure containment
• PTFE inner tube resists heat and transmission fluid breakdown
• Sufficient bend radius for complex engine bay routing without kinking

What fittings come with the kit and why are they useful?

The kit includes a selection of AN and NPT/NPS adapters so you can connect the 6AN hoses to a variety of cooler ports and transmission outlets. This assortment reduces the need to buy additional adapters when swapping between stock connections and aftermarket coolers or remote coolers.

• Four 90° 6AN female-to-male adapters for angled connections
• Four 6AN-to-1/4NPT adapters, two 6AN-to-3/8NPT and two 6AN-to-1/4NPS adapters
• All fittings enable a secure, leak-resistant connection when properly assembled

How does installing these lines affect cooling and reliability?

Using braided PTFE lines maintains consistent flow to and from the transmission cooler, which supports stable transmission temperatures and can improve long-term component life when paired with an adequate cooler. Properly sized hoses and leak-free fittings ensure reliable fluid circulation under varying loads and temperatures.

• 3/8" inner diameter designed for effective flow rates in many systems
• Secure AN fittings reduce leak risk compared with some push-on styles
• Stainless braid protects lines from road debris and contact points

Who is this for: The Yunnergo 70" transmission cooler lines kit is aimed at mechanics, DIY enthusiasts and performance builders who need a flexible, durable hose set for GM and other automatic transmissions (4L60E, 4L80E, TH350, TH400, 700R4, AOD/C5 and similar). It’s also suitable for anyone installing an aftermarket cooler, replacing aging rubber lines, or customizing fluid routing on hot-rodded or towing vehicles where higher temperature and abrasion resistance are required.