6AN SS Braided Transmission Cooler Lines 70in - Improved Cooling

In this review of the 6AN SS Braided Transmission Cooler Lines, the bottom line is simple: this kit is for DIYers and performance-minded mechanics who need a durable, leak-resistant upgrade for transmission cooling. The reviewer found the strength of the stainless steel braided construction and the PTFE core to be the single biggest reason to buy, since those materials combine heat and corrosion resistance with good bending behaviour for tight engine bays. The kit ships with multiple fittings and two 70in lines, making it a practical universal option for many Chevy, GM and Ford transmission swaps.

Key Features

• Durable stainless steel braid: The external braid provides abrasion resistance and added tensile strength to survive underhood routing and vibration.
• High-strength PTFE core: The PTFE inner hose resists heat, low temperatures and chemical attack to protect fluid integrity over time.
• Universal 6AN fitment: Includes adapters for common Chevy, GM and Ford transmissions so the kit works with many Turbo 4L60E, TH350, TH400, 700R4 and similar models.
• Anti-leak rubber boots: Rubber-covered connections improve sealing at fittings and reduce the chance of leaks after installation.
• Complete accessory kit: Two 70in hoses plus a selection of AN-to-NPT/NPS adapters and 90 degree fittings make installation straightforward for varied vehicle setups.

Who It's For

This kit suits vehicle owners upgrading or replacing transmission cooler lines on performance builds, turbo installations, or older trucks where stock lines are failing. A mechanic or competent DIYer who can route hoses, choose the correct adapters and tighten AN fittings will get the most from this product.

It is not ideal for someone wanting a vehicle-specific, bolt-in hose with pre-bent, measured lengths for a single model. Buyers who prefer dealer replacement parts that match original routing without any fitting selection should look at OEM options instead.

Pros & Cons

Pros

• Strong stainless braid and PTFE core offer durable, heat-resistant service life.
• Comes with multiple adapters and 90 degree fittings so it can be adapted to many transmissions.
• 70in length per line gives flexibility for routing in trucks and performance cars.

Cons

• Universal kit requires the installer to select and fit the correct adapters and trim hoses, which adds installation time.

Specifications

Line diameter (inside)	3/8 in
Line length	70 in (each)
Fitting size	6AN with multiple adapter types
Material - braid	Stainless steel
Material - core	High-strength PTFE (Teflon)
Included items	2 hoses, adapters (6AN to 1/4NPT, 6AN to 1/4NPS, 6AN to 3/8NPT), 90 degree fittings

Our Verdict

The 6AN SS Braided Transmission Cooler Lines kit is a practical, value-minded upgrade for anyone needing stronger, heat-resistant transmission plumbing across a range of Chevy, GM and Ford models. Its materials and included adapters deliver reliability and cooling benefits, though installers should be prepared for some trimming and fitting work. For performance builds and maintenance where durability matters, this kit offers solid value.

Frequently Asked Questions

Will these lines fit my transmission?
The kit is designed as a universal 6AN solution and lists compatibility with many Chevy, GM and Ford transmissions; you will need to select the correct adapter included in the package for your particular transmission.

Are the fittings leak resistant?
The connections are covered with rubber boots and use AN fittings and adapters to improve sealing, which helps prevent leaks when installed correctly and tightened to spec.

Can I route these lines near high-heat areas?
The PTFE core and stainless braid improve heat resistance, but standard routing best practices should be followed to avoid direct contact with extreme exhaust heat without additional shielding.