ICT Billet 4L80E Transmission Adapter -6AN Front & Rear Kit, Billet Aluminum O-Ring Seal

ICT Billet's 4L80E -6AN adapter kit converts the factory front and rear transmission cooler ports to -6AN fittings for straightforward, reliable AN line connections.

This precision-machined adapter set is made specifically for GM 4L80E transmissions and provides a clean, leak-resistant means to run aftermarket AN transmission cooler lines. Machined from aerospace-grade billet aluminum in Wichita, Kansas, the kit includes a short front fitting, a long rear fitting and two O-rings, and it uses the standard GM transmission case thread (0.516" O.D., 1/4" NPSM thread). Whether you are building an upgraded cooling loop for towing, racing, or improved longevity under load, these adapters give you a durable, serviceable interface to attach AN hoses and external coolers.

How do these adapters attach to my 4L80E transmission?

Each adapter screws into the transmission cooler ports where factory fittings or lines normally connect. The external end accepts a -6AN (6 AN flare) hose fitting so you can route AN braided lines to an external cooler or remote cooler assembly.

• Thread O.D.: 0.516", matches standard GM case threads
• Thread type: 1/4" NPSM internal port engagement
• Adapter ends: -6AN female flare for AN line compatibility
• Includes two O-rings to seal against leaks

Will this kit fit both front and rear cooler ports?

Yes. The set contains two purpose-length adapters: a shorter fitting intended for the front cooler port and a longer fitting designed for the rear port. The different lengths ensure proper reach and clearance when installing AN lines on various chassis and transmission orientations.

• Short front adapter for tight frontal access
• Long rear adapter to clear housings and brackets
• Both are machined to the same thread spec for interchangeability

What vehicles and transmissions are compatible with these fittings?

These adapters are made for GM 4L80E transmission models and fit many LS-series engine platforms using that transmission. They are commonly used on conversions and performance builds where AN lines and aftermarket coolers replace factory hoses.

• Designed for 4L80E family transmissions
• Frequently used with LS engine swaps and GM applications
• Works with aftermarket coolers, braided AN hoses, and hose ends

What materials and parts are included in the package?

ICT Billet machines the adapters from USA-produced, aerospace-grade billet aluminum for strength and corrosion resistance. The kit ships with two bare-aluminum adapters and two O-rings so you can install and seal the fittings immediately.

• Material: aerospace-grade billet aluminum, US-made
• Finish: bare aluminum (uncoated)
• Package contents: 1 front fitting, 1 rear fitting, 2 O-rings

Who this fits: This adapter kit is aimed at mechanics, fabricators and DIY enthusiasts upgrading the cooling system on GM transmissions—especially those running 4L80E setups with LS-series engines. If you need a dependable way to convert factory cooler ports to -6AN hose connections for improved cooling capacity or custom routing, this machined, US-made solution provides a compact, serviceable interface for aftermarket hoses and coolers.