ICT Billet 4L80E Transmission Adapter Kit -6AN Front & Rear Fittings, Billet Aluminium

The ICT Billet 4L80E Transmission Adapter set provides two purpose-machined aluminum fittings — a shorter front fitting and a longer rear fitting — that thread into GM 4L80E transmission cooler ports and adapt the case threads to -6AN flare connections. Manufactured from USA-produced aerospace-grade billet aluminum in Wichita, Kansas, the kit includes two O-rings and a bare-aluminum finish for straightforward installation on compatible GM transmissions.

Will these adapters fit my 4L80E transmission and which ports do they service?

These adapters are specifically machined for transmissions using the GM 4L80E family and match the standard transmission case cooler thread (O.D. .516", 1/4" NPSM equivalent in O.D.). The kit supplies one short fitting intended for the front port and one longer fitting designed to reach the rear port where extra length is typically required.

• Compatible with many GM engines and assemblies such as LS1, LS2, LS3, LS6, LQ4, LQ9, L92, L76, L59, LH6, LM4, LM7, LR4, and others.
• Front fitting: shorter profile for the forward cooler port location.
• Rear fitting: extended reach to clear housings and allow proper hose routing.
• Threads: GM transmission case standard, intended to accept -6AN male flare hose ends.

How do I install the -6AN fittings and what tools are needed?

Installation requires minimal tools and is a straightforward process: remove old plugs or fittings, install the O-rings provided, thread the correct adapter into each cooler port, then attach your -6AN hose ends. Use a torque wrench or hand tools to snug fittings without over-tightening; the aluminum fittings seat against O-rings rather than metal-metal sealing to prevent damage.

• Tools: suitable wrench or socket, torque wrench recommended, thread-safe lubricant if desired.
• Parts: includes one front and one rear fitting plus two O-rings; additional AN hose ends required.
• Tip: confirm port orientation and routing before final tightening to avoid interference.
• Do not cross-thread; start fittings by hand and align before torqueing.

Why choose billet aluminum adapters and what performance or durability benefits do they offer?

Billet aluminum offers precision machining, corrosion resistance, and a strong yet lightweight solution for fluid connections compared with cast or stamped alternatives. ICT Billet uses aerospace-grade, USA-produced billet aluminum for consistent threads and surfaces, which helps ensure reliable sealing and long-term service when combined with proper O-ring installation.

• Aerospace-grade billet: tighter tolerances and smooth sealing surfaces.
• Lightweight and corrosion-resistant compared with steel in many environments.
• Durable thread forms reduce risk of galling or leak paths when installed correctly.
• Made in Wichita, Kansas — domestic manufacturing quality control.

Who is this for? The ICT Billet 4L80E -6AN adapter kit is aimed at vehicle owners, builders, and fabricators upgrading or repairing automatic transmission cooling systems on GM 4L80E-equipped vehicles. It suits enthusiasts fitting aftermarket coolers, custom hose lines, or performance cooling packages who need reliable, USA-made fittings that adapt the factory cooler ports to standard -6AN plumbing. Mechanics and DIYers will appreciate the included O-rings and the separate front/rear lengths for correct fitment, while vehicle restorers and hot-rodders will value the precise machining and domestic production pedigree.