ICT Billet Transmission Adapter Fittings -6AN to 1/4" NPSM Pair, Aluminum, O-Rings

These ICT Billet aluminum adapter fittings convert -6AN flare lines to 1/4" NPSM ports, letting you build custom transmission fluid lines for a wide range of GM and Ford transmissions.

When you need to adapt aftermarket -AN hoses to factory transmission case ports, these billet adapter fittings provide a compact, durable solution. Machined from USA-produced aerospace-grade aluminum in Wichita, Kansas, the pair includes o-rings and fits many popular transmissions through 2007. They allow you to run custom feed or return lines to and from TH350, TH400, 4L60E, 700R4, 200-4R, TR6060, AOD, 4R100, 4R70W and C5 transmissions.

Will these adapters work with my transmission model?

These fittings are designed to interface with common GM and Ford transmission case ports using 1/4" NPSM threads and accept -6AN female hose ends. They are compatible with many factory cases up to 2007 but always verify your case port thread type before ordering.

• Fits TH350, TH400, 4L60E, 700R4, 200-4R, TR6060
• Also fits Ford AOD, 4R100, 4R70W and C5 transmissions
• Designed for 1/4" NPSM case ports and -6AN lines
• Check case threads if unsure; OEM cases vary by year/model

How do these fittings make custom -AN transmission lines simpler?

Instead of modifying factory ports or running adaptors that add length and leak points, these billet adapters provide a direct, secure transition from the transmission case to -6AN hose assemblies. They come with o-rings for a reliable seal and a compact profile to keep routing neat.

• Direct -6AN to 1/4" NPSM interface minimizes extra adapters
• Includes o-rings for improved sealing at the case port
• Compact length helps with tight engine bay routing
• Billet aluminum resists corrosion and heat for longevity

What materials and manufacturing standards are used?

ICT Billet machines these adapters from aerospace-grade, USA-produced billet aluminum in Wichita, Kansas. The material choice and CNC machining process ensure consistent threads, concentric bores, and strong structural integrity for repeated use.

• Aerospace-grade billet aluminum for strength and weight savings
• Precision CNC machining for accurate threads and sealing surfaces
• Made in the USA (Wichita, Kansas) with quality controls
• Includes o-rings optimized for transmission fluid environments

How do I install these adapters and what should I watch for?

Installation is straightforward: remove the factory plug or fitting, install the included o-ring, and thread the adapter into the transmission case port to the correct torque. Use care to avoid cross-threading and confirm port type first; if your case uses a different thread standard, these will not seal properly.

• Remove any factory plugs and clean the port before install
• Fit the supplied o-ring to the adapter for the case seal
• Hand-start threads, then torque to manufacturer guidance
• Check for leaks after initial fluid pressure or road testing

Who is this for? These ICT Billet adapter fittings are aimed at vehicle builders, transmission specialists, and DIY enthusiasts who want a tidy, reliable way to connect -6AN aftermarket lines to common transmission case ports. If you’re customizing cooler lines, installing remote filters, or fabricating a performance transmission plumbing setup and your case uses 1/4" NPSM ports, these fittings simplify the job while offering durable, precision-machined hardware. Confirm your transmission’s port thread type and year before purchasing to ensure compatibility.