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Transmission Adapter Fittings to AN male for cooler lines
  • Transmission Adapter Fittings to AN male for cooler lines
Transmission Adapter Fittings to AN male for cooler lines

Transmission Adapter Fittings to AN male for cooler lines

$26.99 USD
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Transmission Adapter Fittings to AN — Sold as a Pair

Convert factory transmission cooler ports to clean, serviceable AN male for braided PTFE AN lines. These adapters use 1/4-18 NPSM straight thread and seal at the case seat/washer (not the threads) for a durable, leak-resistant interface in high-heat ATF service.

What’s included

  • 2 × transmission adapter fittings (pair) — choose AN-6 or AN-8
  • 2 × sealing washers — the washer/seat does the sealing (threads do not)

For 4L70E/4L80E/4L85E: the rear port requires the long/nipple adapter to reach the internal seat. The front port is standard depth. Use the selector above to match your case.

Choose your transmission & case port

Transmission Case Port Thread / Depth AN Male Options Notes
Ford C5 / AOD / AODE / 4R70W 1/4-18 NPSM • standard depth AN-6 or AN-8 Threads do not seal; washer/seat does
Ford E4OD / 4R100 1/4-18 NPSM • standard depth AN-6 or AN-8 Common retrofit to AN lines
GM TH350 / TH400 1/4-18 NPSM • standard depth AN-6 or AN-8 Standard GM case thread
GM 200-4R 1/4-18 NPSM • standard depth AN-6 or AN-8 Common retrofit to AN lines
GM 700R4 / 4L60E / 4L65E 1/4-18 NPSM • standard depth AN-6 or AN-8 Standard-depth front & rear ports
GM 4L70E 1/4-18 NPSM • rear port requires long/nipple AN-6 or AN-8 Front port standard depth; rear uses long/nipple for seat reach
GM 4L80E / 4L85E 1/4-18 NPSM • rear port requires long/nipple AN-6 or AN-8 Rear port is deep/stepped; long nose reaches internal seat
GM Powerglide (select cases) 1/4-18 NPSM or 1/4-18 NPT (case-dependent) AN-6 Verify NPSM vs NPT before ordering
GM 6L80E / 6L90E / 8L90E OE thermostat block retained or replaced AN-6 or AN-8 (via adapter block) Retain OE block or install an AN adapter block

Note: Year/casting can vary. Always verify your port depth and choose the long/nipple option where specified.

  • Direct conversion: thread into the case and transition to AN in one move—no stacks of fittings.
  • PTFE compatible: pairs with Hot Rod AN PTFE hose & ends for ATF heat and chemical resistance.
  • Flow-smart sizing: AN-6 suits most builds; upsize to AN-8 for heavy towing/high-HP cooler circuits.
  • CNC-machined, anodized aluminum: durable finish—use aluminum AN wrenches to protect it.
Install tips:
  1. NPSM ports: sealing occurs at the seat/washer—no thread sealant on NPSM threads.
  2. 4L70E / 4L80E / 4L85E: rear port requires long/nipple; front port is standard depth.
  3. Tighten to seal: snug until the washer contacts, then add ~1/8 turn; re-check after first heat cycle.
  4. Route lines away from headers/exhaust. Use isolator clamps to prevent vibration wear.
  5. PTFE hose tip: wrap the cut area tightly with tape before shearing; remove tape after seating the olive/ferrule. See our install guide.

Important: For transmission cooler circuits. Not for brake or power steering systems.

Specs

Case side 1/4-18 NPSM (straight) — seal at seat/washer
Line side AN-6 or AN-8 male (37° flare)
Includes Sealing washers (2)
Material/finish CNC-machined aluminum, anodized
Primary use Transmission cooler lines (ATF)
Lifetime Warranty Lifetime Warranty on adapter fittings
Fast Shipping Fast Shipping • Free $99+
Expert Support Expert Support

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