LS641001ERL - Earl's LS641001ERL Clutch Adapter Fitting - Early Image

Earl's LS641001ERL Clutch Adapter Fitting - Early

-4 AN Male to OEM GM/Jeep/Mopar Master Cylinder & Clutch Release Bearings


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Estimated shipping date: 11/12/2021
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The clutch system on most late-model vehicles use a plastic clutch hose that is tough to modify when doing an engine swap. The OEM plastic hose can expand and many not work correctly in high heat, high pressure, or with a racing clutch. These special stainless steel adapter fittings works with most late-model master cylinders, hydraulic clutch release bearings, and slave cylinders. The plastic OEM hose is eliminated and replaced with PTFE lined AN -4 hose (use Earls Speed-Flex hose). Use (2) adapters when using both the OEM master cylinder and hydraulic release bearing (or slave cylinder). Use (1) adapter for custom clutch plumbing systems that use either OEM master cylinder or OEM clutch release bearing (or slave cylinder). Check your OEM hose and choose an Early or Late style adapter. Sold Individually.

Fits: Most 2009 & Prior GM Vehicles with Plastic Clutch Hose, and Most 2006 & Prior Jeep / Mopar Vehicles with Plastic Clutch Hose (also fits many other vehicles).


  • Adapter Converts OEM Master Cylinders, Clutch Release Bearings & Slave Cylinders to use AN 4 PTFE Lined Hose
  • Fits: Late Model GM LS T56 (and many Jeep/Dodge) Clutch Master Cylinders, Slave Cylinders & Hydraulic Release Bearings
  • Allows Replacement of the OEM Plastic Clutch Hose â€" Use w/ HP Clutches, Racing & High Heat Applications
  • Improved Pedal Feel w/ Braided Stainless Steel PTFE Clutch Hose (Speed Flex/Speed Seal â€" Instead of Plastic Hose)
  • Ideal for Engine Swaps & Vehicles That Use After-Market Master Cylinders w/ the OEM Clutch Release Bearing
  • Use w/ Earls AN -4 Speed-Seal/Speed-Flex Hose â€" or Premade Speed-Flex PTFE Lined Hose
  • Material: 304 Stainless Steel
  • EPDM X-Profile O-Ring
  • Fitting is Retained by Split-Pin

Product Attributes

Brand Earl's
Emission Code5
Manufacturer Part NumberLS641001ERL
Product TypeClutch Adapter Fittings
Part NumberLS641001ERL



This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

Tech Resources

Use w/ AN 4 PTFE Lined Hose Suitable for High Pressure Applications (i.e. Earls Speed Flex or Similar Hose).
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    Some parts are not legal for use in California or other states with similar regulations.