Hays Crankshaft Adapter Sleeve – Small Block Ford to GM Automatic Transmission

Adapts Small Block Ford 1.375" Crankshaft Pilot to Early GM Torque Converter Pilot

PART# 41-200

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Hays crankshaft adapter sleeves allow you to bolt a GM automatic transmission to a Ford engine or an older GM automatic transmission to an LS-series engine. These adapter sleeves insert into the crankshaft flange with no modifications to give you the correct distance and pilot size to use a torque converter of the transmission type being installed. Use of this adapter keeps from possibly damaging the input shaft of your transmission when doing a transmission swap. These are manufactured from precision CNC-machined top quality steel.


  • Versions available to adapt Ford engine to GM transmission or LS engine to older GM transmission
  • CNC machined for a precise fit
  • Made from high quality steel
  • Adapts crankshaft pilot to torque converter snout
  • Gives added spacing between engine block and flexplate


Crank Pilot Diameter1.375
Emission Code5
Engine ApplicationFord
Flexplate ApplicationGM
Inside Diameter1.025
Outside Diameter 11.375
Outside Diameter 22.00
Product TypeCrankshaft Adapter
Transmission Use4L60E
Warranty90 Day
Part Number41-200



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.

Warranty Information

90 Day: See Details
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      *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

      Some parts are not legal for use in California or other states with similar regulations.

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