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Hays Pilot Bearing - Roller Type

For LS/LT engines using a Large Outer Pilot Bearing

Part # 50379
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This Hays Roller Pilot Bearing is an easy to install upgrade or replacement for LS or Gen V LT engine with a TKO or TKX transmission. Roller pilot bearings reduce parasitic drag that can cause transmission wear and hard shifting. Pre-greased and ready for installation.


  • Large outer pilot bearing commonly used for LS and Gen V LT engines with TKO/TKX transmission swaps
  • Double sealed bearing can be installed in either direction
  • Roller bearing design for improved transmission alignment and shifting
  • Pre-greased and ready to install

About Hays

Hays offers complete clutch kits and torque converters for an infinite number of high-performance applications, pressure plates for precise gear changes, clutch discs for smooth, chatter-free engagement, and flywheels and flexplates ideal for today's vehicles.

Depth (in).700
Emission Code5
EngineGM Small Block Gen III/IV (LS Based)
GM Small Block Gen V (LT Based)
Inside Diameter (in).600
Outside Diameter (in)1.705
Product TypePilot Bearings/Bushings
Part Number50379

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.

Drive the bearing flush with the crankshaft outer flange. Do not force the install, once installed the bearing should turn smoothly. IMPORTANT NOTE: many GM LS engines use a press-in oil plug deep inside the crankshaft flange. DO NOT move or disturb this plug when removing or installing a pilot bearing. Your old pilot bearing must be removed by means of a mechanical pilot bearing puller. DO NOT attempt to use a "hydraulic" method to push-out or remove your old pilot bearing!

*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.