LS7 Pilot Bearing
The LS7 pilot bearing (GM 12557583) is a critical component for manual transmission LS applications, supporting the transmission input shaft and ensuring proper alignment between the engine and transmission.
This OEM-style “large pilot bearing” is used in many factory GM manual transmission vehicles and is required for AR5 transmission swaps using FABbot adapter kits.
Using the correct pilot bearing is essential—incorrect or worn bearings can lead to input shaft damage, hard shifting, and premature transmission failure.
What It Does
- Supports the transmission input shaft
- Maintains proper engine-to-transmission alignment
- Reduces vibration and drivetrain wear
- Prevents input shaft and transmission damage
Key Features
OEM GM Pilot Bearing (12557583)
Factory-style pilot bearing used in GM LS manual transmission applications.
Required for AR5 LS Swap Applications
Used with:
- AR5 transmissions (with FABbot adapter kits)
OEM Manual Transmission Fitment
Designed for LS engines paired with manual transmissions such as the T56.
Large Diameter Design
Required for LS crankshafts needing a large pilot bearing.
Prevents Drivetrain Issues
Helps eliminate:
- Hard shifting
- Input shaft wear
- Misalignment-related failures
Technical Specifications
- GM Part Number: 12557583
- Outside Diameter: 1.7" (43.3mm)
- Inside Diameter: 0.59" (15mm)
- Thickness: 0.51" (13mm)
- Style: LS7 / large pilot bearing
- Application: Manual transmission LS setups
Vehicle & Engine Compatibility
Compatible with GM LS engines (Gen III / Gen IV) used in manual transmission applications, including:
- 1997–2004 Corvette (LS1 / LS6)
- 2005–2013 Corvette (LS2 / LS3 / LS7)
- 1998–2002 Camaro / Firebird (LS1)
- 2004–2006 Pontiac GTO (LS1 / LS2)
- 2004–2007 Cadillac CTS-V (LS6 / LS2)
Also required for:
- AR5 transmission swaps using FABbot adapter kits
⚠️ Important:
- Not used with CD009 or EA200 (CD Truck) adapter systems
- Always verify transmission and adapter requirements before ordering
What You’ll Need
Manual Transmission Setup
Required for:
- AR5 LS swaps
- OEM-style T56 manual setups
Clutch & Flywheel Setup
Must be paired with compatible LS flywheel and clutch components.
Perfect For
- AR5 LS swap applications
- OEM LS manual transmission builds
- Replacing worn or missing pilot bearings
- Clutch and transmission installations
- Builders needing proper drivetrain alignment and reliability
Why Choose FABbot
The pilot bearing is a small part with a critical role. This OEM LS7 pilot bearing ensures proper alignment and long-term reliability in both factory and swap applications.
- OEM GM part (12557583)
- Required for AR5 swap setups
- Prevents costly drivetrain damage
- Designed for real-world LS builds
📞 Questions or Want to Check Stock?
Call our sales line at 763-670-6941 — we’re happy to help!
