4L60E GM Automatic Transmission – OEM+ Performance (425 HP Rated)
2-Piece Case • 1998–2005 Applications
In-Stock & Ready to Ship
NO TORQUE CONVERTER INCLUDED
1-Year Parts-Only Warranty
This OEM+ performance 4L60E transmission is a budget-conscious upgrade
designed for daily-driven vehicles and mildly modified street applications
that require increased durability over a standard stock replacement.
Rated for up to 425 horsepower, this build corrects known factory weak points
while maintaining smooth, predictable shift quality for everyday street use —
without the added cost of a torque converter.
All listed transmission components are brand new unless stated otherwise.
INTERNAL COMPONENT UPGRADES
- High-Energy Performance Clutch Packs – Improved heat resistance and holding power over OEM
- Kevlar Intermediate Band – Increased durability vs. factory band material
- HD Updated Sun Shell – Corrects common OEM spline failure
- OEM-Spec Heavy-Duty Bushing Kit
- Heavy-Duty Sprag Assembly
SERVO & APPLY SYSTEM UPGRADES
- Corvette 2nd Apply Servo – Increased band apply force for improved 1–2 shift durability
- Updated Servo Pin & Apply Components – Corrects common wear and release issues
PUMP & VALVE BODY – MODIFIED & UPDATED
-
Updated Oil Pump Assembly
- Corrected lubrication and pressure circuits
- Updated internal clearances
- All factory reliability updates installed
-
Recalibrated Valve Body – OEM+ Street Calibration
- Improved clutch and band apply pressure
- Smoother, more consistent shift timing
- Street-friendly calibration for daily driving
HYDRAULIC & ELECTRONIC COMPONENTS
- .500" Boost Valve & Sleeve – Improved line pressure under load
- New EPC solenoid
- New shift solenoids
- New pressure control manifold
SUPPORTING COMPONENTS
- Precision gasket and seal kit
- New transmission filter
- Final assembly inspection and air-check verification
APPLICATION NOTES
- Fits GM vehicles equipped with 4L60E
- 1998–2005 model years
- Daily drivers and mild performance street vehicles
No core charge required.
IMPORTANT WARRANTY NOTICE
This transmission includes a 1-year parts-only warranty.
Adding a torque converter does NOT extend the warranty.
Vehicles used for racing, heavy towing, abuse, or exceeding the
425 HP rating require a higher-capacity transmission.
Technical assistance available toll-free: 855-588-1543
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