4L80E Overdrive Planetary (Early)
This overdrive planetary assembly is redesigned with a billet steel drive plate to eliminate spline/housing failure in high horsepower and extreme applications.

• Fits 1991-2001. Can be used in 2001 and up with .306 Roller and housing assembly.
• Top Hat is made from 4140 HTSR billet steel and is contoured to the planetary housing to eliminate any possibility of separation under load.
• 100% drop-in product.
• No core exchange required.
• Sprag for the early (1991-01)design shown below: