4L60E/700-R4 Transmission Bushing Kit 14-Piece for GM 1982-Up

GM TH700-R4 / 4L60 / 4L60E / 4L65E / 4L70E — 14-Piece Complete Transmission Bushing Kit | OEM Ref# K77901A | 1982 and Up

This is a complete 14-piece bushing kit designed for the full rebuild of GM's TH700-R4, 4L60, 4L60E, 4L65E, and 4L70E automatic transmissions. OEM Reference Part Number K77901A.

Why Bushings Matter: Worn bushings are one of the most common causes of transmission trouble in high-mileage GM vehicles. When the bushings inside your transmission wear down, rotating components lose their alignment and support, allowing hydraulic pressure to bleed off internally. The result is fluid leaks at the front pump and extension housing, slipping gears, harsh or delayed shifts, clutch wear, and eventually internal component damage. Replacing every bushing position during a rebuild is essential to restoring proper function and long-term durability.

What's Included (14 Pieces):

• Stator Support Bushing, Front (30-spline type)
• Stator Support Bushing, Front (27-spline type)
• Stator Support Bushing, Rear — Standard Length
• Stator Support Bushing, Rear — Extended Length (4L60E)
• Reverse Input Drum Bushing, Front
• Reverse Drum Bushing, Rear
• Front Pump Bushing, Babbitt
• Input Sun Gear Bushings, Front & Rear (Qty. 2)
• Reaction Carrier Shaft Bushing, Front
• Reaction Carrier Shaft Bushing, Rear
• Reaction Sun Gear Bushing, Rear
• Case-to-Output Shaft Bushing, Babbitt
• Extension Housing Bushing, Bronze

Fitment:

• TH700-R4: 1982–1992
• 4L60: 1987–1993
• 4L60E: 1993 and Up
• 4L65E: 2001 and Up
• 4L70E: All Years

Compatible Vehicles Include: Chevrolet C/K Pickup, Silverado, Suburban, Tahoe, Blazer, S-10, Camaro, Corvette, Astro, Colorado, Canyon, Avalanche | GMC Sierra, Jimmy, Envoy, Sonoma, Safari | Cadillac Escalade, Fleetwood | Buick Roadmaster, Rainier | Pontiac Firebird, Trans Am | Hummer H3 | And more GM vehicles equipped with the listed transmissions, 1982 and up.

Note: Professional installation required. Transmission removal, disassembly, and reassembly are necessary for installation. Verify your transmission model prior to ordering.