Suburban 3/4 Ton 4WD V8-305 5.0L (1986)
Clutch: All Technical Service Bulletins
A/T - 4L60, Revised Sprag/Forward Clutch Hub
INFORMATION
Bulletin No.: 08-07-30-017
Date: April 04, 2008
Subject:
4L60 Automatic Transmission - New Sprag Assembly Forward Clutch to Overrun Clutch Hub
Models:
1982-1986 Passenger Cars and Light Duty Trucks
with 4L60 Hydra-Matic Transmission (RPO MD8)
The notches above each sprag must point up as shown when assembled into the outer race.
Bearing Assembly, Input Sun Gear
Snap Ring, Overrun Clutch Hub Retaining
Hub, Overrun Clutch
Wear Plate, Sprag Assembly
Retainer and Race Assembly, Sprag
Forward Sprag Assembly
Retainer Rings, Sprag Assembly
Outer Race, Forward Clutch
Washer, Thrust (Input Carrier to Race)
The New Forward Clutch Assembly Changes are as Follows:
^
Two more Sprag Elements (28 total)
^
Larger Inner and Outer Race Diameters
^
Solid Steel End Retainer Rings
The new design sprag can be used on models 1982 through 1986, by replacing the entire assembly (637 - 644). Individual components are NOT
inter-changeable.
Important:
The wear plate (640) and input thrust washer (660) are not required with the new sprag. Use of the thrust washer and wear plate with the new sprag
assembly will cause a misbuild (correct end play cannot be obtained).
