K 1500 1/2 Ton Pickup 4WD L6-250 4.1L VIN D 2-bbl (1982)
Clutch: All Technical Service Bulletins
A/T Forward Sprag Clutch - Revised
Number:
83-T-79
Section:
VIIc
Date:
September, 1983
Subject:
SERVICE INFORMATION FOR THE FORWARD SPRAG CLUTCH - ALL THM 700-R4
TO:
ALL CHEVROLET DEALERS
Beginning May 3, 1982, a new forward sprag clutch entered production replacing the forward roller clutch on all THM 700-R4 transmissions.
To minimize the number of service parts required in inventory, only the new forward sprag clutch parts are serviced as follows:
FIGURE 1 - CLUTCH
A.
If any of the following parts require replacement on a transmission built with a roller clutch, order service package 8642947. (See Figure 1)
Hub, Overrun Clutch (ILL. No. 2)
Race, Forward Clutch-Outer (5)
Cam, Forward Roller (3)
Gear, Input Sun (6)
Roller Asm., Forward Clutch (4)
Carrier Asm., Input-Complete (8)
NOTICE:
Overrun Clutch Hub Retaining Snap Ring (ILL. No. 1) and Input Carrier to Race Thrust Washer (7) still available individually
for service. (See B. below)
Service package 8642947 is a sprag conversion kit which contains the following parts: (See Figure 1)
Snap Ring, Overrun Clutch Hub
Race, Forward Clutch-Outer (644)
Retaining (ILL. No. 638)
Gear, Input Sun (658)
Hub, Overrun Clutch (639)
Washer, Thrust (Input Carrier to
Wear Plate, Sprag Asm. (640)
Race) (660)
Retainer & Race Asm., Sprag (641)
Carrier Asm., Input-Complete (662)
Forward Sprag Asm. (642)
Instruction Sheet
B.
The following individual part numbers can be used to service all transmissions which either were built with a forward sprag clutch after May 3,
1982, or have been converted with service package 8642947.
(a)
8647083 - Snap Ring, Overrun Clutch Hub Retaining (ILL. No. 638)
(b)
8647082 - Hub, Overrun Clutch (639)
(c)
8647081 - Wear Plate, Sprag Asm. (640)
(d)
8647085 - Retainer & Race Assembly (641)
(e)
8647084 - Forward Sprag Assembly (642)
(f)
8647090 - Race, Forward Clutch - Outer (644)
(g)
8647093 - Gear, Input Sun (658)
(h)
8647095 - Washer, Thrust (Input Carrier to Race) (660)
(i)
8647050 - Carrier Assembly, Input - Complete (662)
Service Information
1.
Use the following procedure to assemble the forward sprag clutch:
(a)
Place the forward clutch outer race (644) on table with the recessed face down.