Suburban 3/4 Ton 4WD V8-305 5.0L (1986)
FIGURE 2 - THM 400/700-R4 TRANSMISSION IDENTIFICATION INFORMATION
DATE OF PRODUCTION CHANGE:
(Figure No. 2)
Beginning December 11, 1987 (Julian Date 345) all THM 400/475 transmissions were produced with the new governor driven gear. Beginning July 6,
1987 (Julian Date 187) all THM 700-R4 transmissions were produced with the new governor driven gear.
SERVICE ACTION:
When servicing any THM 400/475 governor driven gear, use the new governor driven gear and pin package listed under "Service Parts Information".
When servicing any THM 700-R4 governor driven gear for an "applecored" condition, use the new governor driven gear and pin package listed under
"Service Parts Information". NOTE: The new THM 700-R4 governor gear is green in color (the previous gear was blue.) This can be used as another
method of identification. When servicing any 1982 through 1986 THM 700-R4 govemor driven gear for conditions other than applecoring, the previous
governor driven gear, package number 8642928, should be used until current service stock is depleted.
SERVICE PARTS INFORMATION:
Part No.
Description
8663995
THM 700-R4 - Governor Drive Gear
and Pin Package
8629977
THM 400 - Govemor Drive Gear and
Pin Package
SERVICE MANUAL REFERENCE:
Refer to the appropriate 1988 Unit Repair Service Manual sections for removal and installation procedures not covered in this bulletin.
Labor Op:
K6430 - Governor Assembly - R&R or Replace
Labor Time:
.8 hrs - All Models
