Suburban 3/4 Ton 4WD V8-305 5.0L (1986)
Synchronizer Ring: All Technical Service Bulletins
M/T - 3RD Gear Hop-Out on Acceleration or Deceleration
GMC NUMBER:
86-T-156
GROUP:
7B - Manual Transmission
DATE:
March, 1988
CORPORATE
NUMBER:
677202R
SUBJECT:
3RD GEAR HOP-OUT (LABELED 2ND GEAR ON THE GEAR SHIFT KNOB)
MODELS:
1985-86 C/K, R/V, P MODELS WITH HM 117 (RPO M20) OR CH/SM 465 (RPO MC8) MANUAL TRANSMISSION
BULLETIN COVERS
Above vehicles may exhibit 3rd gear hop-out on acceleration or deceleration.
DATE OF PRODUCTION CHANGE
December 15, 1987 (Julian Date T15)
SERVICE ACTION
If 3rd gear hop-out occurs, it can be repaired by installing the service part package listed below.
SERVICE PARTS INFORMATION
P/N 8672944 Service Part Package contents:
Quantity Part Description
1
3rd Speed Gear
1
3rd-4th Synchronizer Hub
1
3rd-4th Speed Synchronizer Sleeve
2
3rd and 4th Speed Blocker Rings
3
Synchronizer Keys
2
Synchronizer Springs
SERVICE NOTE
Refill the transmission with only SAE 80W-90 gear lubricant. Do not use automatic transmission fluid or engine oil, which can cause foaming out the
vent and durability concerns.
SERVICE MANUAL REFERENCE
Refer to the Unit-Repair Section of the appropriate Service Manual for service procedures.
LABOR OPERATION:
K2700 Transmission Assembly - R & R Transmission, recondition mainshaft.
1988
1985-86
1987-88
1985-88
C
K
C
K
R
C
P
2.8
3.5
3.6
4.1 3.6
4.1
3.6
