S10/T10 P/U 4WD V6-262 4.3L VIN Z (1992)
Accumulator: All Technical Service Bulletins
A/T - Harsh 1-2 Upshift, May Require Cold Soak
Number: 92-318-7A
Section: 7A
Date: NOV. 1992
Corporate Bulletin No.: 277135R
ASE No.: A2
Subject:
HARSH 1-2 UPSHIFT
Model and Year:
1992 CAPRICE, CAMARO AND CORVETTE
1992 C/K, G, L/M, S/T TRUCKS
TRANSMISSION APPLICATIONS:
1992 HYDRA-MATIC 4L60
TRANSMISSION MODELS:
2AAM, 2ACM, 2ADM, 2AKM, 2BAM, 2BBM, 2BCM, 2BHM, 2BRM, 2BWM, 2CAM, 2CBM, 2CCM, 2CFM, 2CHM, 2CJM, 2CPM, 2FTM, 2FUM,
2FZM, 2HBM, 2HDM, 2HLM, 2KHM, 2KJM, 2KMM, 2LHM, 2MDM, 2MJM, 2MSM, 2SHM, 2TAM, 2TBM, 2TLM, 2TWM, 2WAM, 2WBM,
2WCM, 2YAM, 2YCM
SUBJECT:
Harsh 1-2 Upshift; Install Service Package
VEHICLE APPLICATIONS:
B, F, Y Cars C/K, S/T Trucks G, L, M Vans
CONDITION (Figure 1):
Some vehicles equipped with a 1992 HYDRA-MATIC 4L60 transmission built between Julian Date 061 (March 1, 1992) and Julian Date 171 (June 19,
1992) may experience a harsh 1-2 upshift.
NOTE:
Once the transmission is brought to operating temperature, the condition may not be able to be reproduced until a "cold soak" (overnight) is performed.
CAUSE:
The above condition may be caused due to a tapered 1-2 accumulator sleeve. The tapered bore may cause the 1-2 accumulator valve to stick in the
bottom of the bore.