G 2500 3/4 Ton Van V6-262 4.3L VIN Z (1992)
Automatic Transmission Dipstick - Dipstick Tube: All Technical Service Bulletins
A/T - New Fluid Level Indicators & Fluid Check Procedure
GMC NUMBER: 92-7A-81
GROUP: 7A Automatic Transmission
DATE: April 1992
CORPORATE
NUMBER: 277117
SUBJECT:
NEW FLUID LEVEL INDICATORS AND FLUID CHECK PROCEDURE
MODELS:
1991-92 C/K, R/V, S/T, P TRUCKS AND G, M/L VANS
New Fluid Level Indicators:
During the 1991 and 1992 Model Years, changes were made to the fluid level indicators (dipsticks) in most HYDRA-MATIC 4L60 and all
HYDRA-MATIC 4L80-E transmissions.
The new fluid level indicators (all except 91 S/T trucks, G and M/L vans with 4L60) have a cold fill area that is located lower on the stick than the
previous fluid level indicators. The area was moved in response to a fluid level study which showed the previous markings did not reflect current hot
fluid expansion rates.
The cold area on the fluid level indicator may still have two holes (dimples) to mark it, or may now be a solid area that says "COLD". See figure 1 to
identify which indicators have dimples to mark the cold area and which have been changed to say "COLD".
When dealer prep personnel check transmission fluid levels in these vehicles, it is important to know the temperature of the transmission fluid before
determining that fluid needs to be added. The dipstick "hot" and "cold" markings are calibrated to correspond to the following temperatures:
HOT
180-200 degrees F (82-94 degrees C)
COLD
75-85 degrees F (24-29 degrees C)
