Manual Transmission Fluid - GMC T-Series 2007 Owner's Manual

Manual Transmission Fluid

When to Check
A good time to have it checked is when the
engine oil is checked. Refer to the Maintenance
Schedule to find out when to check and change
your manual transmission fluid. See Scheduled
Maintenance on page 295.
How to Check and What to Use
Check the fluid level only when your engine is off,
the vehicle is parked on a level place, and the
transmission is cool enough for you to rest
your fingers on the transmission case.
214
To check the transmission fluid level, do the
following:
1. Remove the filler plug.
2. Check to be sure that the lubricant level is up
to the bottom of the fill opening. On heavy
duty transmissions, an inch of oil level equals
about one gallon of fluid.
3. If the fluid level is good, reinstall the plug
and be sure it is fully seated. If the fluid
level is low, add more fluid as described in
the next steps. Refer to the Maintenance
Schedule to determine what kind of fluid to
use. See Part C: Recommended Fluids
and Lubricants on page 321.