Chevrolet Silverado Classic 2007 Owner's Manual page 501

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.
Then, follow these steps:
5-speed for VORTEC™ 4300 V6 and 4800 V8 engines
shown, other manual transmissions similar
1. Remove the filler plug.
2. Check that the lubricant level is up to the
bottom of the filler plug hole.
3. If the fluid level is good, install the plug and
be sure it is fully seated. If the fluid level is
low, add more fluid as described in the
next steps.
How to Add Manual Transmission Fluid
Here is how to add fluid. Refer to the Maintenance
Schedule to determine what kind of fluid to
use. See Recommended Fluids and Lubricants on
page 630.
1. Remove the filler plug.
2. Add fluid at the filler plug hole. Add only
enough fluid to bring the fluid level up to
the bottom of the filler plug hole.
3. Install the filler plug. Be sure the plug is
fully seated.
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