GMC 1999 Sierra 1500 Pickup Owner's Manual page 314

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Senrice & Appearance Care
Manual Transmission Huld
When to Check:
the fluid in your manual transmission doesn't require changing.
How
to 'Check:
Because this operation can be a :little difficult, you may choose to have this
done at your dealership Service Department.
t
A good time to have it checked is when .the engine oil is changed. However,
If you do it yourself, be sure to follow' all the instructions here, or you could
get a false reading..
. . . . . . . . .
-
Too much
or
too little fluid can damage your transmission. Too much can
mean that some of the fluid could come out and fall on hot engine parts,
starting a fire. Be sure to get an accurate reading if you check your
transmission fluid.
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:.
~ ~~ ~
1.
Remove the filler plug.
K2471
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.
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