GMC Sierra 1999, Owner'S Manual

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Manual Transmission Check
Check the transmission fluid level; add if needed.
See “Manual Transmission Fluid” in the Index. Check
for leaks. A fluid loss may indicate a problem. Have the
system inspected and repaired if needed.
Automatic Transmission Check
Check the transmission fluid level; add if needed.
See “Automatic Transmission Fluid” in the Index. A
fluid loss may indicate a problem. Check the system and
repair if needed.
Hydraulic Clutch System Check
Check the fluid level in the clutch reservoir. See
“Hydraulic Clutch Fluid” in the Index. A fluid loss in
this system could indicate a problem. Have the system
inspected and repaired at once.
At Least Once a Year
Key Lock Cylinders Service
Lubricate the key lock cylinders with the lubricant
specified in Part D.
Body Lubrication Service
Lubricate all body hood hinges, hood latch assembly,
secondary latch, pivots, spring anchor, release pawl,
tailgate hinge, tailgate linkage, tailgate handle pivot
points, latch bolt, fuel door hinge, locks and folding seat
hardware. Part D tells you what to use. More frequent
lubrication may be required when exposed to a
corrosive environment.