Chevrolet LIGHT DUTY TRUCK (SERIES 10-35) Service Manual page 12

Rear Axle (Standard) Lubricant
Check lubricant level. Add lubricant, if necessary, to
fill to level of filler plug hole. Use SAE 80W GL-5 or SAE
80W-90 GL-5 or GM 1052271/1052272 gear lubricant. For
those vehicles driven in Canada, use SAE 80W GL-5 gear
lubricant.
Rear Axle (Limited-Slip) Lubricant
Check lubricant level. Add lubricant, if necessary, to
fill to level of filler plug hole. Use gear lubricant GM
1052271/1052272 or equivalent.
Automatic Transmission Fluid
Use only automatic
D E X R O N ® II or equivalent.
Check the automatic transmission fluid level at each
engine oil change period. Overfilling can cause foaming and
loss of fluid. Transmission damage can result. Low fluid
level can cause slipping or loss of drive.
Automatic transmissions are often overfilled because
the fluid level is checked when the fluid is cold. When cold,
the dipstick shows that fluid should be added. However, the
low reading is normal, the level will rise as the fluid gets
warm. The fluid level will increase more than 3/4 inch
(19mm) as fluid warms up from 60°F to 180°F (16°C to
82°C).
Check the transmission fluid level with the engine
running, the shift lever in "Park", and the vehicle level.
If the vehicle has just been driven for a long
NOTICE:
time at high speed or in city traffic in hot weather, or
if the vehicle has been pulling a trailer, the correct fluid
level cannot be read. Wait until the fluid has cooled
down (about 30 minutes).
Remove the dipstick. Carefully touch the wet end of
the dipstick to find out if the fluid is cool, warm or hot. Wipe
it clean and push it back in until cap seats. Pull out the
transmission fluid labeled
MAINTENANCE AND LUBRICATION
dipstick and read the fluid level (fig. OB-4).
• If it felt cool, about room temperature, the level
should be 1/8 to 3/8 inch (3 to 10mm) below the "Add"
mark. The dipstick has two dimples below the "Add" mark
to show this range.
• If it felt warm, the level should be close to the "Add"
mark (either above or below).
• If it was too hot to hold, the level should be at the
"Full" mark.
DO NOT OVERFILL it takes only one pint
NOTICE:
(0.5 litre) to raise level from "Add" to "Full" with a
hot transmission.
Manual Transmission Lubricant
Check lubricant level. Add lubricant, if necessary, to
fill to level of filler plug hole.
Use SAE 80W GL-5 or SAE 80W-90 GL-5 gear
lubricant. For those vehicles driven in Canada, use SAE
80W GL-5 gear lubricant.
Windshield Washer Fluid
(Also a S a fe ty Service)
Fill the washer jar only 3/4 full during the winter to
allow for expansion if the temperature should fall low
enough to freeze the solution.
• Check the washer fluid level regularly-do it often
when the weather is bad.
• Use a fluid such as GM Optikleen or equivalent to
help prevent freezing damage, and for better cleaning.
• Do not use radiator antifreeze in the windshield
washer; it could cause paint damage.
• In cold weather, warm the windshield with
the defrosters before using the washer--to help
prevent icing that may block the driver's vision.
Cooling System Care
Do not remove radiator cap to check coolant level.
Instead, check by looking at the "see through" coolant
recovery tank. Level should be at the "Full Cold" mark on
the recovery tank when the system is cold; and at the "Full
Hot" mark during engine operation. Add a 50/50 mixture
of a good quality ethylene glycol antifreeze and water to the
recovery tank when more coolant is needed. If frequent
additions are needed, cooling system.
If the proper quality antifreeze is used, there
NOTICE:
is no need to add extra inhibitors or additives that claim
to improve the system. They may be harmful to the
proper operation of the system, and are an unnecessary
expense.
OB-5
LIGHT DUTY TRU CK SER V ICE MANUAL