Chevrolet 1977 light duty truck Service Manual page 12

• If it feels hot (cannot be held comfortably), the
level should be between the
Drain Intervals
The transmission operating temperature resulting
from the type o f driving conditions under which your
vehicle is used is the m ain consideration in establishing
the proper frequency of transmission fluid changes.
C hange the transmission
15,000 miles (12,000 miles
Vehicles), if the vehicle is usually driven under one or
more of the following conditions which are considered
severe transmission service:
• In heavy city traffic.
• W here the outside tem perature regularly reaches
90 °F.
• In very hilly or m ountainous areas.
• Frequent trailer pulling.
• Commercial uses, such as taxi, police car or
delivery service.
If you do not use your vehicle under any o f these
conditions, change the fluid and filter every 60,000 miles,
(24,000 miles Heavy Duty Emission Vehicles).
T o C h a n g e T urbo
remove fluid from the transm is­
H y d r a -M a tic 3 5 0 fluid ,
sion sump, add approximately 7.5 pints U.S. measure
(6.25 pints Imperial measure) for the T urbo Hydra-M atic
400 and 2-1/2 qts. U.S.
measure) for the Turbo Hydra-M atic 350 o f fresh fluid,
to return level to proper mark on the dipstick.
Every 6 0 ,0 0 0 M ile s
the T u rbo H ydra-M atic 400 trans­
E m ission V e h ic le s )-
mission sum p filter should be replaced.
3-A N D 4-SPEED M A N U A L T R A N M IS S IO N
Lubricant
Every 12 months or 7,500 miles (4 months or 6.000
miles Heavy Duty Emission Vehicles), whichever occurs
first, check lubricant level
necessary, to fill to level o f filler plug hole with SAE 80W
or SAE 80W-90 GL-5 G e a r Lubricant. If temperatures
below + 3 2 ' F are expected, use SAE 80W GL-5 G e a r
L ubricant only. For those vehicles normally operated in
C a na da , use SAE 80W GL-5 G e a r Lubricant only.
T R A N S M IS S IO N S H IF T LINKAG E
(M A N U A L AN D A U T O M A T IC )
Every 7,500 miles or 12 months (6,000 miles or 4
months Heavy Duty Emission Vehicles), lubricate shift
linkage and, on M anual transmission floor control, lever
contacting faces with w ater resistant EP chassis lubricant
which meets G eneral Motors Specification GM6031-M.
Clutch
The clutch pedal free travel should be checked at
regular intervals.
Lubricate the clutch cross-shaft at fitting (on Series
10 Forward Control models also lubricate the clutch
and marks.
A D D FU LL
fluid and filter every
Heavy Duty Emission
H y d ra -M a tic 4 0 0 and Turbo
measure (2 qts. Imperial
( 2 4 ,0 0 0 m iles H e av y Duty
and add lubricant,
linkage idler lever at fitting) every 7,500 miles or 12
months (6,000 miles or 4 months Heavy Duty Emission
Vehicles) with water resistant EP chassis lubricant which
meets G eneral Motors Specification G M 6 0 3 l-M.
REAR AXLES
S tan d ard
Every 12 months or 7,500 miles (4 months or 6,000
miles Heavy Duty Emission Vehicles), whichever occurs
first, check lubricant
necessary, to fill to level o f filler plug hole. Use SAE 80W
or SAE 80W-90 GL-5 G e a r Lubricant. For those vehicles
normally operated in Canada, use SAE 80W GL-5 G ear
Lubricant.
Positive Locking or Positraction
Every 12 months or 7,500 miles (4 months or 6,000
miles Heavy Duty Emission Vehicles), whichever occurs
first, check lubricant level and add SAE 80W or SAE
80W-90 GL5 gear lubricant, if necessary, to fill to level
of filler plug hole.
PROPELLER SHAFT SLIP JO IN T S
Propeller shaft slip joints should be lubricated every 7,500
miles or 12 months (6,000 miles or 4 months Heavy Duty Emis­
sion Vehicles) with water resistant EP chassis lubricant which
meets General Motors Specification GM 603l-M.
UNIV E R S A L JO IN T S
All universal joints are the needle bearing type.
Lubricate those universal joints (depending on truck
model) equipped with lube fittings every 7,500 miles or
12 months (6,000 miles or 4 months
if
Emission Vehicles) with water
lubricant which meets G eneral Motors Specification G M
60 3 l-M. More frequent lubes may be required on heavy
duty or "O ff the R o a d " operations.
WHEEL BEARINGS
Fro nt
NOTE: Use wheel bearing lubricant G M Part No.
1051344 or equivalent
ments o f G eneral Motors Specification G M 6031 -
M.
Due to the weight of the tire and wheel assembly it
is recom m ended that they be removed from hub before
lubricating bearings to prevent dam age to oil seal. Then
remove the front wheel hub to lubricate the bearings.
The bearings should
repacking with lubricant.
Front wheels are equipped with
level and add lubricant,
Heavy Duty
resistant EP chassis
which meets all require­
be thoroughly cleaned before
tapered
if
roller