Automatic Transmission - Chevrolet 1956 Truck Operator's Manual

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For best results the lubricant in Tandem Axle Power
Divider units should be changed seasonally as recommended
in previous paragraph.
AUTOMATIC TRANSMISSION
Every 1,000 miles the fluid level should be checked and
fluid added as described below when
necessary.
Use only
"Automatic Transmission Fluid Type A" bearing an AQ-ATF
number. This fluid is available in sealed containers at all
Authorized Chevrolet Dealers and oil company service sta-
tions. A good grade of lOW engine oil may be used temporarily
in emergencies but should be replaced with Automatic Trans-
mission Fluid as soon as possible.
Every 25,000 miles for Hydra-Matic and every 15,000 miles
for Powermatic the transmission fluid should be drained and
refilled as described
herein.
CHECKING HYDRA-MATIC FLUID. Check transmission
fluid level with transmission at normal operating temperature.
Otherwise, the engine and transmission must be warmed to
operating temperature. Engine must be running while check-
ing or adding fluid.
1. Set parking brake and move control lever into (N) posi-
tion; then start engine. Run engine at idling speed until
Fig. 80-Checking Hydra-Matic
Transmission Fluid Level
engine and transmission have
reached normal operating
temperature.
2. Lift access hole cover
plate on floor pan (fig. 80) to
give access to oil breather
and level indicator assembly.
3.
Remove all dirt or
gravel from area around indi-
cator and transmission case.
With engine still idling, re-
move indicator from case.
Wipe clean, re-insert, and
carefully withdraw again.
Exercise extreme care to prevent dirt from entering filler tube
when checking fluid level. Add fluid (Step 4) only when level
• 79·

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