Chevrolet 10 1971 Series, Chassis Service Manual

Page: 306 / 466

CLUTCHES AND TRANSMISSIONS 7-30
Range can be selected at any vehicle speed, and the
transmission will shift to second gear and remain
in second until the vehicle speed or the throttle are
changed to obtain first gear operation in the same
manner as in D Range.
L I. - LI Range can be selected at any vehicle speed,
and the transmission will shift to second gear and
remain in second until vehicle is reduced to ap­
proximately 40 MPH, depending on axle ratio.
LI Range position prevents the transmission from
shifting out of first gear.
It is very important that any communication concerning
the Turbo Hydra-Matic 400 always contain the transmis­
sion serial and vehicle identification number and that all
transmission parts returned to Chevrolet Motor Division
always be tagged with the transmission serial number.
M AINTENANCE A N D ADJUSTMENTS
T R A N SM ISSIO N FLUID
Transmission fluid level should be checked with trans­
mission warm and selector lever in " P ” Park position
every time engine oil level is checked or as specified in
Section 0 when engine oil is changed.
CAUTION:
Since the Turbo Hydra-Matic 400
transmission is very sensitive to oil level,
special precautions should be taken when check­
ing the oil level, to insure against an overfill.
Transmission fluid should be changed as specified in
Section 0.
Fluid Checking Procedure
Transmission at O p e ratin g Temperature
With the transmission hot (after vehicle has been driven
at least 15 miles), the fluid level should be between the
"FU LL” mark and 1/4 inch below FULL. The vehicle
should be level with the engine idling and the trans­
mission in PARK.
Transmission at Room Temperature (80°F)
If the vehicle has not been driven sufficiently to bring
the transmission up to operating temperature, the fluid
level should be checked as follows:
1. Apply the parking brake, put the selector lever in
PARK, and start the engine. Note: Do Not Race the
Engine. Move the selector lever through each range.
2. Immediately check the fluid level with the selector
lever in the PARK position. The engine should be
running at a slow idle and the vehicle should be level.
The fluid level on the dipstick should be between the
"ADD” mark and 1/4 inch below.
3. If additional fluid is required, add sufficient fluid to
to bring the level to 1/4 inch below the "ADD” mark
on the dipstick.
If the transmission fluid level can be correctly estab­
lished at room temperature (80°F) as described, when
the transmission reaches normal operating temperature,
the fluid level will appear at the "F U L L" mark. The
fluid level is set at 1/4 inch below the "ADD” mark on
the dipstick to allow for expansion of the fluid which oc­
curs as the transmission temperature rises to its normal
operating point of 180°F. DO NOT OVERFILL.
CAUTION:
Do Not Overfill, as foaming and
loss of fluid through the vent pipe might occur
as fluid heats up. If fluid is too low, especially
when Cold, complete loss of drive may result
which can cause transmission failure.
Fig. lT-—Control Linkage (C A 10-20, C A 3 0 ) M odels
396 V8
Adjust kickdown switch (A)
so that actuating lever (B)
rests against threaded barrel
of switch when carb lever is
in wide open throttle position.
CARB LEVER /ACTUATING^
LEVER (B)
VIEW A SWITCH (A)
Fig. 2T— Detent Switch Adjustment— 400 V 8
10-30 CHEVROLET TRUCK SERVICE MANUAL