Chevrolet 10 series 1973, Overhaul Manual

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A U T O M A T IC T R A N S M IS S IO N 7A-21
30. Install new suction screen and gasket.
31. Install the guide plate (fig. 34PG) making sure that
the inner lever properly picks up the manual valve.
Install attaching bolts.
32. Install the vacuum modulator valve and the vacuum
modulator and gasket.
33. Install the oil pan, using a new gasket, and the oil
pan attaching bolts.
34. Install converter and Safety Holding Strap J-9549
or a suitable substitute.
LOW BAND ADJUSTM ENT
1. Remove protective cap from adjusting screw.
2. Loosen adjusting screw locknut 1/4 turn.
3. While holding locknut, tighten low band adjusting
screw to 70 inch lbs. using wrench, J-5853 and a
7/32" hex head driver (fig. 35PG) or J-21848. The
input and output shaft must be rotated simulta­
neously to properly center the low band on the
clutch drum.
4. Then back off four (4) complete turns for a band
which has been in use for 6,000 miles or more, or 3
turns for one in use less than 6,000 miles.
5. Tighten the locknut to specified torque and install
protective cap.
CAUTION: The amount of back-off is not an
approximate figure, it must be exact.
THROTTLE VALVE ADJUSTM ENT
No provision is made for checking TV pressures.
However, if operation of the transmission is such that
some adjustment of the TV is indicated, pressures may
be raised or lowered by adjusting the position of the jam
nut on the throttle valve assembly (fig. 36PG). To raise
TV pressure 3 psi, backoff the jam nut one (1) full turn.
This increases the dimension from the iam nut to the
throttle valve assembly stop. Conversely, tightening the
Fig. 35PG--Low Band Adjustment
jam nut one (1) full turn lowers TV pressure 3 psi. A
difference of 3 psi on TV pressure will cause a change of
approximately 2 to 3 MPH in the wide open throttle
upshift point. Smaller pressure adjustments can be made
by partial turns of the jam nut. The end of TV, adjusting
screw has an alien head so the screw may be held
stationary while the jam nut is moved.
NOTE: Use care when making this adjust­
ment since no pressure tap is provided to
check TV pressure.
TV ADJUSTMENT ALLEN W RENCH
NUT
Fig. 3 4 P G -ln s ta llin g D etent Guide Plate
Fig. 36PG -TV A d ju stm e n t N ut
OVERHAUL MANUAL