Chevrolet 1977 10 Series, Repair Manual, Page: 275 / 468

AUTOMATIC TRANSMISSION (200)7A-39
Fig. 7A-1 53 A --R e m o v in g S h if t T. V. Plug
Fig. 7A-1 5 4 A - R e m o v i n g S h if t T.V. Plug
bushing. Install these 3 parts, valve end first, into the bore,
aligning bushing so the pin can be installed in the pin slot.
(See Fig. 7A-156A for pin slot and identification of 1-2
throttle valve bushing.)
10. In next bore up, install 2-3 shift valve, longer stem
end out, making sure valve is seated at the bottom of the
Fig. 7A-1 55 A -Rem ovin g Inner Coiled Retaining Pin
PIN SLOT IDENTIFICATION
Fig. 7 A - 1 5 6 A —I nsta 11 1-2 T h r o t t le Valve Bu s h in g
bore. Install 2-3 throttle valve spring into the 2-3 throttle
valve bushing and 2-3 throttle valve, stem end first, into the
bushing. Install these 3 parts, valve end first, into the bore,
aligning bushing so pin can be installed in the pin slot (Fig.
7A-157A).
11. Install m anual valve with the inside detent lever pin
groove to the right.
12. If removed, install new seal ring on 1-2 accum ulator
piston.
13. Oil and install 1-2 accum ulator piston, spring
pocket side out, into 1-2 accum ulator piston bore of valve
body.
Control Valve Assembly
Installation
1. Inspect 1-2 accum ulator spring for damage.
2. Install 1-2 accum ulator spring into case (Fig. 7A-
158A).
3. Inspect control valve assembly and spacer plate for
damage (Fig. 7A-159A).
NOTE:
The size of the 5 check balls used in the case
and control valve assembly is 6.35mm (.250"). The size
of the check ball used in the pum p is 7.14mm (.281").
Do not interchange.
Fig. 7A-1 5 7 A —Installing 2-3 Throttle Valve Bushing