Chevrolet 1980 Light Duty Truck Repair Manual page 330

(4 0 0)7 A -44 A U TO M A TIC TR A N S M IS S IO N S
Fi g . 7 A - 1 3 8 C ~ A i r C h e c k i n g C o n v e r t e r
1. Inspect case assembly for cracks, porosity or inter­
connected passages.
2. Check for good retention o f band anchor pins.
3. Inspect all threaded holes for thread damage.
4. On m odel CL inspect studs for thread damage, and
make sure they are tight.
The tw o (2) studs at 9 o 'clock and 11 o 'clock (when
viewed from the rear o f case and transmission in vehicle)
are approxim ately 1/4" longer than the other four (4) studs.
These tw o longer studs are required to accom m odate the
parking brake actuating cable bracket.
5. Inspect interm ediate clutch driven plate lugs for
dam age or brinneling.
Fig. 7A-1 39 C -L oose ning Collet on Tool J-2 1 57 1-8
If the case assem bly requires replacement, rem ove the
nam eplate from the old case and re-install it on the new case,
using the truss head nam eplate attaching screw that is
serviced w ith the case.
6. Inspect snap ring grooves for damage.
7. Inspect bore for governor assembly for scratches or
scoring.
8. Inspect m odulator valve bore for scoring or damage.
9. Inspect cup plug inside case for good staking and
sealing.
10. Inspect case bushing. If necessary to replace,
proceed as follows:
Case Bushing
Remove
W ith case properly supported, using tool J -2 1465-8,
with D river Handle J-8092, rem ove bushing.
Replace
U sing tool J -2 1465-8 adaptor ring J-21465-9, Driver
H andle J-8092, and extension J -2 1465-13, with lube passage
facing front o f transmission case, drive replacement bushing
into case until .040 to .055 above selective washer face. Stake
bushing w ith tool J -2 1465-10. Stake marks to be in bushing
lubrication grooves.
IN S P E C T IO N OF C O N V E R TE R
1. Check converter for leaks as follow s (Fig. 7A-138C):
a. Install T ool J -2 1369 and tighten.
b. A pply 80 psi air pressure to tool.
c. Submerge in water and check for leaks.
2. Check converter hub surfaces for signs o f scoring or
wear.
Converter End Clearance Check (Figs. 7A-139C
and 7A-140C)
1. Fully release collet end o f T ool J-21371-8.
2. Install collet end o f T ool J-21371-8 into converter
Fig. 7A-1 40 C -C h eck ing Converter End Clearance