Periodic Low Band Adjustment; Manual Shift Linkage Check & Adjust - Chevrolet 10 1971 Series Chassis Service Manual

CLUTCHES AND TRANSMISSIONS 7-14
Fig. 1P G — Adjusting Low Band Using J-21848
PERIODIC LOW BAND ADJUSTMENT (Fig. IP G )
Low band adjustment should be periodically performed
at first transmission fluid change, or sooner, as nec­
essary if operating performance indicates low band
slippage.
1. Raise vehicle and place selector lever in neutral.
2. Remove protective cap from transmission adjusting
screw.
3. On some models: To gain clearance between under­
body and transmission, it may be necessary to re­
move rear mound bolts from crossmember, and
move transmission slightly toward passenger side of
vehicle.
4. Loosen adjusting screw locknut 1/4 turn and hold in
this position with wrench.
5. Using Special Tool J-21848 adjust band to 70 in. lbs.
and back off four (4) complete turns for a band which
has been in operation for 6,000 miles or more, or
three (3) turns for one in use less than 6,000 miles.
Be^ sure to hold the adjusting screw
CAUTION:
locknut at 1/4 turn loose with a wrench during
the adjusting procedure.
6. Tighten the adjusting screw locknut to specified
torque.
The amount of back-off is not an
CAUTION:
approximate figure, it must be exact.
M A N U A L SHIFT LINKAGE CHECK & ADJUST
1. The shift tube and lever assembly must be free in the
mast jacket. See Section 9 for alignment of steering
column assembly if necessary.
2. To check for proper shift linkage adjustment, lift the
transmission selector lever towards the steering
wheel. Allow the selector lever to be positioned in
drive (D) by the transmission detent.
Do not use the indicator pointer as a
NOTE:
reference to position the selector lever. When
performing linkage adjustment, pointer is ad­
justed last.
3. Release the selector lever. The lever should be in­
hibited from engaging low range unless the lever is
lifted.
4. Lift the selector lever towards the steering wheel,
and allow the lever to be positioned in neutral (N) by
the transmission detent.
5. Release the selector lever. The lever should now be
inhibited from engaging reverse range unless the
lever is lifted.
6. A properly adjusted linkage will prevent the selector
lever from moving beyond both the neutral detent,
and the drive detent unless the lever is lifted to pass
over the mechanical stop in the steering column.
7. In the event that an adjustment is required, place the
selector lever in drive (D) position as determined by
the transmission detent. See Steps 2 and 3.
8. Loosen the adjustment swivel at the mast jacket
lever, and rotate the transmission lever so that it
contacts the drive stop in the steering column.
9. Tighten the swivel and recheck the adjustment. See
Steps 2 and 6.
10. Readjust indicator needle if necessary to agree with
the transmission detent positions. See Section 9.
11. Readjust neutral safety switch if necessary to pro­
vide the correct relationship to the transmission
detent positions. See Section 12.
Fig. 2 P G — Powerglide Control Rod Linkage
10-30 CHEVROLET TRUCK SERVICE MANUAL