GM Camaro 1967-1981 Repair Guide

Adjustments

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BANDS



There are no band adjustments possible or required for the Turbo Hydra-Matic 350 or 400.

Low Band-Powerglide and Torque Drive

The low band must be adjusted at the first required fluid change or whenever there is slippage.

  1. Position the shift lever in Neutral.
  2.  
  3. Remove the protective cap from the adjusting screw on the left side of the transmission.
  4.  
  5. Loosen the locknut 1 / 4 turn and hold it with a wrench during the entire adjusting procedure.
  6.  
  7. Tighten the adjusting nut to 70 in. lbs, using a 7 / 32 Allen wrench.
  8.  
  9. Back off the adjusting nut [cf2]exactly three turns for a band used less than 6,000 miles. Back off [cf2]exactly four turns for a band used 6,000 miles or more.
  10.  
  11. Torque the locknut to 15 ft. lbs. and install the cap.
  12.  

Intermediate Band-Turbo Hydra-Matic 250

The intermediate band must be adjusted with every required fluid change or whenever there is slippage.

  1. Position the shift lever in Neutral.
  2.  
  3. Loosen the locknut on the right side of the transmission and tighten the adjusting screw to 30 in. lbs.
  4.  
  5. Back the screw out three turns, then tighten the locknut to 15 ft. lbs.
  6.  

SHIFT LINKAGE



Powerglide Column Shift

See Figures 1 and 2

Click image to see an enlarged view

Fig. Fig. 1: View of the column shift linkage used with 1967-69 Powerglide automatic transmission



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Fig. Fig. 2: View of the column shift linkage used with 1970-81 Powerglide automatic transmission

  1. The shift tube and lever assembly must be free in the mast jacket.
  2.  
  3. Lift the selector lever toward the steering wheel and allow the selector lever to be positioned in Drive by the transmission detent.
  4.  
  5. Release the selector lever. The lever should be prevented from engaging low, unless the lever is lifted.
  6.  
  7. Lift the selector lever toward the steering wheel and allow the lever to be positioned in Neutral by the transmission detent.
  8.  
  9. Release the selector lever. The selector lever should now be kept from engaging Reverse unless the lever is lifted. If the linkage is adjusted correctly, the selector lever should be prevented 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.
  10.  
  11. If adjustment is necessary, perform the following steps:
    1. Adjust the linkage by loosening the adjustment clamp at the cross-shaft. Place the transmission lever in Drive by rotating the lever counterclockwise to the Low detent, and then clockwise one detent to Drive.
    2.  
    3. Place the selector lever in Drive and remove any free-play by holding the cross-shaft up and pulling the shift rod downward.
    4.  
    5. Tighten the clamp and check the adjustment.
    6.  

  12.  
  13. On 1969-73 cars, carry out the following additional step:
    1. Place the shift lever in Park and the ignition switch in lock. Loosen the backdrive rod clamp nut. Remove any lash in the column and tighten the clamp nut.
    2.  

  14.  
  15. When the selector lever is in Park, the ignition key should move freely into lock. Lock position should be obtainable only when the transmission is in Park.
  16.  

Powerglide Floor Shift

1967 MODELS

See Figure 3

Click image to see an enlarged view

Fig. Fig. 3: Linkage adjustment points and component identification-1967 Powerglide transmissions with floor-mounted shift mechanisms

  1. Loosen the adjustment nuts at the swivel. Place the transmission lever in the Drive position by moving it counterclockwise to the Low detent, and then clockwise one detent position to Drive.
  2.  
  3. Place the floorshift lever in Drive. Hold the floorshift unit lower operating lever forward against the shift lever detent.
  4.  
  5. Place a 0.094 in. spacer between the rear nut and the swivel. Tighten the rear nut against the spacer.
  6.  
  7. Remove the spacer and tighten the front nut against the swivel, locking the swivel between the nuts.
  8.  

1968-73 MODELS

See Figure 4

Click image to see an enlarged view

Fig. Fig. 4: Floor shift linkage adjustment for 1968-72 models

1968 and later cars use a cable-type shift linkage.

  1. Place the shift lever in Drive.
  2.  
  3. Disconnect the cable from the transmission lever. Place the transmission lever in Drive by rotating the lever counterclockwise to the Low detent, and then clockwise one detent to Drive.
  4.  
  5. Measure the distance from the rearward face of the attaching bracket to the center of the cable attaching pin. If this distance is not 5.5 in., loosen and move the cable end stud nut to obtain the correct measurement.
  6.  

1969 and later models require an additional backdrive adjustment.

  1. Place the shift lever in Park and the ignition switch in the LOCK position.
  2.  
  3. Loosen and adjust the backdrive rod.
  4.  
  5. With the selector lever in Park, the ignition key should move freely into the LOCK position. LOCK position should not be obtainable in any transmission position other than Park.
  6.  

Turbo Hydra-Matic Column and Floor Shift

See Figures 5, 6 and 7



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Fig. Fig. 5: Floor shift linkage component identification for early Turbo Hydra-Matic (THM) transmissions



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Fig. Fig. 6: Floor shift linkage adjustment for late (1973-81) THM transmissions



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Fig. Fig. 7: Column shift linkage components used with THM transmissions

For THM floor shift procedures, refer to the Powerglide procedures.

Linkages used on Turbo Hydra-Matic transmissions are similar to those used on Powerglides. Adjustments are the same, except that the transmission lever is adjusted to Drive by moving the lever clockwise to the Low detent, and then counterclockwise two detent positions to Drive.

1967-74 MODELS-(EXCEPT THM 200)
  1. Loosen the swivel at the lower end of the rod that comes from the column.
  2.  
  3. On 1973 and later models, set the transmission lever in the Neutral detent by turning the lever counterclockwise to the L1 detent, then clockwise two positions. On models through 1972, set the lever in the Drive detent by turning the lever counterclockwise to the L1 detent, then clockwise two positions.
  4.  
  5. Put the column lever in Neutral for 1973 and later models, and in Drive for models through 1972. The important thing here is not where the indicator points but that the lever be in the correct position.
  6.  
  7. Tighten the swivel. Readjust the neutral start switch as necessary.
  8.  
  9. Check that the key cannot be removed and that the wheel is not locked with the key in RUN. Check that the key can be removed in LOCK with the lever in Park, and that the steering wheel is locked.
  10.  

1967-74 MODELS-THM 200
  1. Remove the screw and washer from the swivel assembly on the rod which activates the transmission shift lever.
  2.  
  3. Put the transmission shift lever in Neutral by turning it counterclockwise to L1 detent, then clockwise two detent positions. Put the transmission selector lever in Neutral as determined by the mechanical stop in the steering column assembly-do not use the indicator pointer.
  4.  
  5. Turn the swivel until it lines up directly with the hole in the shift lever, and install screw and washer. You should not have to force the transmission lever to move in either direction to install the screw.
  6.  
  7. Adjust the transmission indicator pointer and neutral start switch.
  8.  
  9. Check that the key cannot be removed from the RUN position if the transmission selector is in Reverse and that the key can be removed with the selector in Park. Make sure the lever will not move from Park position with key out of the ignition.
  10.  

1975-81 MODELS
  1. Loosen the swivel at the lower end of the rod that comes from the steering column.
  2.  
  3. Loosen the pin at the transmission end of the cable.
  4.  
  5. Set the floorshift lever in the Drive detent.
  6.  
  7. Set the transmission lever in the Drive detent by moving it counterclockwise to the L1 detent, then clockwise two detent positions.
  8.  
  9. Tighten the nut on the pin at the transmission end of the cable.
  10.  
  11. Put the floorshift lever in Park and the ignition switch in LOCK.
  12.  
  13. Pull down lightly on the rod from the column and tighten its clamp nut.
  14.  

THROTTLE VALVE LINKAGE



See Figure 8

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Fig. Fig. 8: Throttle valve linkage adjustment points for inline 6-cylinder and V8 engines

Powerglide
1967-73 6-CYLINDER MODELS
  1. Depress the accelerator pedal.
  2.  
  3. The bell crank on 6-cylinder engines must be at the wide open throttle position.
  4.  
  5. The dash lever at the firewall must be 1 / 64 - 1 / 16 in. off its lever stop.
  6.  
  7. The transmission lever must be against the transmission internal stop.
  8.  
  9. Adjust the linkage to simultaneously obtain the conditions in Steps 1-4.
  10.  

1967-73 V8 MODELS
  1. Remove the air cleaner.
  2.  
  3. Disconnect the accelerator linkage at the carburetor.
  4.  
  5. Disconnect both return springs.
  6.  
  7. Pull the throttle valve upper rod forward until the transmission is through the detent.
  8.  
  9. Open the carburetor to the wide open throttle position. Adjust the swivel on the end of the upper throttle valve rod so that the carburetor reaches wide open throttle position at the same time that the ball stud contacts the end of the slot in the upper throttle valve rod. A tolerance of 1 / 32 in. is allowable.
  10.  

DETENT CABLE



Turbo Hydra-Matic 250 and 350

See Figure 9

Click image to see an enlarged view

Fig. Fig. 9: Detent cable adjustment for THM 350 transmissions (THM 250 transmissions similar)

These transmissions utilize a downshift cable between the carburetor and the transmission.

  1. Pry up on each side of the detent cable snap-lock with a small prybar to release the lock. On cars equipped with a retaining screw, loosen the detent cable screw.
  2.  
  3. Squeeze the locking tabs and disconnect the snap-lock assembly from the throttle bracket.
  4.  
  5. Place the carburetor lever in the wide open throttle position. Make sure that the lever is against the wide open stop. On cars with Quadrajet carburetors, disengage the secondary lock-out before placing the lever in the wide open position.
  6.  

The detent cable must be pulled through the detent position.

  1. With the carburetor lever in the wide open position, push the snap-lock on the cable or tighten the retaining screw.
  2.  

Do not lubricate the detent cable.

1974-81 Models

The detent cable on these models adjusts itself the first time the accelerator pedal is pushed to the floor.

DETENT SWITCH



Turbo Hydra-Matic 400 transmissions are equipped with an electrical detent, or downshift switch operated by the throttle linkage.

1968 Models

See Figure 10



Click image to see an enlarged view

Fig. Fig. 10: Detent switch adjustment for 1968 THM 400 transmissions-the clearance between the plunger and the paddle should be 0.05 in.

  1. Place the carburetor lever in the wide open position.
  2.  
  3. Position the automatic choke so that it is off.
  4.  
  5. Fully depress the switch plunger.
  6.  
  7. Adjust the switch mounting to obtain a distance of 0.05 in. between the switch plunger and the throttle lever paddle.
  8.  

1969-81 Models

  1. Pull the detent switch driver rearward until the hole in the switch body aligns with the hole in the driver. Insert a 0.092 in. diameter pin through the aligned holes to hold the driver in position.
  2.  
  3. Loosen the mounting bolt.
  4.  
  5. Press the switch plunger as far forward as possible. This will preset the switch for adjustment, which will occur on the first application of wide open throttle.
  6.  
  7. Tighten the mounting bolt and remove the pin.
  8.  

 
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