Chevrolet Blazer/Jimmy 1969-1982 Repair Guide

Adjustments

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SHIFT LINKAGE



Incorrect linkage adjustment may result in premature transmission failure, due to the controls not being fully engaged with the detent. Partial engagement of clutches and other internal parts will result in early transmission failure.

1969-72 Models


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Fig. Fig. 1 Exploded view of the automatic transmission shift position indicator-1969-72 models



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Fig. Fig. 2 Automatic transmission shift linkage location and mounting-1969-72 models

  1. The shift tube and levers located in the mast jacket of the steering column must move freely and must not bind.
  2.  
  3. Pull the shift lever toward the steering wheel and allow the lever to be positioned in Drive by the transmission detent. The pointer may be out of adjustment, so don't use it as a reference for positioning the lever.
  4.  
  5. Release the selector lever. The lever should not go into Low unless the lever is lifted.
  6.  
  7. Lift the lever toward the steering wheel and permit the lever to be placed in Neutral by the transmission detent.
  8.  
  9. Release the lever; it should not go into Reverse unless the lever is lifted.
  10.  
  11. If the linkage is adjusted correctly, the shift lever will not move past the Neutral detent and the Drive detent unless the lever is lifted so it can pass over the mechanical stop in the steering column.
  12.  
  13. If adjustment is necessary, place the lever in the Drive position. If the indicator pointer is out of alignment, you must rely upon the detent position to determine what gear you are in (see Steps 2 and 3).
  14.  
  15. Loosen the adjustment swivel or clamp at the bottom of the column and move the shift lever so that it contacts the Drive stop in the column.
  16.  
  17. Tighten the swivel and recheck the adjustment (see Steps 2 and 6).
  18.  
  19. If the indicator pointer fails to line up properly with the gear symbol, adjust the position of the pointer and scale.
  20.  
  21. If necessary, readjust the neutral safety switch.
  22.  

1973-82 Models


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Fig. Fig. 3 Shift linkage adjustment points-1973-83 automatic transmissions



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Fig. Fig. 4 Remove the lower column cover to gain access to the shift position indicator adjustment point-1973-82 models

  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 detent. Do not use the selector lever pointer as a reference.
  4.  
  5. Release the selector lever. The lever should not be able to go into 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 lever should not be able to engage reverse unless the lever is lifted. A properly adjusted linkage will prevent the lever from moving beyond both the Neutral and Drive detents unless the lever is lifted.
  10.  
  11. If adjustment is required, remove the screw (A) and spring washer from the swivel clamp (B).
  12.  
  13. Set the transmission lever (C) in Neutral by moving it to L 1 and then three detents clockwise.
  14.  
  15. Put the transmission selector lever in Neutral as determined by the mechanical stop in the steering column. Do not use the indicator pointer as a reference. The pointer is the last thing to be adjusted.
  16.  
  17. Assemble the swivel spring and washer to the lever (D) and tighten.
  18.  
  19. Readjust the Neutral safety switch if necessary.
  20.  
  21. To adjust the shift position indicator, remove the column cover at the bottom of the instrument panel and loosen the screw to move the pointer.
  22.  
  23. Check the operation. With the switch in RUN , and the transmission in Reverse, be sure that the key cannot be removed and that the steering wheel is locked.
  24.  

With the key in LOCK and the shift lever in PARK, be sure that the key can be removed, the steering wheel is locked, and that the transmission remains in PARK when the steering column is locked.

DOWNSHIFT CABLE



This cable runs from the carburetor linkage to the transmission. It regulates the throttle position at which a downshift occurs.

1969-71 Models


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Fig. Fig. 5 Downshift cable mounting locations-1969-71 models

  1. Remove the air cleaner.
  2.  
  3. Loosen the detent cable screw.
  4.  
  5. With the choke off and the accelerator linkage adjusted, position the carburetor lever in the wide open position.
  6.  
  7. Pull the detent cable rearward until the wide open throttle stop in the transmission is felt. The cable must be pulled through the detent position to reach the wide open throttle stop.
  8.  
  9. Tighten the detent cable screw and check the linkage for proper operation.
  10.  

1972 Models


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Fig. Fig. 6 Downshift cable mounting-1972-74 models

  1. Remove the air cleaner.
  2.  
  3. Pry up on each side of the snap-lock with a screwdriver to release the lock.
  4.  
  5. Compress the locking tabs and disconnect the locking tabs from the bracket.
  6.  
  7. Pull the carburetor to the wide open throttle position against the stop on the carburetor.
  8.  
  9. With the carburetor held in this position, pull the cable housing rearward (through the detent) until the wide open throttle stop in the transmission is felt.
  10.  
  11. Push the snap-lock on the cable downward until it is flush with the cable.
  12.  
  13. Do not lubricate the cable. Install the air cleaner.
  14.  

1973-82 Models


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Fig. Fig. 7 Downshift cable mounting-1972-74 models



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Fig. Fig. 8 Downshift cable mounting-1975-82 models

With the snap-lock disengaged from the bracket, position the carburetor at the wide open throttle position. Push the snap-lock downward until the top is flush with the rest of the cable.

The 700R4 transmission uses a downshift switch that adjusts itself, after installation, when gas pedal is floored.

 
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