Chevrolet Full-size Cars 1968-1978 Repair Guide

Adjustments

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LINKAGE



Column Shift


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Fig. Fig. 1 Column shift adjustment on 1968 vehicles



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Fig. Fig. 2 Column shift adjustment on 1969-73 vehicles

1968 VEHICLES
  1. Located on the left side of the transmission case are two levers. Manipulate these levers until the transmission is in neutral. Depress the clutch pedal, start the engine, and release the pedal slowly. If the vehicle fails to move and the engine is still running with the pedal fully released, the transmission is in neutral. If the vehicle moves, the transmission is in gear and the levers should be repositioned until neutral is found. Loosen the swivel nuts on both shift rods.
  2.  
  3. Move the shift lever (on the column) to the neutral position. Raise the hood and locate the shifter tube levers on the steering column. Align the 1st and reverse lever with the 2nd and 3rd lever. Using a large L-shaped Allen wrench, hold these levers in alignment (most vehicles have alignment holes in the levers and an alignment plate) until the linkage is connected.
  4.  
  5. Make the final adjustments to align the shift rods and levers at the transmission into the neutral position. Road test the vehicle and check the shifting operation. If the adjustment is correct, the alignment pin should pass freely through all alignment holes. If not, readjustment is necessary.
  6.  

1969 VEHICLES
  1. Turn the ignition switch to the OFF position.
  2.  
  3. Loosen the swivel nuts on both shift rods.
  4.  
  5. Place the column mounted shift lever in the reverse position. There are two levers located on the side of the transmission case. The lever to the front of the transmission controls 2nd and 3rd gears while the other lever controls 1st and reverse. Place this 1st and reverse lever into the reverse position. Push up on the 1st/reverse shift rod until the column lever is in the reverse detent position. Tighten the swivel nut.
  6.  
  7. Place the column lever and the transmission levers (located on the side of the case) in neutral. The shift tube levers are located on the steering column mast jacket. Make sure the column lever is in neutral and hold it in this position by inserting a pin through the alignment holes in the shift tube levers (a 1 / 16 " Allen wrench is perfect).
  8.  
  9. Hold the 2nd/3rd shift rod steady, to prevent a change in adjustment and tighten the swivel locknut.
  10.  
  11. Remove the alignment pin from the shift tube levers and shift the column shift lever to the reverse position. Turn the ignition key to LOCK and check the ignition interlock control. If it binds, leave the control in LOCK and readjust the 1st/reverse rod at the swivel.
  12.  
  13. Move the column lever through the gear positions and return it to neutral. The alignment pin should pass freely through the alignment holes of the shift tube levers. If it doesn't loosen the swivel nuts and readjust.
  14.  

1970-73 VEHICLES
  1. Place the shift lever (on the column) in reverse and the ignition switch in OFF position.
  2.  
  3. Raise the vehicle and support it with safety stands.
  4.  
  5. Loosen the locknuts on the shift rod swivels. Pull down slight on the 1st/reverse control rod on the lower steering column to remove any slack. Tighten the locknut at the transmission lever.
  6.  
  7. Unlock the ignition switch and shift the column lever into neutral. Position the shift tube levers, which are located on the lower steering column in neutral by aligning the lever alignment holes. Hold them in this position by inserting a 1 / 16 " Allen wrench through the alignment holes.
  8.  
  9. Hole the 2nd/3rd shift rod steady and tighten the rod locknut.
  10.  
  11. Remove the alignment tool from the shift tube levers and check the shifting operation.
  12.  
  13. Place the column lever in reverse and check the movement of the ignition key. In reverse and only reverse, the key must turn freely in and out of LOCK.
  14.  

Floor Shift
1968-73 VEHICLES WITH 3-SPEED
  1. Loosen the locknuts on both shift rod swivels. The shift rods should pass freely through the swivels.
  2.  
  3. Move the floor shift to Neutral and install the locating gauge into the shifter bracket assembly.
  4.  

The locating gauge is a piece of 1 / 8 " thick flat stock 41 / 64 " wide and 3" long.

  1. Position the levers on the transmission in Neutral. Turn the 1st/reverse shift rod nut down against the swivel, and then tighten the locknut against the swivel.
  2.  
  3. Turn the 2nd/3rd shift rod nut down against the swivel, and then tighten the locknut against the swivel.
  4.  

On 1969-73 vehicles, skip Step 4 and perform Steps 5-8. Step 4 is the final step for 1968 vehicles.

  1. Remove the locating gauge, and shift into Reverse. Turn the ignition switch to the LOCK position.
  2.  
  3. Loosen the swivel locknut on the reverse control rod. Pull down slightly on the control rod to take up any slack in the column mechanism, and then tighten the clevis jam nut.
  4.  
  5. The ignition switch should move easily in and out of lock. If there is any binding present, keep the switch in LOCK and readjust the reverse control rod.
  6.  
  7. Check shift pattern for correct operation.
  8.  

1968 VEHICLES WITH 4-SPEED
  1. Remove the control rods from the transmission levers, and position the levers in Neutral.
  2.  
  3. Move the floor shift lever into Neutral and insert a locating gauge into the bracket assembly (use the same gauge as the 3-speed floor shift).
  4.  
  5. Adjust the length of the control rods, and then secure the swivels with the jam nuts and install the clevis pins.
  6.  
  7. Remove the locating gauge, and check the shift pattern.
  8.  

Muncie transmission levers have two control rod holes. Attaching the control rods in the lower holes will result in reduced shift lever travel and allow faster shifting, with increased shifting effort as a minor drawback.

1969-70 VEHICLES WITH 4-SPEED
  1. Turn the ignition switch to the OFF position, except on 1970 models which should be turned to LOCK position.
  2.  
  3. Loosen the swivel locknuts on the shift rods and reverse control rod. Position the transmission side cover levers to their Neutral detent position.
  4.  
  5. Place the floor shift in Neutral and insert a locating gauge (same gauge as 3-speed floor shift) into the lever bracket assembly.
  6.  
  7. Adjust all control rods swivels for easy entry into their respective levers.
  8.  
  9. Tighten the shift rod locknuts and remove the gauge.
  10.  
  11. Shift the lever into Reverse and pull down slightly on the reverse rod to remove the slack. Tighten the locknut.
  12.  
  13. The ignition switch should now be above to be moved easily into LOCK, and it must not be possible to turn the key to LOCK, when in any other position other than Reverse. Readjust the reverse rod, if necessary.
  14.  
  15. Check the shift pattern for correctness.
  16.  

 
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