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    GM Chevy Mid-Size Cars 1964-1988 Repair Guide

    Linkage Adjustment

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    See Figure 1 COLUMN SHIFT

    1964-66
    1. Position both transmission levers in NEUTRAL.
    2.  
    3. Position the column selector in NEUTRAL. Align the 1st/reverse and 2nd/3rd shifter tube levers on the steering jacket.
    4.  
    5. Install the control rods on the steering jacket levers and secure them with lock clips.
    6.  
    7. Install a swivel on the 1st/reverse shifter control rod and adjust until the swivel can freely enter the transmission shift lever hole (rear). Install a retaining clip on the swivel and insert the swivel in the lever hole and secure with a nut.
    8.  
    9. Install the 2nd/3rd lower rod to the frame mounted idler lever and in the 2nd/3rd transmission lever and secure with retaining clips.
    10.  
    11. Install the upper 2nd/3rd shifter control rod, in the same manner as the 1st/reverse shifter control rod (Step 4), to the frame idler and the jacket shifter lever.
    12.  

    Ensure that the shifter tube levers stay in alignment.

    1. Check the adjustment by moving the shift lever through all the gear positions.
    2.  



    Click image to see an enlarged view

    Fig. Fig. 1: Column shift linkage adjustment-1967-69 vehicles

    1967-68
    1. Located on the left side of the transmission case are tow levers. Manipulate these levers until the transmission is in NEUTRAL. Verify that the transmission is in NEUTRAL by depressing the clutch pedal, starting the engine, and slowly releasing the pedal. If the car fails to move and the engine is still running with the pedal fully released, the transmission is in NEUTRAL. If the car moves, the transmission is in gear and the levers should be repositioned until NEUTRAL is found.
    2.  
    3. Once the transmission has been verified to be in NEUTRAL, loosen the swivel nuts on both shift rods.
    4.  
    5. 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 an alignment pin (a large L-shaped Allen wrench should suffice), hold these levers in alignment (most cars have alignment holes provided in the levers and an alignment plate) until the linkage is connected.
    6.  
    7. Make the final adjustments to align the shift rods and levers at the transmission into the NEUTRAL position. Road test the car 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.
    8.  

    1969
    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 REVERSE. 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 REVERSE. 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 (in order to verify the neutral position, refer to Step No. 1 from the 1967-68 procedure). 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 3 / 16 in. Allen wrench is perfect for this).
    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.  

    1970-72
    1. Place the shift lever (on the column) in REVERSE and the ignition switch in OFF .
    2.  
    3. Raise the car and support it safely using jackstands.
    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 (located on the lower steering column) in NEUTRAL by aligning the lever alignment holes. Hold them in this position by inserting a 3 / 16 in. Allen wrench through the alignment holes.
    8.  
    9. Hold 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 in reverse, the key must turn freely in and out of LOCK .
    14.  

    Floor Shift

    See Figures 2, 3 and 4

    3-SPEED 1968-72
    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 of1/8in. thick flat stock4/64in. wide and 3 in. 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. For 1969 vehicles, skip this step. For 1968 vehicles, this is the final step. Turn the 2nd/3rd shift rod nut down against the swivel, and then tighten the locknut against the swivel.
    4.  

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

    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 the shift pattern for correct operation.
    8.  



    Click image to see an enlarged view

    Fig. Fig. 2: 3-speed floor linkage adjustment-the backdrive shown is on 196-72 models



    Click image to see an enlarged view

    Fig. Fig. 3: Muncie 4-speed linkage adjustment

    4-SPEED 1964-68
    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 a 5 / 16 in. rod on 1964 cars. For 1965-74 4-speeds 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.  

    1965 and later 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.



    Click image to see an enlarged view

    Fig. Fig. 4: Saginaw 4-speed linkage adjustment

    4-SPEED 1969-81
    1. Turn the ignition switch to the OFF position, except on 1970 models which should be turned to LOCK .
    2.  
    3. Loosen the swivel lock nuts 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 move 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.  

    CLUTCH SWITCH ADJUSTMENT & REPLACEMENT



    A clutch operated neutral safety switch was used beginning in 1970. The ignition switch must be in the START position and the clutch must be fully depressed before the car will start. The switch mounts to the clutch pedal arm. To remove this switch, loosen the fastener(s) or the retaining clip, then pull it from the pedal arm. This switch cannot be adjusted.

     
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