GM Cadillac 1967-1989 Repair Guide

Adjustments For Gasoline Engines

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SHIFT LINKAGE/CABLE ADJUSTMENT



See Figures 1, 2, 3 and 4

All Models Except 440-T4
  1. Loosen the swivel screw on the shift linkage clamp.
  2.  
  3. Set the lever on the transmission into Neutral by moving it counterclockwise to the L1 detent, then clockwise three detent positions to Neutral.
  4.  
  5. Place the transmission selector lever (in the car) in Neutral as determined by the stop in the steering column. DO NOT use the indicator pointer for reference.
  6.  
  7. Tighten the shift linkage screw.
  8.  
  9. Check that the key cannot be removed and that the steering wheel is not locked when the key is in Run and the transmission is in Reverse. Check that the key can be removed and the transmission linkage is locked when the key is in Lock and the transmission is in Park. Be sure the car will start only in Park and Neutral. If it starts in any gear, the neutral start switch must be adjusted. Start the engine and check for proper shifting in all ranges.
  10.  

440-T4
  1. Move the console shift lever into the Neutral position.
  2.  
  3. Loosen the nut to the cable end pin at the transaxle manual lever arm. The transaxle cable must be assembled to the shift control assembly and installed in the control cable bracket.
  4.  
  5. Position the manual linkage lever arm in the Neutral position. Neutral may be found by rotating the manual lever clockwise from the Park position, through Reverse and into Neutral.
  6.  
  7. With the cable end pin through the lever arm slot, hold the shift lever in the neutral position and then tighten the nut on the cable end pin to 20 ft. lbs. (27 Nm).
  8.  

The lever must be held out of Park when torquing.



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Fig. Fig. 1: Common rear wheel drive shift linkage



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Fig. Fig. 2: Column shift adjustment - 200-4R (engine compartment)



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Fig. Fig. 3: Adjusting the shift control linkage - 440-T4



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Fig. Fig. 4: Adjusting the shift control linkage - 440-T4 (passenger compartment)

BAND ADJUSTMENTS



There are no band adjustments possible or required for the transmissions used in this guide.

DETENT CABLE ADJUSTMENT



Turbo Hydra-Matic 350

THROUGH 1972



See Figure 5

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 pry bar 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 else tighten the retaining screw.
  2.  

Do not lubricate the detent cable.



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Fig. Fig. 5: Adjusting the detent switch - 1967-72 Turbo Hydra-Matic 400

1973 AND LATER

See Figures 6, 7, 8, 9 and 10

  1. Stop the engine.
  2.  
  3. Locate the TV cable adjuster near the carburetor.
  4.  
  5. Depress and hold down the metal tab of the TV cable adjuster.
  6.  
  7. Move the slider until it stops against the fitting.
  8.  
  9. Release the adjuster tab.
  10.  
  11. Turn the carburetor lever to the full throttle stop position and release it.
  12.  

By turning the carburetor lever to the full throttle stop, the TV cable will automatically adjust itself.



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Fig. Fig. 6: Turbo Hydra-Matic 200 and 350 detent cable adjustment



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Fig. Fig. 7: The detent (TV) cable is connected to the throttle lever on the carburetor or throttle body, as applicable



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Fig. Fig. 8: Check linkage and mounting to carburetor or throttle body



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Fig. Fig. 9: View of all transmission related linkage hardware



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Fig. Fig. 10: Check linkage and mounting at this point

DETENT SWITCH ADJUSTMENT



See Figures 11, 12 and 13

Turbo Hydra-Matic 400

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

1968 VEHICLES



  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. (1.27mm) between the switch plunger and the throttle lever paddle.
  8.  

1969 AND LATER
  1. Pull the detent switch driver rearward until the hole in the switch body aligns with the hole in the driver. Insert a 3 / 32 in. (2.38mm) 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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Fig. Fig. 11: Detent (downshift) switch adjustment



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Fig. Fig. 12: Turbo Hydra-Matic 400 downshift switch adjustment



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Fig. Fig. 13: THM 200 downshift cable adjustment

THROTTLE VALVE (TV) CABLE ADJUSTMENT



See Figures 14, 15 and 16

200-4R and 440-T4
  1. Check the transmission fluid level. The engine should be operating properly and the brakes should be adjusted. Check that the cable is connected at both ends.
  2.  
  3. Depress the adjustment tab on the upper end of the TV cable. While holding the tab down, move the slider through the fitting (away from the lever assembly) until it stops against the fitting.
  4.  
  5. Release the tab.
  6.  
  7. Rotate the cable actuating lever to the full throttle stop position. When doing this, the cable slider should rachet out of the cable fitting toward the cable actuating lever.
  8.  
  9. Release the cable actuating assembly.
  10.  

Do not adjust the cable using the throttle pedal.

  1. Check the cable for sticking and binding, at both cold and warm operating temperatures. Road test the vehicle.
  2.  



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Fig. Fig. 14: Throttle valve (TV) cable adjustment - 440-T4



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Fig. Fig. 15: Throttle valve (TV) cable adjustment - 200-R4 and 440-T4



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Fig. Fig. 16: Throttle valve (TV) cable adjustment - 200-R4

 
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