No reverse

Good morning,

I attached a procedure for the cable adjustment for you. From your description, it sounds like either the cable is out of adjustment or the reverse clutch is seized in the transmission requiring either a rebuild or replacement.

https://www.2carpros.com/articles/automatic-transmission-problems

I would also recommend changing the fluid and filter as well.

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

Roy

Check adjustment by starting the engine in Park and Neutral. Adjustment is okay if the engine starts only in these positions. Adjustment is incorrect if the engine starts in one but not both positions. If the engine starts in any position other than Park or Neutral, or if the engine will not start at all, the park/ neutral position switch may be faulty.

Gearshift Adjustment Procedure
1. Shift transmission into Park.
2. Raise vehicle.
3. Release cable adjuster clamp (at transmission end of cable) to unlock cable.

Fig. 288
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4. Unsnap cable from cable mounting bracket on transmission.
5. Slide cable eyelet off transmission shift lever.
6. Verify transmission shift lever is in Park detent by moving lever fully rearward. Last rearward detent is Park position.
7. Verify positive engagement of transmission park lock by attempting to rotate propeller shaft. Shaft will not rotate when park lock is engaged.
8. Slide cable eyelet onto transmission shift lever.
9. Snap shift cable adjuster into mounting bracket on transmission.
10. Lock shift cable by pressing cable adjuster clamp down until it snaps into place.
11. Lower vehicle and check engine starting. Engine should start only in Park and Neutral.

Pressure test

1. Connect pressure test gauge to test port on passenger side of transmission. Use Adapter 7554 to connect gauge. Be sure test gauge has minimum capacity of 300 psi (2100 kPa).
2. Be sure transmission fluid is at normal operating temperature.
3. Apply parking brakes and block wheels.

Warning: do not allow anyone to stand at the front or rear of the vehicle while performing the following steps in the pressure test.

4. Check and adjust engine curb idle speed.
5. Apply (and hold) service brakes.
6. Shift transmission into D range and note line pressure with engine at curb idle speed. Pressure should be 61 - 70 psi (421 - 481 kPa).
7. Press accelerator pedal to wide open throttle position and note line pressure. Pressure should be 173 - 209 psi (1196 - 1442 kPa).

CAUTION: Do not hold wide open throttle for more than 3 - 4 seconds at a time.

8. Shift transmission into Reverse and note line pressure with engine at curb idle speed. Pressure should be 75 - 90 psi (519 - 618 kPa).
9. Press accelerator to wide open throttle position and note line pressure in Reverse. Pressure should be 213 - 263 psi (1471 - 1814 kPa).

CAUTION: Do not hold wide open throttle for more than 4 seconds.

10. If line pressure is not within specifications, adjust transmission throttle cable and repeat pressure test.

PRESSURE TEST ANALYSIS
If pressures in D and Reverse are higher than specified in test, check for the following:
throttle cable loose, worn, binding or out of adjustment
throttle valve, downshift plug, throttle cam, or primary regulator valve are sticking, worn or damaged

If pressures in D and Reverse are lower than specified in test, check for following:
throttle cable loose, worn, binding or out of adjustment
throttle valve, downshift plug, or throttle cam sticking, worn or damaged
primary regulator valve sticking, worn, or damaged
oil pump gears or housing worn, or damaged
overdrive clutch worn, or damaged

If pressures are low in D range only, check for following:
forward clutch worn or damaged
fluid leakage in D range circuit (component seal and O-rings)

If pressures are low in Reverse only, check for following:
shift cable and manual valve out of adjustment
fluid leakage in reverse circuit (component seal and O-rings)
direct clutch worn or damaged