That switch is in the trunk behind the plastic on the driver side by the taillights
SOURCE: will not shift into overdrive.
Some possible causes for the A4LD transmission are:
1. Case connector and/or harness not seated.
2. 3-4 shift solenoid (3-4 solenoid wire pin 52 should read
approx 20 ohms)
3. Powertrain Control Module
4. Vacuum line disconnected from MAP sensor.
5. Map sensor
6. Throttle position sensor
7. Vehicle speed sensor
You may want to check to see if you have any codes as it will let you know if one of the sensors are at fault. Hope this helps, good luck.
SOURCE: 93 buick park avenue wont shift into overdrive
1993 Buick Park Avenue. The overdrive shifts in and out on flat ground. It holds o.k. when in a slight pull up grade.
SOURCE: My 88 F-150 AOD 4wd shifts hard into overdrive
Fairly normal.
It is a planetary gear system with a conic frustum shaped clutch. So it tends to grab fast and hard. That is good, because then it wears less.
SOURCE: 1985 150 ford aod transmission will not shift 3rd.
check your fluid level if its good find the rubber hose from transmission to carb or intake. make sure there is no kinks or cuts. if the rubber hose from the modulater valve on the transmission is not hooked up its not going to shift right hopefully its not your pump or stuck valves
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