I have and 84 t Bird 5.0. Transmission is locked into drive in all positions. In park nuetral and reverse it wants to go forward. Any solutions? Also can I purchase a tranny w/o the OD option that will bolt up? I have had bad luck with AODs and would like to just put a simple 3 speed automatic in it if it will bolt up. Thank you, Tony

Define won't crank ? I'am assuming the key will turn to the start position ! When doing so does the starter spin the engine or not ? Trying to define your problem of won't crank . If when you turn the key to start position an the starter spins the engine over but doesn't start an run , this is a cranks no start condition . If nothing happens when you turn the key to start , this is a no crank no start condition . Your vehicle has a safety system , shift interlock , won't let it shift out of park if the brake pedal isn't pressed . Won't let the key turn off either . Electronics involved , locking solenoid's etc.... Floor or column shift ?
The automatic transmission shift lock control system is a safety device that prevents an inadvertent shift out of PARK when the engine is running. The driver must press the brake pedal before moving the shift lever out of the PARK position. The system consists of the following components:
• The automatic transmission shift lock solenoid (serviced as the automatic transmission shift lock actuator), as well as the body control module (BCM) and the engine control module (ECM)/powertrain control module (PCM). The shift lock solenoid is located within the floor shift control assembly with vehicles equipped with floor shift.
• The BCM controls the voltage supply circuit of the shift lock control solenoid. The following conditions must be before the BCM will supply voltage to the shift lock control solenoid.
The BCM controls the voltage to the shift lock control solenoid through the shift lock control solenoid controlled voltage circuit. The following conditions must be met before the BCM will supply voltage to the shift lock solenoid:
• The ignition is in the ON position.
• The ECM/PCM sends an input via GMLAN serial data to the BCM indicating the transmission is in the PARK position.
• The BCM determines the brake pedal is applied according the brake pedal position.
Since the shift lock control solenoid is permanently grounded, the BCM supplies voltage to the automatic transmission shift lock control solenoid, mechanically unlocking the shift lever allowing the driver to move the shift lever out of the PARK position as the solenoid energizes. When the brake pedal is not applied, the BCM turns the control voltage output of the shift lock control solenoid OFF, de-energizing the shift lock control solenoid. The de-energized solenoid mechanically locks the shift lever in the PARK position.
During remote start operation, the BCM will de-energize the shift lock control circuit, locking the shift lever in the PARK position.

Plus the reverse lock out !
The reverse lockout system is a safety feature which prevents an inadvertent shift into reverse at speeds above 5 km/h (3 mph). The system consists of the following components:
• The engine control module (ECM)/powertrain control module (PCM)
• The reverse lockout solenoid
With the ignition ON, battery voltage is supplied directly to reverse lockout solenoid. At forward speeds above 5 km/h (3 mph), the ECM/PCM commands the reverse lockout solenoid ON by grounding the control circuit of the solenoid. This energizes the solenoid and mechanically prevents the shift lever from being moved into the REVERSE position. At forward speeds below 5 km/h (3 mph), the ECM/PCM commands the reverse lockout solenoid OFF, de-energizing the solenoid, which allows the shift lever to move into the REVERSE position.

Power Mode Master
This vehicles BCM functions as the power mode master (PMM). The ignition switch is a low current switch with multiple discrete ignition switch signals to the PMM for determination the power mode that will be sent over the serial data circuits to the other modules that need this information, and so the PMM will activate relays and other direct outputs of the PMM as needed. Refer to Power Mode Description and Operation for a complete description of power mode functions.
You have no clue of the electronics in your vehicle , your best bet have it towed to the Buick dealer .

the inter lock will get you stuck in park but not reverse unless your linkage is forced
maybe you have a different problem
try to put the car in nuetral while the key is only one click forward and your foot on brake , that may get you moving

some fords have a key hole on the bottom of the steering column and you can just put your key in and put the car in neutral, then start the car and drive

rechange the transmition oil its posible to work as normal

Vehicle does not move forward.
The following parts and assemblies need to be checked thoroughly.
1. Manual valve
2. Valve body assembly
3. Forward clutch C1
4. Planetary gear unit
5. 1st and reverse brake (B3)
6. Park/ neutral position switch

Most transmission control lever with cable lock bolt become lose in time need to re adjust position to the right place and tighten the bolts ,it can easily done by jacking up the suv and look under the transmission .

Failed Transmission Again

Part with it

Get something else

Maybe American (Rear Wheel Drive Only)

Replace the blower motor,

it sounds like the problem started with the brake shift iterlock switch by forcing it he now broke the trans shift cable mech at the column

pburcham: In studying up on your problem, I could only come up with a few possibilities from your description.
1. Linkage adjustment
2. A problem with the "Low and reverse Brake band"
however, this usually has a symptom of poor acceleration
due to the transmission slipping. That band has to grab the drum to hold for low gear.
3. Problem with the manual valve in the valve body.
4. Damaged seals causing pressure leakage which will keep the clutches from locking up.
5.Defective "High Reverse clutch" (front) check ball
Possibly a few other things, but everything (unfortunately) is still internal. The inhibitor switch is for the starting circuit and just keeps you from starting the car in anything but park and neutral.
Transmission control unit will not have this harsh an effect. It should operate without the TCU. You should be able to do a manuel shift with the transmission.
Sorry I couldn't be of more help.
I can say one thing, these transmissions were not known for failures, consequently should be a dime a dozen in salvage yards.
Why or how you got a bad one?????? Don't know?
If I can help, let me know........

need to adjust the shift linkage