i have a 1967 four door thunderbird with a 390 big block. i belive something is wrong with the transmission because when in automatic it never changes from first and in order to start the car it must be in neutral...
Does your T-bird have the swing away steering wheel? If it does normal wear can cause the park switch to misalign for the park position, try moving and holding the shift lever up in the park position as you turn the key, if it cranks then it is and adjustment or a worn switch pawl, you may wind up replacing the neutral safety switch. The tranny shift problem is not related to the neutral switch. Check the vacuum supply to the transmission modulator valve, if there is no vacuum the valve will hold the trans in low gear until the pressures build up in the valve body forcing a pressure shift, this will occur at a very high engine RPM so it is not recommended you try to get it to pressure shift, the other thing to check is the trans kickdown rod, make sure it is connected up and moves freely. HTH
Sounds like a linkage adjustment problem
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