Get pursuit to electronically shift

This year of GM Transmission doesn't have a vacuum modulator, it is all electronically controlled. And yes a shift solenoid can cause this but that should turn the check engine light on and set a fault code.

let transmission shop do pressure test and diagnostic check.many things will cause transmission not to shift right.could have faulty over drive solenoid.faulty VSS sensor it controls shifts. could have faulty TPS sensor or TCM.the first and second shift valves or solenoids bad your transmission is electronically control many things will cause problems the transmission shop use scanner to check out all shift solenoids.the older transmissions use modulator valve and governor valve control transmission shifts but the newer transmissions shifts control by TCM and ECM.

You have valves inside the transmission and electronic controls inside the transmission. When cold, valves do not work because the fluid is too thick. Once warm the fluid thins out and allows tranny to shift OK. You can burn your tranny up by not letting it warm up.

I had the same thing happen to my 05 pontiac pursuit, it was the shifter, the car wasnt reading it was in park, about a $200 fix.

You likely have a failed transmission mechanical part and it is not an electronic problem.

possible harness and connections
transmission could be good but wiring to servos/ solenoids different

Sounds right Aamco is a good shop and they know transmission. Your Explorer transmission is a AODE this a electronic controlled transmission. I would be up set that who ever replaced the transmission before may have damaged the wiring to the transmission. Did you get a war. with the first repair.

Not without a little adapting. The 1993 has a 4l60e which is electronically controlled and has shift solenoids. If the 83 is an overdrive it is a 700r4 which is the same trans but not electronic. If you put it in the speedo wont work and you will need to install a T.V. cable so the transmission will shift. The 93 won't go forward or backwards?

no this is a warranty problem any rebuild is obligated to the mechanic for at least a year to me make him refix it ya dig

Probably a bad ignition switch not sending power to the IGN 0 fuse which provides power to every solenoid in the transmission.