Hi, Looking for advice. I have a '94 Ford Explorer Sport. Has about 176k miles & A4LD tranny. About a month ago the tranny has been acting up after it gets warm (5-10min). Took it to a transmission shop to see what was up. They said the torque converter lock up was not working properly. It shifts just fine until about 45mph then it can't seem to decide what gear it wants to stay in. (3-4 or OD). If i barely accelerate, it'll jump back to 3rd & if i hold the throttle, just barely letting it decelerate, it'll shift back into 4th followed by sometimes OD. At the moment, my explorer is torn apart in my garage, as it was needing front and rear suspension replaced. (My husband is a mechanic, but doesn't deal with transmissions. I just do simple maintenance stuff.) I have acquired a junk explorer to swap parts with. Now my question is this, after doing some reading, i am wondering if my tranny troubles could be fixed by replacing the 3-4 & tcc solenoid or maybe it is something electrical? OR should i just swap my tranny for the junk explorer's one instead? (I do not know the state it was in before the engine went caput.) Thanks in advance.