Please help with transmission on a 1991 park avenue?

Question:
I have a 1991 Buick Park Avenue, weird things been going on the tranny, when i first start it up and put it into gear sometimes it will take right off and sometimes it acts like it slips or something it just wont move, BUT if i was to put it into reverse or first gear first then put it back into drive it takes off perfect and i wont have ANY problems at all with it. So to me it cant be a worn band i wouldnt think cuz it would just not work any of the time right? I was wandering if there are sensors or solenoids that could be causing this. IT never slips at any time after i move it initially. And it will ALWAYS move if i put it into first gear or reverse first. Thankyou

Answers:

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It sounds like the valve body is sticking. The drive piston is ether sticking or something is jamming it so when you go to reverse , it unlocks and allows you to go into drive.

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Check out the clutch or torque converter

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There is sort of a sensor. It depends on if you have a cable going from your throttle to your trans, a vaccum line, or just a set of wires to it. I'm guessing the first two options because of the age of it. They work as measurement of when to shift up or down depending on engine load. If it is a vaccum you can remove the hose and see if there is trans fluid there. That would be a sure sign of that module being faulty. Sorry I couldn't say more.
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