I am glad to hear your transmission is working fine., however since the car has been sitting up for awhile, you probably need to drain the transmission and torque converter and refill with fresh ATF, Dexron III, or synthetic fluid. It is an easy job and beats a $2000 rebuild. I think the transmission is the most neglected item on most cars.

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Gary
85 300D Ivory, 202,000
Beatus exsisto Jesu, verus et Deus verus Vir