What tranny do you have, TH700R4, or the L model?
It sounds like pump presure is not being relieved. When you turn the vehicle off the presure bleeds down. Any leaks? Are the shift POINTS (rpm wise)the same when it shifts hard? If not you might have a frayed kick down cable.
I am not familiar with the Savana and have never seen this particular problem, but I will help all I can if you can give me some more info.
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