You have a siezed or partially siezed U-joint. It needs to be replaced immediately before you bend or damage your T-5's tailshaft.
A loose d/s would cause a serious clunk along with a vibration, a broken tranny mount will clunk upon changes between acceleration and deceleration. Since you have no clunk, those aren't the problems.
While the driveshaft can cause a vibration from throwing a weight (technically possible), you will not notice it at low speeds.
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