Not so Good Vibrations

Heres one for the experts. When i step on the gas from a stop, or sometimes even at a rolling start i get about a half a second of minor vibration feels like its coming from the tranny area, but im not sure. The tranny has about 10,500 miles on it. Thats just 500 out of the warrenty provided by the place that rebuilt it for me . Someone PLEASE tell me its not the transmission.

-Mike
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'95 L AWD