while im accelerating in my car i feel a vibration from the rearend but only when im in like 2nd gear or higer and i give it just enough throttle so it wont downshift..if i get on the throttle wide oped i dont feel the vibration or even when im driving normal, its only when i accelerate like to pass a car...idk what this is..guessing the stabilizer bar running from the rearend to the tranny might be loose?

Check the Torque Arm mount.

the vibration just gettn worse so i jacked the car up and check underneath for loose things..and i didnt see anything but my tranny and converter espcially has been acting up..makes noises and stuff. could it be the torque converter causing the car to feel like its vibrating when accel? im thinking it could be becuase of the fact that the hood jumps when it starts vibrating and the converter is right there by the firewall close to where the hood sits.

okay so last nite i was driving home and i was at like 3/4 throttle around a curve by my house and all the sudden i hear a (solid thud) like i het something but i could feel it in my seat..so i turned around and checked the street to make sure nothing fell off my car and i didnt see nothing so i turn around..when i manually shift through the gears my 2nd gear at lik 2500-300- will drive but i could revv it like it was in neutral sort of then u could feel the tranny catch and the car would gently jerk...im guessing i have little time to get a tranny and torque converter..

Looks like you have answered your own question.
Time for a new Transmission.

yah its deff trans..if i downshift to 2nd theres almost no 2nd at all but the other gears work but it still vibrates alot..andi have smoke rolling out from where my airvents are and my radio in the center dash..just can figurw out whats burning and it stinks like wires but i took it apart and nothing. put it back togethe rit smokes..