hey guys i have a 85 bronco II with the a4ld, when i got it it seemed to be decent. i have to give it alot of gas to get moving, and its constantly going in and out of lockup and in and out of 4th going about 55. also i have busted a weld on a stud conecting the torque converter to the flexplate and i have a slight leak comming from there. anyways at about 55-57 mph when it goes in od i get a nasty vibration from my rig...i mean the whole thing violantly shakes up and down like an out of balance tire or something. its not the tires though it didnt do it before i broke the stud loose on the torque converter when i changed out the rear main seal. ive tried a different driveshaft, but it doesnt feel like d-shaft vibes...like when im driving and it does it i can watch the front end bouncing. i checked the fluid and its fine, all the bellhousing to engine bolts are tight, converter to flexplate bolts are tight, and the transmission mount is fine. any ideas on wtf is going on? is this thing gonna crap out on me? also when it starts shaking, and i give it more gas it doesnt do it as bad, and when i let of the gas it stops

EDIT: also at idle i hear a ticking sound comming from the bellhousing, kinda sounds like valves tapping

i also changed the fluid and filter and it still does it, nothing funky in the pan either