ok boys and girls here is a doozie. here we vibration in o/d when very slight feathering of accelerator -starts & runs extreemly smooth , only under load. does not happen when vehicle is off ground . cv joints good -new u-joints fr &rr -still does it w/fr driveshaft out trans & motor mounts good. ball joints good . stabilizer links good . new spark plugs, wires good - timed at 0 deg. new dist/module/cap/rtr - fan clutch & all pully's good .tires have been balanced & rotated -will not happen if you lock accelerator in one position . runs smooth under good load and de-accelleration only in o/d not in drive trans in going into lock up, shifts smooth thru all gears .seems to be electrical of some kind to me ? . ok i am stumped on this one any help would be great

 

Could be a bad torque converter

 

I would agree the problem is the torque converter or the trans.

 

after pulling my hair nearly all out i found out that girlfriend brother put 1/2 bottle of sealube in !!!!!! did a complete trans/filter/fluid dump including converter (drilled and tapped for plug ) and it is back to good as new !!

 

Glad to hear it, you got off very cheap.