Originally Posted by sharpshooter3578
It is most definetly the transmission or torque converter. The engine runs great, I put TR 55s in it about a month ago. It doesn't miss and is really responsive. I have asked about this a few times on here but I guess I don't know enough about the torque converter to distinguish whether it is that or the transmission.
It'* pretty hard to diagnose this one without doing some checks on the transmission. First thought that comes to mind would be the line pressure comming off the pump. If you have low line pressure, then it can't hold the gear selected. It will also have sloppy shifts since the bias pressures in the valve body will be whacked out and not slide the valves, even with the help of the kickers.
Torque converters are tough to kill without spinning them up to un-godly rpms. The TCC circuit can fail (and probably has if you have line presure problems) but it usually exhibits itself when the engine rpm starts yo-yo-ing 100rpm at steady-state cruise on light throttle only.