Are all 360's balanced the same?

If Im not mistaken,some 360's came backed by a 904 tranny. Therefore the torque converter was balanced ( with small weights )for the 360. It will be weighted externally. I have one of these in my shop on bench. Wasnt that hard to find.

An external balance engine will have small weights welded to the tq converter.


An internal balance engine will have a neutral balance tq converter,so no small weights.

The B&M flex plate gets around this by having weights welded to it,allowing you to use a neutral balance tq converter,which is far more common.