E4od tranny

Hi, I have a 1994 Ford Bronco (full size) 5.0 auto.
Its got a e4od trans, it seems as if the tranny is enguaging rough and shifting really hard. I started by changing the filter, fliud / gasket. That did nothing. Then I figure electrical. There is a mlp/tr sensor on the tranny that I'm told after time when it gets wet / damp can cause my issue. So, I changed it. It came with a new style harness and I repinned the harness and got the sensor in no prob. That still didnt do it. I found while changing the battery cables that the issue "resets" it self. So no my issue is gone. However if I'm on the high way and need to speed up I hit passing gear (not beating on it, gental) and then the issue returns. For now I try to stay away from Overdrive and if the issue returns I pop the battery cables off and it goes away. None the less the problem is still there. What are your thoughts? OD switch? Sensor on the rear diff? Elect selinoid on tranny?
I cant put much more $$ into this beast right now.
I was told could be the yoke (rear) spline issue, I think not though. What would reseting elect have to do with that. Right?
Please help