I've been having issues with my e4od. I just had it "rebuilt". I put in a Trans Go shift kit, and got a new HD torque converter. I made sure to free the lines and tranny cooler. I also cleaned the solenoid plug, and I also replaced my neutral safety switch (got busted during swap). I checked resistance on my
SS1, SS2, and it was 29.95 ohms. TCC was 15 ohms. CCS was 29.95 ohms. EPC + to EPC - was 7.5 ohms. My TOT was accurate. I'm running 280 degrees after a 30 mile drive. I'm wondering if my solenoid pack is going bad. It's got a new converter, so I'm doubting that it's bad outta the box. Maybe replace the valve body and solenoid pack? That's a lot of $$$. Wanna save and do this cheaply. I'm already in my Trans 1700 bucks

 

When I have the OD off, it drives ok. But when I'm in OD on, the rpm kinda revs around, and I know it didn't do that before.

 

Does it get hot when OD is cancelled? Is the TC locking?

 

If the converter is not locking, that is likely the main cause of the excessive heat...but that doesn't mean there isn't another issue. Are you sure it was locking before the rebuild, and you are sure it's locking in 3rd currently?