So I'm running a 700R4 behind a SBC400. The rear end is an 8.8" geared at 3.27. I'm trying to get the TV cable set correctly, which I think it's close, but my RPM's are running way to high down the highway. At 65 mph I'm over 4,000 RPM's. It is shifting into OD, which it does between 45-50 MPH so I don't think it's staying in 3rd. I can see and feel it shift up, but the RPM's are crazy. Has anyone run into this issue or know what may be causing this?