My hand held unit stopped working. I had Holley Performance help me and found out that the hand held unit wasn't plugged in all the way. After finding that it ran better.
In 1978, TV cables weren't used yet. You have no adjuster on your cable; you have an old-school kick down cable.What that is a TV cable adjuster that is only holding the throttle cable. There's no way to adjust the TV cable that I can see, unless the throttle cable can be mounted in a different area.
The slide bracket is connected to the throttle not the transmission.Here's another one:
Art Carr's 700r4 tv cable adjustment guide from CPTtransmission.com
700r4 tv cable adjustment guide - California Performance Transmission stocks high performance 200-4R and 700R4 Automatic Transmissions, Torque Converters, Shifters and Partswww.cpttransmission.com