Originally Posted by spidey3479
Also is the TV cable the same as the shift linkage cable?
Negative. TV (Throttle Valve) just runs from the throttle body down to the throttle valve in the valve body of the transmission. The shift linkage cable runs from your column/floor shifter to the transmission.
Upshifts are all controlled by the TV, governor, and modulator. Based on what you said, I presume you are getting a high rpm upshift in light to part throttle operation (because if you are hammering the throttle W.O.T, then you want high rpm upshifts)
Check your vac line to the modulator (Little can on the front side of the transmission case..mine says "Holley" on it.) It modulates transmission line pressure opposite vac...so if it is leaking, you get hard/delayed upshifts (0 vac to modulator = max line pressure inside the transmission)
If you have adjusted the TV right (backed the cable all the way out, then pushed the accelerator pedal all the way down) there really isn't much left on the outside of the transmission. Everything else would be in the valve body.