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1957 Chevy Bel Air Convertible; ZZ4 w HEI ign; 700r4; 9" rear w/3:50 gears; pwr disc fr w drum rear
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I have the TV cable, throttle linkage, and carb geometry 100% dialed in on my 700r4 conversion. I have the TV cable adjusted to bottom out exactly at 100% WOT. From all of my research this should be the ONLY way to set it, and it should not be altered to adjust shift quality.

WOT from dead stop, I'm getting good spread on 1st year (approx 30mph) and 3rd gear (approx 70mph) BUT I can't get 2nd gear to spread out under WOT...it shifts too early at approx 35-40 and bogs the car down.

What components of the 700r4 will address this? (again, NOT adj the TV cable. It's stayin' where it is.) I'd like some ideas so that I can give my installer some suggestions next week.


Thanks
Ace
 

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The shift points at WOT are controlled by the governor. The governor has springs and weights that can be changed for that. B&M has an inexpensive governor spring and weight kit that will help you tune that if you feel the need. It also has instructions to help you choose the weights and springs.

The governor's output is modified by the TV valve (actuated by the TV cable) for part throttle conditions.

Thing is, if you mess with the governor, you're going to be messing with the shift points in all gears. Same with the TV valve/cable.

The only thing that tunes an individual shift point is the shift valve itself. These have a spring that resists governor/tv pressure. So to do something with the 2-3 shift you will either have to change the spring on the 2-3 shift valve, or to put a shim behind it.

If you can find a diagram of your valve body, you will see where the 2-3 shift valve is. Usually the valve train and spring is held in by a tapered pin, and this pin can't be removed unless you remove the valve body. It goes in from the top.
 
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