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Unless the line bias valve spring is replaced with a stiffer spring... the pressure of main line will be low or slow to respond (increase) even with large boost valves as you have installed.
You see higher pressures in R , 1 and 2 gears because GM engineered the trans to boost pressure 'more' in those gears.
Did you install a .500 main boost valve? With a .282 or .296 low - rev boost valve ?
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At the Bonneville Salt Flats, first gear is known as 130 mph.
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