I don't know how the factory settings Chevy prescribed for its truck would function on your new axles. But, you could always try.
Or you could run a complete new rear brake circuit from the master cylinder. In this new circuit, you could install a "tunable" prop. valve. Summit carries a manual proportioning valve for about half the cost, or cheaper, of a new prop. valve for the older Fords.
But you will need to have some experience with bending and flaring tube. Also, you will need to rent/buy a double flaring setup.
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