The original hydrovac does not support a dual master setup. You might be able to run dual hydrovacs though its probably not a practical approach.

Another option is to remove the hydrovac completely and simply use a dual master with no assist. The power assist was an option on the 1-1/2 ton trucks and some of them did not have it.


1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble...