Hi, I have a 1943 4400 series 1.5 ton truck. 216 all stock driveline and brakes. Regular manual brakes. I want to add a hydrovac, like the '46 6400S series had. They used a Bendix #374550 booster unit. I have one, but it looks like it came from the bottom of the ocean. I know I can use it as a core on a rebuilt one. My question is, can you use a better / newer / less obsolete / less expensive unit like a #51-8049, as seen on the Loadstar trucks in the 70s? Wondering if there would be any hydraulic pressure differences / issues, etc. My 216 has 22 in. of vacuum. So no issues there. I would rather use a newer unit if it will work ok. I am going to swap in a 235 splash intake manifold on my 216, that has the large vacuum threaded port in the side for the hydrovac vacuum supply. The brake lines I will just make up and put the hydrovac in line between the master cylinder and the 4 wheels, just like the 6400 truck was done. My truck has the stock 1 1/4" master cylinder, same as the 6400S had. Thanks!!
