My '57 3800 has hydrovac and I'm 99% certain it came that way from the factory. It could have been special order because it was a government truck. http://s305.photobucket.com/user/jfnar/media/57%20chevy%203800/7f5847c2.jpg.html


Last edited by jfnar; 05/09/2014 9:34 PM.

'64 swb stepside (gone)
'57 1 ton
'53 phone truck
'59 swb
'46 1 1/2 ton
'68 swb gmc