My mostly unmolested truck did not have a vacuum reservoir when I acquired it, does not appear to have had one from the factory. I swapped my single speed rear differential for a two speed which is vacuum operated, I added a vacuum tank to the right frame rail and plumbed into the line at a factory tee. Works very well.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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