Working on my 55 and 58 2-tons. (model 6400) the vacuum diaphragm actuator for the speedometer adapter is shot. Does anyone make replacement diaphragms, or do you modify a vacuum advance module to activate it or what is the fix?


Mike
1955 Chevy 6400 ex-flatbed (no bed now!) sold September 2023
In the Stovebolt Gallery
1958 Chevy 6400 flatbed W/dump
In the Stovebolt Gallery
1959 Chevy Suburban Owned for almost 20 years, Daily Driver -- sold May 2016
In the Stovebolt Gallery

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