To add to Mike's application info, diaphragm GM# 3847058 shows in Chevy Master Parts Books as fitting all the way back to 1946 vacuum shifted 2 speed axles, as well as up through 1974 Chevy and GMC Models with the 15,000 lb T150 axle.

Hope this info might help find it a new Stovebolt home. wink

~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)