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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Mar 2010 Posts: 1,660 Curmudgeon | | Curmudgeon Joined: Mar 2010 Posts: 1,660 | I would guess the 1939 1/2 ton panel truck uses the same master cylinder as a 1939 1/2 ton truck.
The Master Parts List says 1 inch diameter master cylinder 1938-1946 for a 1/2 ton.
Cast number 5450256. Part number 5454575 correction 5454576. Is this what you have now?
Last edited by buoymaker; 06/12/2022 5:51 PM.
"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."
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