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| | | | Joined: Nov 2017 Posts: 33 'Bolter | | 'Bolter Joined: Nov 2017 Posts: 33 | I need a replacement master cylinder for my 4400. It appears the master cylinder is same as the pickups, is this right? | | | | | Joined: Nov 2017 Posts: 33 'Bolter | | 'Bolter Joined: Nov 2017 Posts: 33 | Is there a kit available to switch the 4400 over to a newer master cylinder with booster? I don't do any heavy hauling with this truck. | | | | | Joined: Sep 2009 Posts: 5,918 Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT | | Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT Joined: Sep 2009 Posts: 5,918 | KingG - The original master cylinder for your '49 4400 was GM# 5454382 - 1-1/4" diameter cylinder bore that fit 1947-51 3/4 ton through 2 ton trucks. 1/2 ton truck master cylinders are not correct for your truck. You can find the one you need available from several of our regular well known vendors, like The Filling Station FS-241A or from various FLAPS under Dorman# M9220. Even rockauto.com carries them as Dorman M9220. BTW - rockauto is the best priced unit I found, but doesn't include shipping and tax which will up that cost just a bit. Hope this helps. 
Last edited by Gdads51; 09/09/2026 2:33 AM. Reason: spelling
~ Dan 1951 Chevy 3 window 3100Follow this story in the DITY Gallery"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)
| | | | | Joined: Sep 2009 Posts: 5,918 Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT | | Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT Joined: Sep 2009 Posts: 5,918 | KingG - Just a note that since your topic is more aligned with "Big Bolt" trucks, I've moved your post to that forum to get the best on topic responses. PS - I think Craig "TUTS 59" might chime in here to offer some thoughts on your "new master cylinder with booster" question.
Last edited by Gdads51; 09/09/2026 2:34 AM. Reason: spelling
~ Dan 1951 Chevy 3 window 3100Follow this story in the DITY Gallery"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)
| | | | | Joined: Oct 2021 Posts: 6,833 'Bolter | | 'Bolter Joined: Oct 2021 Posts: 6,833 | Cut and paste this 5% discount code on the RockAuto order site where it says "How Did You Hear About Us?"
348488184280276751
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
| | | | | Joined: Nov 2021 Posts: 1,383 'Bolter | | 'Bolter Joined: Nov 2021 Posts: 1,383 | I have the original (I believe) master out of my 50 3/4 ton (3600) if that would do you any good. I don't have any knowledge of its performance as it was removed very early in my project. | | | | | Joined: Nov 2017 Posts: 33 'Bolter | | 'Bolter Joined: Nov 2017 Posts: 33 | | | | | | Joined: Nov 2017 Posts: 33 'Bolter | | 'Bolter Joined: Nov 2017 Posts: 33 | Would a conversion kit like this work on my 4400? https://www.ebay.com/itm/304720814853#:~:text=a%20bracket%20and%20pedal-,assembly,-designed%20for%20the%2047 | | |
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