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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: Aug 2004 Posts: 36 Apprentice | | Apprentice Joined: Aug 2004 Posts: 36 | I have seen some power brake drum to drum units on the market for my 3100 53 truck. My question, is there a unit that's a bolt on unit. no cutting or welding. I have a 4 speed in the floor and would like to get the unit that bolts in place. Has anyone done this swap? | | | | | Joined: Mar 2008 Posts: 3,750 'Bolter | | 'Bolter Joined: Mar 2008 Posts: 3,750 | Hi lock....There's units available but as far as clearance for the four speed I'm not sure. I'm using a TH350C and have loads of room,relatively speaking. Here's one from Pirate Jacks It uses the smaller 7" booster for maximum clearance. Not sure if this helps you,but maybe someone else who's done the conversion with a manual trans will chime in....
1950 Chevy Advance Design 3100 in ScotlandIn the Stovebolt GalleryMore pix on Flickr. I've definately got this truck thing in my blood ... my DNA sequence has torque settings"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.
| | | | | Joined: May 2005 Posts: 82 Wrench Fetcher | | Wrench Fetcher Joined: May 2005 Posts: 82 | I have a 327 & m21 4spd with the power brake conversion using drim brakes.
I used a mount bracket that bolts on where the original master cylinder fits & I think I got it from CCP (?) or Brothers.
It works well with a 10# pressure valve in the front brake line.
My only concern is that the master cylinder winds up back under the seat & I had to cut a hole in the floor to fill the m/c.
The other problem is that I can't get the speedo cable to clear the booster & hook up.
1949 chev 3100 3 window. 350hp/327/m21 4 spd, 12 bolt rear, power brakes, 3" dropped axle from Sid's. Disc brakes next.
| | | | | Joined: Mar 2008 Posts: 3,750 'Bolter | | 'Bolter Joined: Mar 2008 Posts: 3,750 | Lock....Here's the Master Power Brakes set up I used. As you can see it utilises the original chassis mount. I know it's an Auto trans,but it lets you see the sort of room you have to play with. This is almost identical to the Pirate Jack unit.
1950 Chevy Advance Design 3100 in ScotlandIn the Stovebolt GalleryMore pix on Flickr. I've definately got this truck thing in my blood ... my DNA sequence has torque settings"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.
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