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Old 06-16-2017, 02:21 AM   #1
Bison
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64 GMC Axle swap questions.

Hi all,

I have a 64 GMC 4x4, that is a resto-mod project.

It currently has Dana 44 axles with closed knuckles and drum brakes. I have the front and rear axles from an 86 K5 Blazer. From poking around here and on other sites I understand that the front axle is pretty much a bolt in swap that will give me disc brakes up front.

However, I'm starting to pull my hair out over said brakes.

I have this style master cylinder, and want to go with a dual diaphragm brake booster from Tuff Stuff.

I'd like to run an adjustable proportioning valve, and am starting to go crazy trying to find things that will make all of this work (based on brake line sizes).

Looking for suggestions on prop valves, distribution blocks, or even different master cylinders and boosters that will work.

I'd like to stick with a dual diaphragm booster though, because I'm using a Captain Fab bracket for a trans swap, and the spacing between the brake booster and clutch master seems tight.

Thanks for any input!
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Old 06-16-2017, 09:34 AM   #2
Nanook
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Re: 64 GMC Axle swap questions.

Hey Bison,

Don't mean to hijack your thread, but if your original axles come up for sale please let me know as I have a friend in Calgary that could pick them up for me.

Thanks
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Old 06-16-2017, 04:23 PM   #3
Brad54
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Re: 64 GMC Axle swap questions.

I'm going to be doing about the same thing as you on my '62 K10. I've got a GMC Dana 44 rear axle, and am looking to swap in an open-knuckle 44 with discs.

I'll be using a factory proportioning valve that comes on disc/drum trucks. GM did the engineering already, so I see no reason to second-guess them.

-Brad
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'62 K-10 long-step project
Nostalgia Altered drag car with 2x4 FE Ford.
'57 Chevy 2dr 150 wagon gasser
'76 Power Wagon daily driver
'56 Chevy 2dr basket case
'54 Buick Special
'73 Duster on a rotisserie

Hi, my name is Brad, and I have a problem!
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Old 06-17-2017, 12:28 PM   #4
Bison
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Re: 64 GMC Axle swap questions.

Quote:
Originally Posted by Brad54 View Post
I'm going to be doing about the same thing as you on my '62 K10. I've got a GMC Dana 44 rear axle, and am looking to swap in an open-knuckle 44 with discs.

I'll be using a factory proportioning valve that comes on disc/drum trucks. GM did the engineering already, so I see no reason to second-guess them.

-Brad
Yeah, maybe I'll follow the KISS rule for now (Keep It Simple, Stupid!)
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Old 06-18-2017, 01:45 PM   #5
Brad54
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Re: 64 GMC Axle swap questions.

Quote:
Originally Posted by Bison View Post
Yeah, maybe I'll follow the KISS rule for now (Keep It Simple, Stupid!)
It seems like it'll be the most pain-free solution for me!

I'm also going to swap self-adjusters into the rear Dana 44; I made that swap on all four corners of my '61 Suburban (also with a factory Dana 44 rear), and it makes life pretty easy.
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'61 Suburban daily driver: off the road due to 180-pound 8-pt buck!
'62 K-10 long-step project
Nostalgia Altered drag car with 2x4 FE Ford.
'57 Chevy 2dr 150 wagon gasser
'76 Power Wagon daily driver
'56 Chevy 2dr basket case
'54 Buick Special
'73 Duster on a rotisserie

Hi, my name is Brad, and I have a problem!
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Old 06-18-2017, 06:24 PM   #6
'63GENIII
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Re: 64 GMC Axle swap questions.

Quote:
Originally Posted by Bison View Post
Hi all,

I have a 64 GMC 4x4, that is a resto-mod project.

It currently has Dana 44 axles with closed knuckles and drum brakes. I have the front and rear axles from an 86 K5 Blazer. From poking around here and on other sites I understand that the front axle is pretty much a bolt in swap that will give me disc brakes up front.

However, I'm starting to pull my hair out over said brakes.

I have this style master cylinder, and want to go with a dual diaphragm brake booster from Tuff Stuff.

I'd like to run an adjustable proportioning valve, and am starting to go crazy trying to find things that will make all of this work (based on brake line sizes).

Looking for suggestions on prop valves, distribution blocks, or even different master cylinders and boosters that will work.

I'd like to stick with a dual diaphragm booster though, because I'm using a Captain Fab bracket for a trans swap, and the spacing between the brake booster and clutch master seems tight.

Thanks for any input!
The booster that I got was for a square body C/K 30. The clutch master is a tight fit but it does fit there. I think the booster is a single diaphragm.
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'63 k15 long step
Vortec 7.4 - L29 Blackbear tune, Five 0 Motorsports injectors, Chris Straub Cam, NV4500, divorced 205
52" front and 63" rear spring swap
D44 / 14bff - disc axles
Milemarker 9K and 10.5K hydraulic winches

63" & B52 Spring Install http://67-72chevytrucks.com/vboard/s...ng+swap+thread


NV4500 Reverse Build Thread http://67-72chevytrucks.com/vboard/s...=reverse+build

L29 - 7.4 Vortec Build http://67-72chevytrucks.com/vboard/s...&highlight=L29
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Old 06-18-2017, 06:26 PM   #7
'63GENIII
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Re: 64 GMC Axle swap questions.

FWIW, I think Captainfab makes a plate to mount both. If I were to do it again, Id go that route. He makes some cool parts with all of the guesswork taken out.
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Chris


'63 k15 long step
Vortec 7.4 - L29 Blackbear tune, Five 0 Motorsports injectors, Chris Straub Cam, NV4500, divorced 205
52" front and 63" rear spring swap
D44 / 14bff - disc axles
Milemarker 9K and 10.5K hydraulic winches

63" & B52 Spring Install http://67-72chevytrucks.com/vboard/s...ng+swap+thread


NV4500 Reverse Build Thread http://67-72chevytrucks.com/vboard/s...=reverse+build

L29 - 7.4 Vortec Build http://67-72chevytrucks.com/vboard/s...&highlight=L29
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