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Old 03-23-2018, 02:27 PM   #526
64RC20
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Re: Disc Brake Upgrade Reference Thread

The first thread I found on this subject was from Hilandr451, for his totally awesome project on his '66 C20:

http://www.67-72chevytrucks.com/vboa...d.php?t=357610

He upgraded to power steering, which I decided to forgo, based on the expected cost (and I'm scared to death to cut my steering shaft!). I would reconsider this if power steering proves easier and cheaper. But in an effort to find a way to save my original steering, and figure out all the "gotcha's" concerning a C20 disc swap as opposed to a C10, I read through all 21 pages of this current thread looking for every reference to a C20. The list below includes every such post I found:
.
36-39, 48-50, 55-56, 89-90, 155-160!!!, 165-171, 189!, 216-(217!)-219, 293, 336-337, 378, 384-385, 515!-516!, 519!-520!
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Old 03-23-2018, 04:43 PM   #527
64RC20
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Re: Disc Brake Upgrade Reference Thread

Hmmm...the "Quote message in reply?" check box is not working for me. So please bear with me....

In post 216, user 65ChevyC20 asked this:
Quote:
My question is should I do the complete crossmember swap or should I swap the various pieces over to the crossmember on my 65. Which would be easier is what I am asking.
And Captainfab, you replied:
Quote:
Well from a easier perspective, just switching the ball joints, spindles, rotors, calipers, etc. would be the easiest. The '79 lower control arms will not bolt up to your '65's crossmember, since there are no saddles there..
There was no mention of the tie rods, so I guess I'd better ask about them. I'll have my old ones and the new ones from the donor truck so hopefully I'm covered. So, will tie rods, or anything else, be a problem with this "easiest" option? And this option lets me keep my stock manual steering box, right?

From a durability/parts availability perspective, swapping in all of the donor truck's suspension (with or without the crossmember) would definitely be wise, too. But then I think I would have to locate the donor truck's idler arm on the frame and drill new holes for it, right? (I think I could handle that). And then I'm still up against a new 73-79 (to avoid metric) steering box. Can I get it in without cutting my steering shaft? Maybe with your adapter?

Last edited by 64RC20; 03-23-2018 at 04:44 PM. Reason: Got rid of the extra quotation marks
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Old 03-23-2018, 11:48 PM   #528
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Re: Disc Brake Upgrade Reference Thread

With one of my booster brackets you can use a readily available booster and master from a wrecking yard, and have it mounted correctly and safely for a bit less than $300.

Quote:
Originally Posted by 64RC20 View Post
No, if I can accomplish this disc upgrade, I'll definitely want a booster/MC and proportining valve. And with my Social Security budget, I'm open to suggestions on those parts...I found a combo package at Classic Parts but it's over $300 and though it looks nice, I'm hoping to find a less expensive alternative!

My previous engine spun a cam bearing and died (a used 350...lasted 29 years, God bless it) right after I invested $1200 on nice new wheels and tires, so I wanted to protect that $1200 investment. Got lucky on another used 350 from PicknPull ($150 out the door, plus another $100 or so in timing chain, gaskets, etc.). Got lucky there...perfect compression and it runs like a Swiss watch! But now my brakes are wanting attention. So now I'm trying to get them done, including splitting front from rear, as cheaply and safely as possible. When I found this forum, I realized disc brakes were doable.

(If my next posts looks weird, it's because I'm gonna try to use the "quote message in reply" function. That's another learning curve where I'm still looking way up!)
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Power Steering Box Adapter Plates For Sale HERE
Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE
Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE
Hydroboost Mounting Plates HERE
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Old 03-23-2018, 11:53 PM   #529
Captainfab
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Re: Disc Brake Upgrade Reference Thread

I can not verify that the disc brake lower ball joints will press into the '63-'66 C20 lower control arms. Until someone verifies that, I continue to recommend just changing the entire front suspension, crossmember and all.

Yes you will have to drill new holes for the later model idler arm. When converting to power steering you must shorten the original steering column shaft. There's no way around it.

Quote:
Originally Posted by 64RC20 View Post
Hmmm...the "Quote message in reply?" check box is not working for me. So please bear with me....

In post 216, user 65ChevyC20 asked this:

And Captainfab, you replied:

There was no mention of the tie rods, so I guess I'd better ask about them. I'll have my old ones and the new ones from the donor truck so hopefully I'm covered. So, will tie rods, or anything else, be a problem with this "easiest" option? And this option lets me keep my stock manual steering box, right?

From a durability/parts availability perspective, swapping in all of the donor truck's suspension (with or without the crossmember) would definitely be wise, too. But then I think I would have to locate the donor truck's idler arm on the frame and drill new holes for it, right? (I think I could handle that). And then I'm still up against a new 73-79 (to avoid metric) steering box. Can I get it in without cutting my steering shaft? Maybe with your adapter?
__________________
Power Steering Box Adapter Plates For Sale HERE
Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE
Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE
Hydroboost Mounting Plates HERE
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Old 04-22-2018, 11:52 PM   #530
Thommyknocker
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Re: Disc Brake Upgrade Reference Thread

Hi guys,
One thing I didn't find while I was researching the crossmember swap was a good picture of the hole modifications needed.

This is the template I made to transfer the hole pattern.
We are putting a 71 crossmember under my son's 61 C10

I hope these pictures help someone else.
TJ
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Old 05-11-2018, 03:36 PM   #531
68ihscout
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I was reading through this whole thread ,unless i missed it i couldnt find any info on 1970 c20 8lug disk conversion ,i found a donor 73/87 crossmember and all should bolt right up ,i have power assist drums now ,do i need a new booster and brake lines ?? Thanks in advance (or ahould i ask what all do i need )
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Old 05-12-2018, 01:13 AM   #532
Captainfab
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Re: Disc Brake Upgrade Reference Thread

Yes a '73-'87 C20 front suspension crossmember will bolt up just like a '73-'87 C10 crossmember will. In fact on the '67-'72 C20/30's, you do not have to change the entire crossmember like you do on the '63-'66 C20/30's. You can change just the spindles. I believe the '73-'87 lower balljoints should press into the '67-'72 lower control arms. Yes you will need to change the master cylinder and add a proportioning valve. I do not know of a disc/drum master cylinder that has the deep bore in the back of the piston, so you will likely need to change the booster also.

Quote:
Originally Posted by 68ihscout View Post
I was reading through this whole thread ,unless i missed it i couldnt find any info on 1970 c20 8lug disk conversion ,i found a donor 73/87 crossmember and all should bolt right up ,i have power assist drums now ,do i need a new booster and brake lines ?? Thanks in advance (or ahould i ask what all do i need )
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__________________
Power Steering Box Adapter Plates For Sale HERE
Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE
Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE
Hydroboost Mounting Plates HERE
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Old 05-12-2018, 08:18 AM   #533
68ihscout
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Quote:
Originally Posted by Captainfab View Post
Yes a '73-'87 C20 front suspension crossmember will bolt up just like a '73-'87 C10 crossmember will. In fact on the '67-'72 C20/30's, you do not have to change the entire crossmember like you do on the '63-'66 C20/30's. You can change just the spindles. I believe the '73-'87 lower balljoints should press into the '67-'72 lower control arms. Yes you will need to change the master cylinder and add a proportioning valve. I do not know of a disc/drum master cylinder that has the deep bore in the back of the piston, so you will likely need to change the booster also.
Thank you Captain for that great info , any recomendations on what booster to use ,or does 73/87 work?
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Old 05-13-2018, 12:20 AM   #534
Captainfab
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Re: Disc Brake Upgrade Reference Thread

Many people insist on using the '73-'87 boosters, but you have to drill holes to mount it and it is not exactly mounted correctly. My booster brackets use all available factory attachment pints and securely attaches the booster/master to the pedal bracket as GM designed. There are many, many, many compatible boosters. In addition to those mentioned in the for sale thread, every booster bracket comes with a list of compatible boosters including a few part numbers.

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Originally Posted by 68ihscout View Post
Thank you Captain for that great info , any recomendations on what booster to use ,or does 73/87 work?
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__________________
Power Steering Box Adapter Plates For Sale HERE
Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE
Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE
Hydroboost Mounting Plates HERE
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