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#1 |
Registered User
Join Date: Feb 2006
Location: riverside, ca.
Posts: 4
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70 C/20 Disc Brake Swap
I have a 70 c/20 with power drum all around. I also have a 87 3/4 Sub that
I'm parting out. Can I use the front disc on my 70? If so, what do I need from the Sub? |
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#2 |
Senior Member
![]() Join Date: Feb 2004
Location: Williamsburg, Ohio
Posts: 1,783
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Re: 70 C/20 Disc Brake Swap
ttt
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#3 |
Registered User
Join Date: Jul 2005
Location: delta,canada
Posts: 19
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Re: 70 C/20 Disc Brake Swap
i have a 71 c 20 I am parting out and it has disc brakes on it, if you are interested
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#4 |
'68 C-20 396 CST CC
![]() Join Date: Mar 2005
Location: Spokane, WA
Posts: 454
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Re: 70 C/20 Disc Brake Swap
Welcome to the board!!!:
![]() Check out this thread in the FAQ's (lots of great information there): http://67-72chevytrucks.com/vboard/s...ad.php?t=13692 OR, you can swap the entire crossmember, but you have to elongate (egg-hole) some of the holes in the frame to make the newer crossmember fit. You also have to use the newer MC and proportioning valve to accomodate the front discs. Some guys have gotten away without changing the MC/prop valve but the pressure is different and you will have less stopping power (which is why you'd want to do the swap anyway). Good luck--
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68 C-20 396/TH400 CST Custom Camper NOW W/DISC BRAKES ![]() 01 Jetta Turbo Daily Driver ![]() 84 Yamaha Virago 700 - Alaska to Florida Via Maine & Mexico ![]() |
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#5 |
Senior Member
Join Date: Apr 2005
Location: Joppa, Maryland
Posts: 4,408
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Re: 70 C/20 Disc Brake Swap
I've been told that you can just drop the whole front suspension, (4 bolts) and bolt it to your truck. I have a 84 Sub, and plan on doing just that to my 70 GMC...
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1997 GMC Sierra Ext 1965 Mustang |
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#6 |
Registered User
Join Date: Nov 2005
Location: Breckenridge, texas
Posts: 83
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Re: 70 C/20 Disc Brake Swap
I'm doing that right now, so I can't help much. I just tore down a 77 3/4 disk system. I am using the entire front end from the 77, except I tore it all down to rebuild first. Just ordered the PST OE kit today. I have most of the 77 front end cleaned and blasted. If it gets warm enough the next couple of days, I will get it all painted and ready to go back together.
Doug |
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#7 |
Registered User
Join Date: Dec 2005
Location: canada
Posts: 166
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Re: 70 C/20 Disc Brake Swap
I'm still trying to find the answer to whether the swap is just that, remove the bolts, re and re the cross member and bolt back in. Are they an exact match or is there more to it then that. I have a '67 SWB that I would like to update to disc brakes and power steering, and finding a front suspension from a 73 to 86 is quite easy here. I know I will have to update the M cylinder and steering pump, but right now the cross member is my main objective.
Hagen
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'70 Malibu with 383 stroker/T350 '56 SWB Mercury pickup..under construction '67 Firebird Convertible...all done stock '70 LWB 350 on propane...beater '69 LWB 350/T400 body restored |
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#8 |
Watch out for your cornhole !
![]() Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Re: 70 C/20 Disc Brake Swap
Yes, you can use your later donor truck stuff.
It's just like a 1/2 ton swap is. The front crossmember is held to the frame by 14 bolts. Twelve of them will line straight up and the last two are close enough to allow slight enlongation for lining up. Just bolt up the 12 and the last two will be obvious and easy to drill since the 12 bolts have the crossmember secured and aligned.
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I'm on the Instagram- @Gearhead_Kevin |
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#9 |
Senior Member
Join Date: Apr 2005
Location: Joppa, Maryland
Posts: 4,408
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Re: 70 C/20 Disc Brake Swap
Did I say 4 bolts?? I ment 14.........duh
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1997 GMC Sierra Ext 1965 Mustang |
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#10 | |
Registered User
Join Date: Feb 2006
Location: riverside, ca.
Posts: 4
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Re: 70 C/20 Disc Brake Swap
Quote:
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#11 | |
Registered User
Join Date: Feb 2006
Location: riverside, ca.
Posts: 4
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Re: 70 C/20 Disc Brake Swap
Quote:
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#12 | |
Registered User
Join Date: Feb 2006
Location: riverside, ca.
Posts: 4
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Re: 70 C/20 Disc Brake Swap
Quote:
Also, The 87 is a big block and the 70 is a small block. Thanks, Jim |
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