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#445236 08/24/2008 2:52 PM
Joined: Apr 2006
Posts: 38
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Apprentice
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I have recently acquired a '67 C20. It has drum/drum and I also have a '76 3/4 ton. They are both two wheel drive and I was wondering if I can swap out any of the brake parts to end up with disc brakes up front. Also, can the A-arms swap out too? Can anyone steer me in the right direction.

Nick

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You should be able to swap the complete front cross member from the 76 to the 67. I've got a 71 cross member that's waiting rebuild and then it will go under my 63.

Larry


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thanks, I appreciate the help

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'Bolter
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I did the same swap, same '76-'67 years, about four years ago. There are a couple of differences you may want to look at before you start. There is an angled piece on both sides, that the upper A- arms bolt to and this is bolted to the frame rails. The '67 is a large cast piece and the '76 is a lighter piece of pressed steel. They compensated by adding an extra piece on the inside of the frame rails. When bolted together, the frame rail is sandwiched between the two. Only one of those bolt holes line up, if I remember correctly. One has to be drilled and others elongated. The bolts through from the bottom do line up.
I had taken both apart and picked the parts I wanted. I knew I wanted to keep the '67 springs, because the '76 was a big block. I kept the '67 cross member and added the '76 inside frame rail pieces.
Either the upper or lower A-arm and ball joint is the same - fits both 67 drum and 76 disc spindle. The other arm fits only the '76. Sorry, can't remember which I used. If you were planing on using both upper and lower from the '76, you're good.
Be sure and get the sway bar. If you even have one, the '76 will be bigger.
The '67 brake line crosses to the passenger side on the back of the crossmember. The '76 lines go to the radiator crossmember, where the combination valve is located. The line to the rear from the combo valve, goes along the passenger side frame rail to a brass inline connector, just past the bellhousing. Your '67 has the exact same connector in the same spot. Unbolt all the lines from there forward and transfer to your truck. The flex lines go through the frame ahead of the axle, instead of behind on the '67. I think there may have already been a hole there that had to be enlarged.
Be sure and check the lug sizes on the disc hubs. On the '76 I used, they were larger than the '67. I didn't want a mismatch or deal with getting new aluminum wheel lugs, so I replaced the studs in the disc hubs.
Hope that helps.

Last edited by Richard; 08/25/2008 4:24 AM.

'67 GMC 3/4 292 4spd

Moderated by  Fibonachu, KCMongo 

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