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Old 02-18-2018, 10:13 PM   #1
jazzbum
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66 c20 disc swap questions

I've searched all over and have come up goose egg on a couple on fine points of swapping 8 lug drums for 73-87 style discs. Any light you could shed would be much appreciated.

I have a 66 c20 with drums front and rear. I want to swap to discs in front and retain the 8 lug pattern so I can use my existing wheels. I'm looking for the most straightforward way to do it. I do not have the facilities to do a full crossmember swap so I am limited to what I can do at wheel and under the hood.

I am under the impression that all that needs done to physically bolt in the 73-87 disc spindles is to put 73-87 balljoints into the 66 a arms. Is this correct?

Or would it be more straightforward to get everything from the frame out--upper and lower a arms, spindle, brakes--and bolt it into the 66? This assumes that the upper and lower arms from the later truck will physically bolt to the 66. Will they?

As for the tie rod issue that this creates, I guess I will probably use the adapter sleeves that are sold by POL and CPP and others and retain my 66 steering links and ends. The question I have here is, will the c10 adapter that these companies sell also work for my c20 steering with an 8 lug disc spindle, or are the c10 parts smaller/different? Otherwise I suppose I could swap the steering from the donor truck, assuming the widths match. Any advice here?

Also, is there a difference between the spindles found in dually trucks and those found in SRWs? I know the rotors are different, but is the spindle itself different? I seem to see a lot more dually trucks than anything else in the wrecking yards around here, so this would be good to know.

Thanks very much in advance for helping out a newb. Sorry about the novel-length post.
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Old 02-18-2018, 11:04 PM   #2
Clyde65
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Re: 66 c20 disc swap questions

You can do it with a spindle and ball joints but the later model a-arm cross shafts are better and rebuildable, also the a-arm u-bolts should also be replaced.

Easier to just roll one out and roll one in and drill a couple houses.
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Old 02-18-2018, 11:05 PM   #3
Clyde65
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Re: 66 c20 disc swap questions

Duallies are mostly 1 Tom in GM world so yes they are different
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Old 02-19-2018, 12:49 AM   #4
Captainfab
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Re: 66 c20 disc swap questions

On the '63-'66 C20's I do not know for sure if the '73-'87 lower ball joint will press into the '63-'66 lower control arm. I have never tried it. In the past I have just changed the entire front suspension. Also on the '63-'66 C20's, you can not just change to the '73-'87 lower control arms.The '63-'66 lower control arm shafts are flat where they bolt to the crossmember and consequently do not have the saddles required for the round shafts found in the '73-'87 lower control arms. The '73-'87 C30 dually spindles are different than the C20 spindles since the calipers are different. I believe the C20 tierods are larger than the C10 tierods so I do not think the aftermarket aluminum adapter sleeves will work. I have always just used the entire later model steering linkage.
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Old 02-19-2018, 09:51 AM   #5
jocko
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Re: 66 c20 disc swap questions

What are your existing wheels that you want to continue to use? I’ve never found an answer as to whether or not factory pre-1971 16, 16.5 or 17” wheels clear the caliper on a 73+ factory disk setup. I’m particularly interested in the 17” question - and wanted to ask what your wheels are. If aftermarket, you’re fine. If 66 original - I don’t know for certain they we’ll fit (clear the caliper). In the 15” world, they will not - but this is the 16 or larger world, and I don’t know if the taper on the backside of one of those wheels clears a caliper. Seems like it would come closer to clearing it at least. Anyone know?
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Old 02-19-2018, 12:01 PM   #6
Chevy Fleetside
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Re: 66 c20 disc swap questions

Then there is this option. http://www.67-72chevytrucks.com/vboa...d.php?t=357610
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Old 02-19-2018, 12:09 PM   #7
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Re: 66 c20 disc swap questions

Thanks for the replies, guys. That gets me a little closer to having all of the info I'm looking for.

As far as wheels go, mine are definitely not stock '66. In fact, they don't even match--two have outside nubs for hubcaps and two are smooth, like you might see on a 90s era pickup. All are 16" and I'm sure they probably came out of the junkyard from disc-equipped trucks. I'm just hoping to keep them to keep costs down as I get this thing roadworthy.
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Old 02-19-2018, 12:16 PM   #8
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Re: 66 c20 disc swap questions

While I would love to be able to just roll a complete crossmember under the truck, it's just not possible. I am working on the side of the road in a neighborhood that doesn't look favorably on that kind of activity. No garage, not even a truly flat surface to use. Just not a possibility.
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