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09-01-2008, 05:55 PM | #1 |
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Swapping to 73+ rotors
Is it possible to swap from the rotor on my 71 to a 73 and newer rotor? Are the bearings the same? I have a set of wheels and tires that are 5x5 pattern but the centerhole is too small to fit over the 71 rotors. I have ECE drop spindles on the truck right now.
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09-01-2008, 11:23 PM | #2 |
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Re: Swapping to 73+ rotors
I seem to recall the 'pilot hole' for the hub is the same dimension on all the 1.25" C10 disc rotors so I don't think the 73-up will work any better. That being said, any machine shop should be able to turn the rotors hub down to the dimension you need w/o breaking the bank & might be worth investigating since you already have the wheels.
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. Last edited by SCOTI; 09-01-2008 at 11:23 PM. |
09-02-2008, 02:40 AM | #3 |
Restoring a 68 SWB
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Re: Swapping to 73+ rotors
I just bought a set of drop spindles from Tim Christian and he told me the 73 and up rotors were the only ones that would work with these drop spindles. The brand is Mcgaughay. I don't know if that helps your situation any, but that's what he told me because I already had a set of rotors and calipers from a 69.
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09-02-2008, 05:45 AM | #4 |
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Re: Swapping to 73+ rotors
The nice thing about the ECE components is that the boxes arrive with GM labels on them. Aren't GM rotors the same from '71 to '87? All of their components are designed so you can use aftermarket parts to replace anything with a stock spec.
Does this situation boil down to the wheels being hub centric and not originally designed to fit the stock hubs on our trucks?
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Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
09-02-2008, 08:15 AM | #5 | ||
its all about the +6 inches
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Re: Swapping to 73+ rotors
If the pilot hole was smaller starting in 73, then we'd never be able to run the 73 - 87 rallys on the 71/72 trucks.
They are the same size. Quote:
Quote:
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09-02-2008, 09:16 AM | #6 | |
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Re: Swapping to 73+ rotors
Quote:
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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09-02-2008, 09:36 AM | #7 |
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Re: Swapping to 73+ rotors
Call ECE.....they have a toll-free tech line.
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Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
09-02-2008, 11:08 AM | #8 |
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Re: Swapping to 73+ rotors
I thought the 73-87 rotors would not work on a 71-72 hub, the center hole isint the problem but the way it mounts to the spindle, as for the wheels, I thought the size of the hub (centerhole) went smaller in 1999.
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1967custom Last edited by michael bustamante; 09-02-2008 at 11:10 AM. |
09-02-2008, 03:33 PM | #9 |
Restoring a 68 SWB
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Re: Swapping to 73+ rotors
Sorry, don't know what I was thinking. The guy who gave them to me pulled them off a 69. A previous owner had put them on there. I knew better. I meant 71-72.
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09-02-2008, 04:50 PM | #10 |
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Re: Swapping to 73+ rotors
Thanks for all of the replies. All I know is I bought the wheels and they were on a 78 Blazer but wont fit onto my 71. The wheels are weld draglites. I called Summit and talked to a tech and he told me the wheels were different from 71-2 to 73 and up. The centerholes are smaller on the 73 and up. I was hoping I could just swap rotors and be ok. They fit on the front of my 67. The 67 has a 78 crossmember swapped in.
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09-02-2008, 04:58 PM | #11 | |
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Re: Swapping to 73+ rotors
Quote:
__________________
67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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09-02-2008, 06:08 PM | #12 |
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Re: Swapping to 73+ rotors
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