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#1 |
Before and After
Join Date: Feb 2000
Location: Leduc, Alberta CANADA
Posts: 632
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Drilling 5 bolt to 6 bolt - disks, drums and axles
Is it ok to redrill the disks, axles and drums with no strength degrading or other issues?
My components are in good condition and would be a shame to purchase new while there is still lots of life left in them. Of course it would be done by a machine shop for accuracy.
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Not Grandpa's C-20 anymore... 383 Stroker 425HP, 485Ft/Lbs Lowered 3.5" Front / 5" Rear 66,000 miles. Alberta, CANADA |
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#2 |
Senior Member
![]() Join Date: Jun 2009
Location: Belews Creek , NC
Posts: 4,220
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Re: Drilling 5 bolt to 6 bolt - disks, drums and axles
Not sure about your area but after pricing getting the axles re drilled it was just as cheap to get a pair of axles. I was going from 6 to 5
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Larry It is easily overlooked that what is now called vintage was once brand new. "Project 68" paypal.me/ldgrant |
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#3 |
Registered User
Join Date: Apr 2015
Location: East Tn (In the heart of the Smoky Mtns)
Posts: 1,870
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Re: Drilling 5 bolt to 6 bolt - disks, drums and axles
Nope. Each of the bolt patterns are cast for that purpose. A five bolt hub doesn't have the strength in the right area to be filled and re-drilled fo six.
Years ago I looked into doing this because I figured it would be cheaper for me to take a 71 hub assembly to a machine shop and have it reworked to fit my six bolt 70. The nice man explained to me the amount of labor involved to even try this. It's not even close to economical. There's lots of conversation kits out there, and at very reasonable prices. Is your truck a daily driver, or used for towing? The drums work fine for occasional drivers. I guess it comes down to if its worth the cost to you to do the conversion. |
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#4 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,721
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Re: Drilling 5 bolt to 6 bolt - disks, drums and axles
Not sure why you would want to got to 6 from 5... but would be easy to swap your 5 lugger stuff to someone else wanting to get rid of the 6.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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#5 | |
Before and After
Join Date: Feb 2000
Location: Leduc, Alberta CANADA
Posts: 632
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Re: Drilling 5 bolt to 6 bolt - disks, drums and axles
Quote:
I wasn't to run a certain rim is the reason for 6 bolt conversion. I have a friend who owns a machine shop, the labor would be a swap for beer or favour. I have not noticed any difference in the casting of the drums, I believe disks and axles are machined, I can't imagine them being different.
__________________
Not Grandpa's C-20 anymore... 383 Stroker 425HP, 485Ft/Lbs Lowered 3.5" Front / 5" Rear 66,000 miles. Alberta, CANADA |
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#6 |
Before and After
Join Date: Feb 2000
Location: Leduc, Alberta CANADA
Posts: 632
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Re: Drilling 5 bolt to 6 bolt - disks, drums and axles
I have been looking for someone local to supply them to me, but have had no luck. I'll keep looking.
__________________
Not Grandpa's C-20 anymore... 383 Stroker 425HP, 485Ft/Lbs Lowered 3.5" Front / 5" Rear 66,000 miles. Alberta, CANADA |
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#7 |
Registered User
Join Date: Mar 2017
Location: Loranger, LA.
Posts: 51
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Re: Drilling 5 bolt to 6 bolt - disks, drums and axles
Anyone have any idea about if 99 GMC serria parts will work spindles rotors rear brake assambely
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#8 | |
Before and After
Join Date: Feb 2000
Location: Leduc, Alberta CANADA
Posts: 632
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Re: Drilling 5 bolt to 6 bolt - disks, drums and axles
Quote:
Is there an option of a swap from other vehicles?
__________________
Not Grandpa's C-20 anymore... 383 Stroker 425HP, 485Ft/Lbs Lowered 3.5" Front / 5" Rear 66,000 miles. Alberta, CANADA |
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#9 |
Registered User
Join Date: Mar 2017
Location: Loranger, LA.
Posts: 51
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Re: Drilling 5 bolt to 6 bolt - disks, drums and axles
As of now no I bought a 99 GMC for the 5.3 LS and wasn't sure if ant of the disc brake components would work on my 70 C10. 99 GMC has power disc brakes on all four corners I could put that rear end in my 70 but with some fab work.
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