Drilling Rotors? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

blazntn · 05-01-2010, 05:01 PM

What is involved? I am planning on trading for a set of 5x5 rotors and spindles. But, I am wanting to change it to 5x4.75 to match my vette rearend.

**lolife99** · 05-01-2010, 06:17 PM

www.PerformanceOnLine.com sells a truck rotor that has the 5x4.75 pattern already.
These will work as long as your spindles will work with a 1.25" wide rotors.
(not the 1" wide rotors).

blazntn · 05-01-2010, 07:51 PM

ya but cant I just have the rotors I have drilled out to that pattern?

**lolife99** · 05-01-2010, 08:07 PM

sure.

blazntn · 05-01-2010, 08:12 PM

Do you just lay out the pattern and drill it? How do you put the studs in?

Sorry I have never fooled with the brakes much!!!

I plan on having a friend of my dad's do it for me. He works in a CAT machine shop.

project67-stepside · 05-01-2010, 11:59 PM

drilled mine its easy works great< 1/4 holes and countersink bot for bevel>>>

mclairmo · 05-02-2010, 06:06 AM

Those holes promote cracks as does a chamfer. It's best to radius the holes to eliminate sharp edges, as opposed to a chamfer. Will also eat pads more quickly.

LONGHAIR · 05-02-2010, 07:05 AM

Quote:

Originally Posted by project67-stepside

drilled mine its easy works great< 1/4 holes and countersink bot for bevel>>>

Quote:

Originally Posted by mclairmo

Those holes promote cracks as does a chamfer. It's best to radius the holes to eliminate sharp edges, as opposed to a chamfer. Will also eat pads more quickly.

He is talking about changing the bolt pattern of the lug studs, not drilling the disc surface.

midevil1 · 05-02-2010, 08:47 AM

BB 72 Impala brakes go right on the truck spindles and are 4.75 pattern. Crossdrilling works fine if you dont drill thru the venting..... Never had a pair crack and I have done dozens of sets.

blazntn · 05-02-2010, 04:33 PM

what do those impala brakes run at the local parts store? that might be the best way to go!

midevil1 · 05-02-2010, 05:08 PM

Advanced Auto Parts charged me 100.00 out the door for rotors, calipers, pads, bearings, and dust caps. 72 to 73 will work for sure. Take your wheel bearings down to the parts house and test fit to the races. This is a VERY cheap upgrade for the 67 to 70 trucks and the rotors are 12.25 diameter.

blazntn · 05-03-2010, 09:33 PM

Will 1980's models C-10 spindles work on my 69 arms? what do I need to make them work? Might trade my 6 lugs for a guys 5 lug off of an 84!

**lolife99** · 05-03-2010, 10:59 PM

Quote:

Originally Posted by blazntn

Will 1980's models C-10 spindles work on my 69 arms? what do I need to make them work? Might trade my 6 lugs for a guys 5 lug off of an 84!

You will have to change the upper and lower ball joints, and outer tie rod ends.

**Captainfab** · 05-03-2010, 11:01 PM

As long as your '69 is a C10, just change the balljoints and everything else will bolt up. Does your '69 already have power steering?

Quote:

Originally Posted by blazntn

Will 1980's models C-10 spindles work on my 69 arms? what do I need to make them work? Might trade my 6 lugs for a guys 5 lug off of an 84!

blazntn · 05-04-2010, 02:43 PM

It is a c-10. SO I will just need the newer ball joints. I have a dropmember so the tierods wont be an issue.

05-01-2010, 05:01 PM	#1
blazntn Registered User Join Date: Dec 2005 Location: TN Posts: 204	Drilling Rotors? What is involved? I am planning on trading for a set of 5x5 rotors and spindles. But, I am wanting to change it to 5x4.75 to match my vette rearend.

05-01-2010, 06:17 PM	#2
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,700	Re: Drilling Rotors? www.PerformanceOnLine.com sells a truck rotor that has the 5x4.75 pattern already. These will work as long as your spindles will work with a 1.25" wide rotors. (not the 1" wide rotors). __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 Last edited by lolife99; 05-01-2010 at 06:17 PM.

05-01-2010, 07:51 PM	#3
blazntn Registered User Join Date: Dec 2005 Location: TN Posts: 204	Re: Drilling Rotors? ya but cant I just have the rotors I have drilled out to that pattern?

05-01-2010, 08:07 PM	#4
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,700	Re: Drilling Rotors? sure. __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

05-01-2010, 08:12 PM	#5
blazntn Registered User Join Date: Dec 2005 Location: TN Posts: 204	Re: Drilling Rotors? Do you just lay out the pattern and drill it? How do you put the studs in? Sorry I have never fooled with the brakes much!!! I plan on having a friend of my dad's do it for me. He works in a CAT machine shop.

05-01-2010, 11:59 PM	#6
project67-stepside Registered User Join Date: Dec 2009 Location: mesa,az Posts: 94	Re: Drilling Rotors? drilled mine its easy works great< 1/4 holes and countersink bot for bevel>>>

05-02-2010, 06:06 AM	#7
mclairmo Registered User Join Date: Jan 2006 Location: Take Off Posts: 1,908	Re: Drilling Rotors? Those holes promote cracks as does a chamfer. It's best to radius the holes to eliminate sharp edges, as opposed to a chamfer. Will also eat pads more quickly.

05-02-2010, 08:47 AM	#9
midevil1 ShortBus KingPin Join Date: Feb 2010 Location: houston texas Posts: 146	Re: Drilling Rotors? BB 72 Impala brakes go right on the truck spindles and are 4.75 pattern. Crossdrilling works fine if you dont drill thru the venting..... Never had a pair crack and I have done dozens of sets. Attached Images __________________ 67 shortstep prosteet. 505 BBC, FULL BILLET TH350, Owner built EVERYTHING.... (My RIDE) 2008 GMC Yukon DENALI, 425 AWHP, 5700LBS, 12.40's at 109mph. (Her RIDE) 2006 Kawasaki Brute Force, 916cc, 80 shot, 6.20's at 111 mph. (Her RIDE)

05-02-2010, 04:33 PM	#10
blazntn Registered User Join Date: Dec 2005 Location: TN Posts: 204	Re: Drilling Rotors? what do those impala brakes run at the local parts store? that might be the best way to go!

05-02-2010, 05:08 PM	#11
midevil1 ShortBus KingPin Join Date: Feb 2010 Location: houston texas Posts: 146	Re: Drilling Rotors? Advanced Auto Parts charged me 100.00 out the door for rotors, calipers, pads, bearings, and dust caps. 72 to 73 will work for sure. Take your wheel bearings down to the parts house and test fit to the races. This is a VERY cheap upgrade for the 67 to 70 trucks and the rotors are 12.25 diameter. __________________ 67 shortstep prosteet. 505 BBC, FULL BILLET TH350, Owner built EVERYTHING.... (My RIDE) 2008 GMC Yukon DENALI, 425 AWHP, 5700LBS, 12.40's at 109mph. (Her RIDE) 2006 Kawasaki Brute Force, 916cc, 80 shot, 6.20's at 111 mph. (Her RIDE) Last edited by midevil1; 05-02-2010 at 05:08 PM.

05-03-2010, 09:33 PM	#12
blazntn Registered User Join Date: Dec 2005 Location: TN Posts: 204	Re: Drilling Rotors? Will 1980's models C-10 spindles work on my 69 arms? what do I need to make them work? Might trade my 6 lugs for a guys 5 lug off of an 84!

05-04-2010, 02:43 PM	#15
blazntn Registered User Join Date: Dec 2005 Location: TN Posts: 204	Re: Drilling Rotors? It is a c-10. SO I will just need the newer ball joints. I have a dropmember so the tierods wont be an issue.



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