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#1 |
Registered User
Join Date: Sep 2012
Location: Columbia, SC
Posts: 549
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1971 Original Front Disc Brakes?
Hi All, I'm new to the board and need some expert advice. I have a 71 GMC 350 Longbed with 2.25 leafspring rear and disc fronts. The last owner said the front end was from a 72 but I have doubts. I measured the front disc and it is 1-1/8 inch thick. Not 1.25. Markings on rotor say: 1.215, K6, L60, 3963998. Markings on caliper say: G25, I8. 1" studs approx 5" apart. Can you help identify my front end, I'm looking to get some drop spindles, etc? THANKS!
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Life is too long to go slow... ![]() 71 GMC 1500 Super Custom LWB 350/350 AC(replaced w/vintage air)/PS/PB 2.5 CPP Spindle, 1" CPP Drop Spring, CPP Front and Rear Sway Bars/DJM Flip, new General Spring KC 5 spring pack, HEI /IntReg Alt 20x8.5 OldSkools 5" BS, 275/45 Falkens |
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#2 |
Registered User
Join Date: Oct 2010
Location: Ocean Springs, MS
Posts: 1,746
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Re: 1971 Original Front Disc Brakes?
Disc brakes were standard on a 71.
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Gary 1971 Chevrolet C/10 1951 GMC 100 1977 GMC C15 1955 Chevrolet 3100 |
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#3 |
Registered User
Join Date: Sep 2012
Location: Columbia, SC
Posts: 549
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Re: 1971 Original Front Disc Brakes?
Thanks, That's what I thought. PO just let it rust and was going by what his PO said....Could 1-1/8" disc thickness be 1.25" worn down?
__________________
Life is too long to go slow... ![]() 71 GMC 1500 Super Custom LWB 350/350 AC(replaced w/vintage air)/PS/PB 2.5 CPP Spindle, 1" CPP Drop Spring, CPP Front and Rear Sway Bars/DJM Flip, new General Spring KC 5 spring pack, HEI /IntReg Alt 20x8.5 OldSkools 5" BS, 275/45 Falkens |
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#4 |
Old Skool Club
![]() Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: 1971 Original Front Disc Brakes?
1.215....is that stamped into the disc somewhere? If so, that should be the minimum thickness. If you measured 1 1/8th, then that would be 1.125, which would tell me that they have been over-cut or turned too many times, and are too thin.
As for the distance between studs, don't measure adjoining studs. Instead, measure the distance center-to-center of two studs with one stud between. In essence, when you tighten up your lug nuts and you tighten opposite nuts....well, that's the way you pick two to measure. Don't measure across the dust cap, tho. It'll throw you off. Or, you could go by a parts store and ask them for a guage. They're usually paper and are free.
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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. |
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#5 |
Registered User
Join Date: Sep 2012
Location: Columbia, SC
Posts: 549
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Re: 1971 Original Front Disc Brakes?
Thanks! Time for new rotors before anything else!
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__________________
Life is too long to go slow... ![]() 71 GMC 1500 Super Custom LWB 350/350 AC(replaced w/vintage air)/PS/PB 2.5 CPP Spindle, 1" CPP Drop Spring, CPP Front and Rear Sway Bars/DJM Flip, new General Spring KC 5 spring pack, HEI /IntReg Alt 20x8.5 OldSkools 5" BS, 275/45 Falkens |
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