Changing from drum to disc in front - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Blue85 · 11-07-2004, 03:24 AM

when u change over from drum to disc brakes can you just bolt on the disc brake spindles to the original a arms or do you have to change the a arms as well?

**GMCPaul** · 11-07-2004, 04:53 AM

If using 63-70drop or stock height disc brake conversion spindles you don't need to change anything, if using 71 up spindles unbolt the entire crossmember with a-arms and all steering parts attached up to and including the pitman arm and roll it out from under the donor vehicle then do same on your truck and roll the donor under and bolt it on. Otherwise you will need to swap out upper & lower ball joints in your current a-arms for 71 up style or swap a-arms as you said and rather than unbolting everything from donor individually its much easier to do the swap as a assembly. The lower a-arm on 71 up trucks also has the brake lines to hose mounting tang attached on the front of lower a-arm on 70 and earlier this is attached at the rear of the arm.
GMCPaul

Blue85 · 11-07-2004, 01:34 PM

but the 71 ball joints will work with the old style a arms, or what?

HuggerCST · 11-08-2004, 12:09 AM

Yes, '71 ball joints will work in your old style a-arms.

SCOTI · 11-08-2004, 12:10 AM

71-72 style will work as well as 73-87 ball joints.

Blue85 · 11-08-2004, 01:46 AM

koo

11-07-2004, 03:24 AM	#1
Blue85 Oilfield Trash Join Date: Sep 2003 Location: Raymore, Sk, Canada, Earth Posts: 3,171	Changing from drum to disc in front when u change over from drum to disc brakes can you just bolt on the disc brake spindles to the original a arms or do you have to change the a arms as well? __________________ 14 Dodge 3500 Mega Cab 08 Dodge 3500 Mega Cab 87 Chev 3+3 4x4 80 GMC K10 High Sierra bone stock 70 Chevelle 350SS long term project 68 GMC 3ton Grain Truck/Garbage wagon 50 Pontiac 2 Door Coupe Project "I've got a shotgun rifle and a 4 wheel drive and a country boy can survive" Hank Jr.

11-07-2004, 04:53 AM	#2
GMCPaul Senior Member Join Date: Mar 2000 Location: Rockville,In. USA Posts: 3,719	If using 63-70drop or stock height disc brake conversion spindles you don't need to change anything, if using 71 up spindles unbolt the entire crossmember with a-arms and all steering parts attached up to and including the pitman arm and roll it out from under the donor vehicle then do same on your truck and roll the donor under and bolt it on. Otherwise you will need to swap out upper & lower ball joints in your current a-arms for 71 up style or swap a-arms as you said and rather than unbolting everything from donor individually its much easier to do the swap as a assembly. The lower a-arm on 71 up trucks also has the brake lines to hose mounting tang attached on the front of lower a-arm on 70 and earlier this is attached at the rear of the arm. GMCPaul __________________ Secure Online Catalog for-GMCPauls Truck Parts Email- GMCPAULS@GMAIL.COM

11-07-2004, 01:34 PM	#3
Blue85 Oilfield Trash Join Date: Sep 2003 Location: Raymore, Sk, Canada, Earth Posts: 3,171	but the 71 ball joints will work with the old style a arms, or what? __________________ 14 Dodge 3500 Mega Cab 08 Dodge 3500 Mega Cab 87 Chev 3+3 4x4 80 GMC K10 High Sierra bone stock 70 Chevelle 350SS long term project 68 GMC 3ton Grain Truck/Garbage wagon 50 Pontiac 2 Door Coupe Project "I've got a shotgun rifle and a 4 wheel drive and a country boy can survive" Hank Jr.

11-08-2004, 12:09 AM	#4
HuggerCST Registered User Join Date: Jul 2001 Location: North Louisiana Posts: 4,501	Yes, '71 ball joints will work in your old style a-arms. __________________ Wynne 70 CST short fleet Hugger orange & white, 350/350, ps, pb, air, tilt, tach/vac/speedwarning, original buckets, AM/FM, oak bed floor, shoulder belts, 3.5"/5.5" drop, 20" American Racing VN425s. Build thread 53 Chevy shortbed 69 Camaro Click here to subscribe Chevy GMC International Truck Club Louisiana Charter Member http://www.louisianaclassictruckclub.com

11-08-2004, 12:10 AM	#5
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 21,947	71-72 style will work as well as 73-87 ball joints. __________________ 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.*

11-08-2004, 01:46 AM	#6
Blue85 Oilfield Trash Join Date: Sep 2003 Location: Raymore, Sk, Canada, Earth Posts: 3,171	koo __________________ 14 Dodge 3500 Mega Cab 08 Dodge 3500 Mega Cab 87 Chev 3+3 4x4 80 GMC K10 High Sierra bone stock 70 Chevelle 350SS long term project 68 GMC 3ton Grain Truck/Garbage wagon 50 Pontiac 2 Door Coupe Project "I've got a shotgun rifle and a 4 wheel drive and a country boy can survive" Hank Jr.



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