67-72 C/10 Lower A-Arm Differences - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72step · 01-21-2003, 07:26 PM

What's the difference in lower A-arms?

minibike · 01-21-2003, 07:38 PM

I'm not sure there is a difference. The ball joints changed in 71. I put the 71 ball joints in my 69 a-arms without any problem. The bushings are the same part number between 69 and 71.

**john** · 01-21-2003, 07:44 PM

I am curious too. I have read posts where some turning radius is lost with dics spindles on older trucks. Anyone know?

jostrans68 · 01-21-2003, 08:06 PM

The stops are different so the radius is shorter I just cut mine to match the newer one as I had it together before I found Out .. Good Luck

crazy longhorn · 01-21-2003, 08:11 PM

I have 71 lower arms on my 69, so I havent run into the problem myself........but have talked with several guys that have. The 71-up balljoints will fit in the 67-70 arms, but the steering stops differ & will shorten the turning radius. If you have the truck assembled, you can grind the stops on the spindles, or modify the stops on the arms. Good luck....crazyL

72step · 01-22-2003, 11:34 AM

Anyone have any further info or pics. The thing is I have access to an A-arm off a pre-71, and I will be able to do any necessary adjustments to the arm while it's off. I'd appreciate any further info I can get on this........Thanks

72step · 01-22-2003, 02:42 PM

ANYONE??

Truckstr · 01-22-2003, 03:00 PM

I don't have any pics, but I'll have to go along with what crazylonghorn had to say on the subject.

This much I do know. My '72 LWB truck (all factory front disc/rear drum) has a much tighter turning radius than my '67 SWB truck (presently 6-lug, 4 wheel drum brakes).

I couldn't vouch for what lower A-arms that the '67 has on it.

I WILL be changing out the front suspension in favor of that off of a '72 plus adding ECE drop spindles and front anti-sway bar - real soon.

From what I've been able to gather the length of the upper and lower A-arms are the same from '67 to '72. The ball joints did change in either '71 or '72 but will still mount right into older A-arms without modding.

The difference is, therefore, the steering stops.

Don't know if I added anything, but I can hope.

Jeff

72step · 01-22-2003, 04:06 PM

Thanks truckstr! I will remove my old one, and take it with me to the junkyard and see what matches.

01-21-2003, 07:26 PM	#1
72step Registered User Join Date: Nov 2000 Location: chimayo, nm, usa Posts: 898	67-72 C/10 Lower A-Arm Differences What's the difference in lower A-arms?

01-21-2003, 07:38 PM	#2
minibike Registered User Join Date: Jun 2002 Location: Lafayette, LA Posts: 500	I'm not sure there is a difference. The ball joints changed in 71. I put the 71 ball joints in my 69 a-arms without any problem. The bushings are the same part number between 69 and 71. __________________ 69 SWB LT1/4L60E www.classicplace.com

01-21-2003, 07:44 PM	#3
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	I am curious too. I have read posts where some turning radius is lost with dics spindles on older trucks. Anyone know? __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

01-21-2003, 08:06 PM	#4
jostrans68 Jostrans68 Join Date: Mar 2001 Location: Bloomington indiana Posts: 1,182	The stops are different so the radius is shorter I just cut mine to match the newer one as I had it together before I found Out .. Good Luck __________________ [CGTW Member former 67-72 now with a 96 silverado

01-21-2003, 08:11 PM	#5
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	I have 71 lower arms on my 69, so I havent run into the problem myself........but have talked with several guys that have. The 71-up balljoints will fit in the 67-70 arms, but the steering stops differ & will shorten the turning radius. If you have the truck assembled, you can grind the stops on the spindles, or modify the stops on the arms. Good luck....crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

01-22-2003, 11:34 AM	#6
72step Registered User Join Date: Nov 2000 Location: chimayo, nm, usa Posts: 898	Anyone have any further info or pics. The thing is I have access to an A-arm off a pre-71, and I will be able to do any necessary adjustments to the arm while it's off. I'd appreciate any further info I can get on this........Thanks

01-22-2003, 02:42 PM	#7
72step Registered User Join Date: Nov 2000 Location: chimayo, nm, usa Posts: 898	ANYONE??

01-22-2003, 03:00 PM	#8
Truckstr Registered User Join Date: Nov 2002 Location: Lebanon, Tennessee Posts: 1,372	I don't have any pics, but I'll have to go along with what crazylonghorn had to say on the subject. This much I do know. My '72 LWB truck (all factory front disc/rear drum) has a much tighter turning radius than my '67 SWB truck (presently 6-lug, 4 wheel drum brakes). I couldn't vouch for what lower A-arms that the '67 has on it. I WILL be changing out the front suspension in favor of that off of a '72 plus adding ECE drop spindles and front anti-sway bar - real soon. From what I've been able to gather the length of the upper and lower A-arms are the same from '67 to '72. The ball joints did change in either '71 or '72 but will still mount right into older A-arms without modding. The difference is, therefore, the steering stops. Don't know if I added anything, but I can hope. Jeff __________________ Jeff '67 short Fleet; my ongoing project. '66 long Fleet; my original "baby." Live life or bust trying.

01-22-2003, 04:06 PM	#9
72step Registered User Join Date: Nov 2000 Location: chimayo, nm, usa Posts: 898	Thanks truckstr! I will remove my old one, and take it with me to the junkyard and see what matches.



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