Lower Control Arm Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

NoNeck · 12-11-2012, 06:06 PM

Probably a dumb question, but...

Should the lower control arms ('70 GMC) be perfectly centered? For instance, the same measurement from the U-bolts to control arm face?

I have included a crude photo that might help. Think of the red lines as approximate U-bolt saddle locations.

Thanks!

**70CHEVYBB** · 12-11-2012, 07:43 PM

There is a left and a right so they are different.

**chewychevy67** · 12-11-2012, 08:15 PM

I just marked the center of the shaft and used that mark to center between the ears of the a arm. I hope thats how its done or ill be redoing mine.
Posted via Mobile Device

ERASER5 · 12-11-2012, 08:21 PM

There is a notch that locates the A-arm, but you can move the notch to gain more caster. There is a whole thread about it in the suspension forum. My caster mod or something like that. Very little work if the arms are torn down already.

**lolife99** · 12-11-2012, 08:25 PM

Quote:

Originally Posted by 70CHEVYBB

There is a left and a right so they are different.

Some of the replacement control arm shafts are double drilled/dimpled, for the frame saddle index,... so you can't put them in backwards.

12-11-2012, 06:06 PM	#1
NoNeck Registered User Join Date: Jan 2011 Location: Chattanooga, TN Posts: 1,108	Lower Control Arm Question Probably a dumb question, but... Should the lower control arms ('70 GMC) be perfectly centered? For instance, the same measurement from the U-bolts to control arm face? I have included a crude photo that might help. Think of the red lines as approximate U-bolt saddle locations. Thanks! Attached Images __________________ 2016 RAM Laramie HEMI 1966 Fairlane GT/A, 390/335 HP If it costs you a dollar to make a friend, KEEP THE DOLLAR. If it costs you a friend to make a dollar, KEEP THE FRIEND.

12-11-2012, 07:43 PM	#2
70CHEVYBB Senior Member Join Date: Feb 2012 Location: chillicothe, illinois Posts: 690	Re: Lower Control Arm Question There is a left and a right so they are different.

12-11-2012, 08:15 PM	#3
chewychevy67 Senior Member Join Date: Jan 2010 Location: Here Posts: 5,551	Re: Lower Control Arm Question I just marked the center of the shaft and used that mark to center between the ears of the a arm. I hope thats how its done or ill be redoing mine. Posted via Mobile Device

12-11-2012, 08:21 PM	#4
ERASER5 Registered User Join Date: Jun 2006 Location: Indiana Posts: 4,859	Re: Lower Control Arm Question There is a notch that locates the A-arm, but you can move the notch to gain more caster. There is a whole thread about it in the suspension forum. My caster mod or something like that. Very little work if the arms are torn down already. __________________ '70 GMC C1500 LWB Power disc brakes. WooHoo! Posi 6 Lug Dana 60



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