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

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.