Control or "A" arm differences - The 1947 - Present Chevrolet & GMC Truck Message Board Network

pdr510 · 08-05-2009, 09:02 PM

Does anyone know what the difference is in a 71-72 1/2 ton control arm from a 3/4 ton control arm? Possible bigger shaft assembly and ball joints? Has anyone ever used 3/4 arms on a 1/2 ton?

Dino11 · 08-05-2009, 09:11 PM

nice Question

chevy_mike · 08-05-2009, 11:50 PM

The actual hole where the ball joint presses into is larger on the 3/4 ton. I believe the cross shafts are the same.

There is a write up about using 3/4 ton lower arms with 88-98 3/4 ton Light Duty (6 lug) ball joints and spindles. This allows you to convert over to disc brakes, using factory parts. Cool thing is, the '92-'98 1/2 ton (5 lug) rotors fit these spindles as well, so you can have either 5 or 6 lug (or change at a later date) and only have to change the rotors.

The upper a-arm you can use but change the ball joint over to the year spindle you use. I think I have the link at work, I can post it up tomorrow.

08-05-2009, 09:02 PM	#1
pdr510 Junior Member Join Date: Oct 2005 Location: LA Posts: 158	Control or "A" arm differences Does anyone know what the difference is in a 71-72 1/2 ton control arm from a 3/4 ton control arm? Possible bigger shaft assembly and ball joints? Has anyone ever used 3/4 arms on a 1/2 ton? __________________ 1970 C-10 Fleet Side Gen IV 6.0 with 4L80E

08-05-2009, 09:11 PM	#2
Dino11 Registered User Join Date: Apr 2009 Location: princeton, ky Posts: 63	Re: Control or "A" arm differences nice Question __________________ 72 c-10 lwb: mild 350 , turbo 350 w shift kit, 3.73, drop spindles and rear drop springs, e-fan, relocated fuel tank, roll pan, Progressive wheels, 02 silverado buckets&console

08-05-2009, 11:50 PM	#3
chevy_mike Never Ending Projects Join Date: Jul 2006 Location: San Diego, CA Posts: 3,836	Re: Control or "A" arm differences The actual hole where the ball joint presses into is larger on the 3/4 ton. I believe the cross shafts are the same. There is a write up about using 3/4 ton lower arms with 88-98 3/4 ton Light Duty (6 lug) ball joints and spindles. This allows you to convert over to disc brakes, using factory parts. Cool thing is, the '92-'98 1/2 ton (5 lug) rotors fit these spindles as well, so you can have either 5 or 6 lug (or change at a later date) and only have to change the rotors. The upper a-arm you can use but change the ball joint over to the year spindle you use. I think I have the link at work, I can post it up tomorrow. __________________ . 1965 C10 Panel, Tiki Express http://www.67-72chevytrucks.com/vboa...d.php?t=506580 SOLD 1968 Chevy C10, Long, Fleetside, Hot Rod Hauler http://67-72chevytrucks.com/vboard/s...d.php?t=313233 SOLD 1965 Chevy C10, Long, Fleetside, Hot Rod C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415702 SOLD We were given two ears and one mouth for a reason... listen twice as much and speak half as often...



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