68 c30 to discs ?s - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*low&slow* · 03-30-2014, 01:27 AM

I checked out the suspension faq area on how to do this conversion and it confused me, so I thought I'd just ask.

I have a 71/2 3/4 ton with disc brakes on the front and I want to put them on a 68 c30.

Is it possible to keep the cross member and control arms on the 68 and use the spindles, ball joints, tie rod ends, ect from the 71/2?

Or do I need to use the control arms off the 71/2 as well?

mud.man.rj · 03-30-2014, 01:29 AM

I believe someone mentioned before no, the ball joints are different, not sure on the rest.

**kwmech** · 03-30-2014, 01:55 AM

X-member and control arms are the same, but the ball joints and all the tie rod ends are different as well as the center link. When they went to disc brake, they made the tapers different on the ball joints and ends along with the thread size on the tie rods

*low&slow* · 03-30-2014, 01:57 AM

Quote:

Originally Posted by kwmech

X-member and control arms are the same, but the ball joints and all the tie rod ends are different as well as the center link. When they went to disc brake, they made the tapers different on the ball joints and ends along with the thread size on the tie rods

So I have to take everything off the 71/2 minus the x-member and control arms and put all that on the 68 control arms and it will work?

SS Tim · 03-30-2014, 02:24 AM

http://67-72chevytrucks.com/vboard/s...68&postcount=4

Use the heavier parts from the later front end if at all possible. The factory did not beef up the steering gear to save money!

*low&slow* · 03-30-2014, 02:33 AM

Quote:

Originally Posted by SS Tim

http://67-72chevytrucks.com/vboard/s...68&postcount=4

Use the heavier parts from the later front end if at all possible. The factory did not beef up the steering gear to save money!

So I need to take off everything except for the x-member and control arms from the 71/2?

**WIDESIDE72** · 03-30-2014, 08:16 AM

Much easier to swap the complete crewmembers,Imo. Also, an fyi your 68 has 1/2" lug stud and the 71+ will have 9/16", so you will have mismatched sizes that need t o be kept separate unless you swap the axle, or re drill.

Not a major issue, just thought I'd point it out. I have a similar issue from when I swapped a 8.5" GN axle I to my 79 Malibu. The rears are metric and fronts standard. I planned to fix it with a b body spindle and camaro 1le rotor swap, but haven't gotten a "round two it" yet, mainly do to the high priced upper control arms needed for the swap.

03-30-2014, 01:27 AM	#1
low&slow Account Suspended Join Date: Jan 2009 Location: Kuna, Idaho Posts: 1,046	68 c30 to discs ?s I checked out the suspension faq area on how to do this conversion and it confused me, so I thought I'd just ask. I have a 71/2 3/4 ton with disc brakes on the front and I want to put them on a 68 c30. Is it possible to keep the cross member and control arms on the 68 and use the spindles, ball joints, tie rod ends, ect from the 71/2? Or do I need to use the control arms off the 71/2 as well? Last edited by low&slow; 03-30-2014 at 01:34 AM.

03-30-2014, 01:29 AM	#2
mud.man.rj Registered User Join Date: Dec 2011 Location: Creighton Sask. Canada Posts: 4,121	Re: 68 c30 to discs ?s I believe someone mentioned before no, the ball joints are different, not sure on the rest. __________________ 1987 Green n Green machine. 5.0 4spd std. 7" lift w 35's.

03-30-2014, 01:55 AM	#3
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,504	Re: 68 c30 to discs ?s X-member and control arms are the same, but the ball joints and all the tie rod ends are different as well as the center link. When they went to disc brake, they made the tapers different on the ball joints and ends along with the thread size on the tie rods

03-30-2014, 02:24 AM	#5
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,503	Re: 68 c30 to discs ?s http://67-72chevytrucks.com/vboard/s...68&postcount=4 Use the heavier parts from the later front end if at all possible. The factory did not beef up the steering gear to save money! __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

03-30-2014, 08:16 AM	#7
WIDESIDE72 Senior Member Join Date: Aug 2008 Location: Cedar Park, Texas Posts: 7,494	Re: 68 c30 to discs ?s Much easier to swap the complete crewmembers,Imo. Also, an fyi your 68 has 1/2" lug stud and the 71+ will have 9/16", so you will have mismatched sizes that need t o be kept separate unless you swap the axle, or re drill. Not a major issue, just thought I'd point it out. I have a similar issue from when I swapped a 8.5" GN axle I to my 79 Malibu. The rears are metric and fronts standard. I planned to fix it with a b body spindle and camaro 1le rotor swap, but haven't gotten a "round two it" yet, mainly do to the high priced upper control arms needed for the swap.



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