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11-21-2018, 11:20 AM | #1 |
Registered User
Join Date: Nov 2018
Location: Albuquerque, NM
Posts: 17
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‘74 C-30 Dually Front Suspension Questions
Hi all, first post to the site, came to the forums because I can’t find answers to the questions I have. Guess that’s what I get for “needing” a dually. Anyways, let’s jump into it. Truck in question is a ‘74 C-30 dually longbed that originally had the 350 and a “four” speed.
1) What differences are there between the C-30 and C-10 front suspension member? How different are the control arms? 2) Do I need to shorten/modify the front suspension member to lay the truck flat on rails, or will control arms and drop spindles handle it? It seems that the front member sticks down too far to set the truck flat. 3) Any resources for or members here that fabricate custom control arms? I’m looking for something a little different. |
11-21-2018, 06:33 PM | #2 | |
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Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,066
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Re: ‘74 C-30 Dually Front Suspension Questions
Quote:
The upper control arms on a 74 C30 are like pre-73 C10's utilizing the rubber lined steel bushing. Ball joints are interchangeable. The lower arms are also like pre-73 C10's as far as the bushings but utilize a larger OD lower BJ so they're not interchangeable. What specifically are you wanting as far as modified a-arms?
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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11-21-2018, 10:56 PM | #3 |
Registered User
Join Date: Nov 2018
Location: Albuquerque, NM
Posts: 17
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Re: ‘74 C-30 Dually Front Suspension Questions
Re: Pancaked x-member
This is the process of cutting and raising the bottom of the stock front member, correct? Re: Modified a-arms and springs/spindles I’m looking for a 3” wider/3” lower arm with a bag bracket, and will then install a 3” drop spindle. By my college drop-out math, it should ride comfortably at the correct height, maintain usable wheel angle (fenders will be modified as well) and lay on the ground or very close to it. |
11-22-2018, 12:15 AM | #4 | |
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Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,066
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Re: ‘74 C-30 Dually Front Suspension Questions
Quote:
I'm guessing your plan is to run 3/4 ton hubs & longer arms to allow dialing in dimensions for some shaved 10-lugs (thus the need for longer/custom arms)? My dually has a 1.5 pancaked/sectioned x-member, 3" spindles, & bags. It plants the front x-member & frame rails firmly on the ground when air'd out. It rides like a stock height truck. I do have aftermarket front inner wheel tubs & step notch w/raised floor/tubs in the rear. Nothing hits @ all. At ride height..... Front is 26" @ the center of the wheel well lip w/a ~30"OD front tire. Rear is 27" @ the same spot w/a 31.5"OD tire. Frame rails are about 4.5-ish inches off the ground under the center of the cab.
__________________
67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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11-22-2018, 01:31 AM | #5 |
Registered User
Join Date: Nov 2018
Location: Albuquerque, NM
Posts: 17
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Re: ‘74 C-30 Dually Front Suspension Questions
Exactly the plan, exactly the answers I needed. I appreciate it!
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1974 C30 Dually Longbed Diesel swap- Not finished Airbags- Not finished Rust- Extensive and ongoing Offensive stickers- Many |
11-22-2018, 02:18 PM | #6 |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,066
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Re: ‘74 C-30 Dually Front Suspension Questions
I'd suggest Lowboy Motorsports but it appears you already have according to IG
__________________
67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
11-22-2018, 04:41 PM | #7 |
Registered User
Join Date: Nov 2018
Location: Albuquerque, NM
Posts: 17
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Re: ‘74 C-30 Dually Front Suspension Questions
You can still suggest them, I was unaware they may be a good source for something like that. Thanks!
Side note: oh god if you’ve seen my IG you’ve seen the shape the Chevy is in
__________________
1974 C30 Dually Longbed Diesel swap- Not finished Airbags- Not finished Rust- Extensive and ongoing Offensive stickers- Many |
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air bags, control arm, dually, slammed, suspension |
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