'67 C-30 Frame & Suspension - The 1947 - Present Chevrolet & GMC Truck Message Board Network

A-J · 06-20-2011, 12:57 PM

Hi everyone

I've been reading on the forum for a couple of weeks now and I can't quite seem to find much info for what I'd like to do (if possible). This is my first truck project and the goal is to lower the dually a significant amount WITHOUT bags and retain the bed load capacity. I don't know for certain, but perhaps 8" in the rear & 6" in the front.

Most articles I see deal with airbags when it comes to the frame. What are some of the methods I can use to lower the rear of the frame without bags? I know there's C-Notching, leaf spring flips, and I've seen people "Z" the frame. What's my first step with regards to this decision? Do I determine my exact ride height that I'm looking for? I've attached a picture of the truck.

~ AJ

A-J · 06-21-2011, 05:10 PM

Too vague of a question..?

SCOTI · 06-21-2011, 06:50 PM

Drop spindles & shorter drop springs up front. Flip the rear on top of the leafs in the rear. This should get you around a 5" front/7" rear drop.

A-J · 06-22-2011, 12:19 AM

So we're not talking re-engineering the rear suspension so much as re-locating..?

SCOTI · 06-22-2011, 10:09 AM

Quote:

Originally Posted by A-J

So we're not talking re-engineering the rear suspension so much as re-locating..?

Anything can be done. But the simple flip kit yields x" of drop (x = 1/2 the dia of the axle tube plus the height of the spring pack). It's still going to ride like an old C30 though. To get drop & improve ride quality is where air ride shines....

**N2TRUX** · 06-22-2011, 10:24 AM

Welcome to the forum A-J. What your asking for is kind of a "have your cake and eat it too" scenarios. Trying to radically lower your truck, improve the ride "and" maintain it load capacity can be a complex request.

As Scoti mentioned, standard lowering techniques will get you down. If you want a better ride you will need to loose some the your load capacity, or add air suspension. Your best solution is a combination of all of those elements.

A-J · 06-22-2011, 01:23 PM

I can deal with poor ride quality. I've built some imports (Sorry..!!) over the years that almost required a kidney belt for trips longer than 10 minutes. I'd for-go some of the bed capacity if need be. My goal would be throwing a couple of Harley's on the back. Gosh, I'm so new to trucks I don't even know my bed capacity stock. My books haven't show up from UPS yet. LOL

71swb4x4 · 06-22-2011, 01:29 PM

Flipping the axle may severely diminish your load capacity without an extreme notch. My 67 has a huge spring pack, and if I flip it I am not sure I will get much weight on it before I am hitting the frame.
You will probably need a combination in the back. Maybe pulling some leafs, adding air bags as "helpers" and a notch.

A-J · 06-22-2011, 05:30 PM

Can someone show me a good example of a flip-kit..?

06-20-2011, 12:57 PM	#1
A-J Registered User Join Date: May 2011 Location: Over Here Posts: 7	'67 C-30 Frame & Suspension Hi everyone I've been reading on the forum for a couple of weeks now and I can't quite seem to find much info for what I'd like to do (if possible). This is my first truck project and the goal is to lower the dually a significant amount WITHOUT bags and retain the bed load capacity. I don't know for certain, but perhaps 8" in the rear & 6" in the front. Most articles I see deal with airbags when it comes to the frame. What are some of the methods I can use to lower the rear of the frame without bags? I know there's C-Notching, leaf spring flips, and I've seen people "Z" the frame. What's my first step with regards to this decision? Do I determine my exact ride height that I'm looking for? I've attached a picture of the truck. ~ AJ

06-21-2011, 05:10 PM	#2
A-J Registered User Join Date: May 2011 Location: Over Here Posts: 7	Re: '67 C-30 Frame & Suspension Too vague of a question..?

06-21-2011, 06:50 PM	#3
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,082	Re: '67 C-30 Frame & Suspension Drop spindles & shorter drop springs up front. Flip the rear on top of the leafs in the rear. This should get you around a 5" front/7" rear drop. __________________ 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.*

06-22-2011, 12:19 AM	#4
A-J Registered User Join Date: May 2011 Location: Over Here Posts: 7	Re: '67 C-30 Frame & Suspension So we're not talking re-engineering the rear suspension so much as re-locating..?

06-22-2011, 10:24 AM	#6
N2TRUX Happy to be here Join Date: Mar 2000 Location: Cypress, TX Posts: 39,021	Re: '67 C-30 Frame & Suspension Welcome to the forum A-J. What your asking for is kind of a "have your cake and eat it too" scenarios. Trying to radically lower your truck, improve the ride "and" maintain it load capacity can be a complex request. As Scoti mentioned, standard lowering techniques will get you down. If you want a better ride you will need to loose some the your load capacity, or add air suspension. Your best solution is a combination of all of those elements. __________________ Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra"

06-22-2011, 01:23 PM	#7
A-J Registered User Join Date: May 2011 Location: Over Here Posts: 7	Re: '67 C-30 Frame & Suspension I can deal with poor ride quality. I've built some imports (Sorry..!!) over the years that almost required a kidney belt for trips longer than 10 minutes. I'd for-go some of the bed capacity if need be. My goal would be throwing a couple of Harley's on the back. Gosh, I'm so new to trucks I don't even know my bed capacity stock. My books haven't show up from UPS yet. LOL

06-22-2011, 01:29 PM	#8
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	Re: '67 C-30 Frame & Suspension Flipping the axle may severely diminish your load capacity without an extreme notch. My 67 has a huge spring pack, and if I flip it I am not sure I will get much weight on it before I am hitting the frame. You will probably need a combination in the back. Maybe pulling some leafs, adding air bags as "helpers" and a notch. __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.

06-22-2011, 05:30 PM	#9
A-J Registered User Join Date: May 2011 Location: Over Here Posts: 7	Re: '67 C-30 Frame & Suspension Can someone show me a good example of a flip-kit..?



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