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#686189 - Thu Oct 14 2010 08:08 PM Re: Single wheel AD rear axle swap: GM 14 bolt. [Re: Grigg]  
lostmy47  Offline
Shop Shark
Joined: May 2005
Posts: 255
San Jose, CA
SO I just found a CC truck.. its an SRW though from the photos.... think its a van axle?
I'm waiting on a call from the guy...

Jeremy


1950 Chevy 3800 1-Ton Long Bed
In the Stovebolt Gallery
More pix on Flickr

Sold all the bikes, leaving California behind.


#686209 - Thu Oct 14 2010 09:24 PM Re: Single wheel AD rear axle swap: GM 14 bolt. [Re: lostmy47]  
Grigg  Offline
Joined: May 2005
Posts: 8,995
Lexington, VA
This swap works if you start with a newer 14 bolt Dual Rear wheel axle from a cab and chassis. then you install single rear wheels on it.
It will not work if you start with a single rear wheel axle, well not and fit the wheels under fenders on a step side pickup bed..

Grigg


1951 GMC 250 in the Project Journals
1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-

#686350 - Fri Oct 15 2010 05:00 AM Re: Single wheel AD rear axle swap: GM 14 bolt. [Re: Grigg]  
lostmy47  Offline
Shop Shark
Joined: May 2005
Posts: 255
San Jose, CA
OK that's what I thought. I'd never seen a CC with single rear wheels. Thanks.


1950 Chevy 3800 1-Ton Long Bed
In the Stovebolt Gallery
More pix on Flickr

Sold all the bikes, leaving California behind.

#723208 - Tue Feb 22 2011 02:08 AM Re: Single wheel AD rear axle swap: GM 14 bolt. [Re: Grigg]  
Grigg  Offline
Joined: May 2005
Posts: 8,995
Lexington, VA
Back to the 14 bolt rear axle swap for an AD truck.

Originally Posted By Grigg
The 14 bolt Cab and Chassis axle I have has 13" x 3.5" brakes for dual wheels. Drums I think are NAPA # NB 4401652
Napa # NB 4401651 is a single wheel drum with the same brake size.

To use the single wheel brake the backing plate will need about a 1-5/16" spacer between it and the bracket on the axle tube. Which gives this much more room between springs and backing plate.

One problem may be the two different drums in question mount differently. The single wheel drum is intended to slip over the hub, and the dual wheel drum is installed on the hub then the whole assembly is installed on the axle.
I expect that the single wheel drum can be installed first just like the dual wheel one was.

Grigg


I think I'll use single wheel drums and make new backing plate mounting flanges and weld them to the axle tubes in the proper place. That will make plenty of room for springs and u-bolts.

It'll be a while before I do this, but now having had plenty of time to think about it that's where I stand on the thought process.

Grigg


1951 GMC 250 in the Project Journals
1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-

#752515 - Mon Jun 06 2011 09:21 PM Re: Single wheel AD rear axle swap: GM 14 bolt. [Re: Grigg]  
ClemSparks  Offline
New Guy
Joined: May 2011
Posts: 1
Columbia MO
I'm curious (as a new owner of a '50 GMC 250 with no bed on it) if a Cab and Chassis rear end WITH dual rear wheels would fit...considring that I'd then plan to use a flatbed.

I think if the drums will clear the springs and chassis, that the tires will to...but I'd like to know what you all think.

I'd prefer the narrower overall width of the C&C rear end if it will fit.

Thanks!
Clem


1950 GMC 1 Ton

#752538 - Mon Jun 06 2011 11:51 PM Re: Single wheel AD rear axle swap: GM 14 bolt. [Re: ClemSparks]  
Grigg  Offline
Joined: May 2005
Posts: 8,995
Lexington, VA
I believe I give the WMS measurement, and if you know the depth of your wheels and width over the springs you'll have a pretty good answer.
I'll check sometime if I get a chance, or let us know what you find.

Grigg


1951 GMC 250 in the Project Journals
1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-

#822527 - Fri Feb 03 2012 02:58 PM Re: Single wheel AD rear axle swap: GM 14 bolt. [Re: Grigg]  
Grigg  Offline
Joined: May 2005
Posts: 8,995
Lexington, VA
Bringing this thread back to the top.

Haven't made any progress on the swap...
However I have been thinking about it a lot and decided that making spacers for the backing plates to move them out and allow for mounting the original drums outboard of the hub is pretty simple and not a bad solution. This will give plenty of room for U-bolts between the spring and backing plates.

A more expensive version of that is buy single wheel brake drums of the same shoe width and diameter, then make and weld new backing plate mounting flanges in the appropriate spot on the axle (use original backing plates/brakes). If you already had to buy new drums this is the cleaner approach. Because of the distance the backing plate moves it's probably not a good idea to make a simple spacer.... it should be welded in place.

Grigg


1951 GMC 250 in the Project Journals
1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-

#1102425 - Wed May 13 2015 04:28 AM Re: Single wheel AD rear axle swap: GM 14 bolt. [Re: Grigg]  
Blind1968  Offline
Shop Shark
Joined: Jan 2015
Posts: 201
Missouri
Grigg,
How did the axle swap go? I have been looking for a 14 bolt for my 1-ton. I found a few but but really dont know what Im looking for other than 14 bolt dual from a C&C. I found two that meet my with requirement of 63". They both seem to have the same casting number.
http://i1062.photobucket.com/albums/t492...zpsauscpole.jpg

http://i1062.photobucket.com/albums/t492...zpsjphxxqbh.jpg

the drums just look awful big compared to the stock HO72 drums..


1949-52 Chevy 3800 1-Ton Flatbed
In the Stovebolt Gallery
More pix on Photobucket

#1102474 - Wed May 13 2015 02:16 PM Re: Single wheel AD rear axle swap: GM 14 bolt. [Re: Grigg]  
Grigg  Offline
Joined: May 2005
Posts: 8,995
Lexington, VA
I can't help you with the casting numbers, but it otherwise sounds like you've found what you need in one or both of those axles.

Yes, the drums are large and that's a good thing, they'll work well.

Only downside to the drums and being so deep (originaly for dual wheels) is you'll see a lot of the drums from the rear, the single wheels won't cover them.
If you can live with this then only modification that I know of to make it fit your truck is moving the spring pads to match the springs.
If you don't like that look then you can keep the very same backing plate and shoes and purchase new drums intended for a single wheel truck. To make this work you will also need to remove and relocate, or better yet, make/buy new flanges to weld to the axle for the backing plates.

Or there are ready made disc brake brackets and parts list for which rotors and calipers to buy. The downside to this is loss of parking brake in the wheels if you had those. If you do want disc and parking brake they make calipers that do but they're expensive. With disc in the rear you shuld really have them in the front as well. And lastly I'm not sure if the disc are any better than those huge drum brakes?

I know it's been several years now but I have not made progres on this swap myself. Life happens as they say.
However I have not given up and all my parts and pieces are dry and safe waiting for the right oportunity to use them.

Grigg


1951 GMC 250 in the Project Journals
1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-

#1102537 - Wed May 13 2015 10:39 PM Re: Single wheel AD rear axle swap: GM 14 bolt. [Re: Grigg]  
Blind1968  Offline
Shop Shark
Joined: Jan 2015
Posts: 201
Missouri
Thanks again Grigg, I did some research on the web and best I can tell those casting numbers check back to the 14 bolt c&c 10.5 free floating rear end. So I think I am going to go with it. being my truck is a flat bed I wonder if the dual's (original to the axle) would fit back on there after the axle is mounted (as an option).

Last edited by Blind1968; Wed May 13 2015 11:25 PM.

1949-52 Chevy 3800 1-Ton Flatbed
In the Stovebolt Gallery
More pix on Photobucket

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Moderated by  Grigg 

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