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3800 Drum #1331470 Mon Oct 28 2019 01:05 AM
Joined: Jan 2012
Posts: 11
V
vette1968 Offline OP
New Guy
I have read about this in the manuals but would like to verify if I am understanding correctly.
Are the rear drums on 1949 one ton 3800 trucks the same for single wheel versus dual wheel ? Can the same drum be used for either ?

Re: 3800 Drum [Re: vette1968] #1331590 Mon Oct 28 2019 05:20 PM
Joined: Mar 2002
Posts: 8,912
truckernix Offline
Master Gabster
The online Chev parts manual shows different part numbers for the two models. Parts Book


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!
Re: 3800 Drum [Re: vette1968] #1331716 Tue Oct 29 2019 05:08 AM
Joined: Feb 2013
Posts: 206
E
Eureka Jim Offline
Shop Shark
I don't see 2 different numbers for the rear drum in the parts manual, '46-'52 rear wheel drum # 609808. However, the studs are different lengths for the single rear wheel trucks versus the ones that use duals. There is a difference in the front drums for those trucks that have dual rear wheels.

Re: 3800 Drum [Re: Eureka Jim] #1331730 Tue Oct 29 2019 12:12 PM
Joined: Jan 2012
Posts: 11
V
vette1968 Offline OP
New Guy
Thank you for the replies. I have a chance to buy a rear.drum but it is unclear which set up it s from. As difficult as they are to find I may just go ahead and get it.

Last edited by vette1968; Tue Oct 29 2019 12:13 PM. Reason: Typo
Re: 3800 Drum [Re: vette1968] #1331824 Tue Oct 29 2019 11:04 PM
Joined: Mar 2002
Posts: 8,912
truckernix Offline
Master Gabster
My mistake, that is the rear drum for both single and dual wheel application. I guess I was looking at the front drum. So it doesn't matter which one it was used on. Those drums are super rare so I hope that you are able to get it.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!
Re: 3800 Drum [Re: vette1968] #1331882 Wed Oct 30 2019 12:26 PM
Joined: Nov 1995
Posts: 4,266
J
John Milliman Offline
Founder/Developer
Maybe the guys with the parts books can clear this up .... Considering the HO72 axle was used for so many years ('47.2 through '72, right?), then are the drums the same for all those years or do the part numbers change?

I am scavenging brake parts off an HO72 as we speak that appears to have two different era drums on it -- one is ribbed, the other is smooth, yet they interchange. I'm assuming the smooth one is much newer (after the bean counters told the engineers to figure out a cheaper way to make them ...).

Can someone with the parts books take a look at that to see when/if the parts nos change? Maybe the part number only changes when they went from ribbed to smooth, but otherwise the drum is the same? (Two different part numbers, ribs/no ribs, yet fit/function remain identical?)

I was told by competent authority that everything throughout the run of the HO72 interchanges (i.e., that it should be a simple procedure to retro fit the Bendix brakes from a '68, for example, to a '48 -- from the backing plate out). I have not proved this to myself, though. Nor do I know anything about interchangeability between SRW and DRW axles)

Interesting.


John

'49 Chevrolet 3804

Re: 3800 Drum [Re: vette1968] #1331940 Wed Oct 30 2019 07:06 PM
Joined: Mar 2002
Posts: 8,912
truckernix Offline
Master Gabster
John, I am pretty sure that the drum changed in 53 when the Bendix style came in. It is interesting that you may have a newer drum. A few years ago I bought a set of drums new for a 38 pickup. They were made in Argentina and they are a one piece cast drum, not like the originals. This causes the center section to be thicker so the other dimensions are adjusted to make it work.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!
Re: 3800 Drum [Re: truckernix] #1333183 Sun Nov 10 2019 03:13 AM
Joined: Jan 2012
Posts: 11
V
vette1968 Offline OP
New Guy
Thanks, Truckernix. I was able to obtain the drum. As you say they are super rare. I got it primarily as a back up and will just throw it on the shelf. Keeping on the lookout for another.

I am keeping my truck entirely stock except I made the change to a 4.10 rear end. There sure is a big difference now and it is nice to be able to go around 50 or a little less and not a max speed of 42 mph.

More out of curiosity than anything I did discover a place in Illinois that resleeves old drums. It is nice to know that is an option too.

Re: 3800 Drum [Re: vette1968] #1333216 Sun Nov 10 2019 06:11 PM
Joined: Jul 2014
Posts: 139
1
1Ton_tommy Offline
Shop Shark
Vette1968

Would you post the info for the place that resleeves old drums? Or Pm me.


51 3800 PU, 55 235 (w/cam, headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.
Re: 3800 Drum [Re: 1Ton_tommy] #1333237 Sun Nov 10 2019 09:07 PM
Joined: Jan 2012
Posts: 11
V
vette1968 Offline OP
New Guy
1 Ton Tommy, I sent you a PM. Not sure about the rules of posting business names here

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