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09-16-2022, 05:19 PM
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#1 |
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Registered User
Join Date: Sep 2017
Location: Riverton, Manitoba
Posts: 67
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1961 differential drain plug gasket
My 61 GMC diff drain plug won't stop leaking. I tried different gaskets, copper washers and made my own plastic washers. I just obtained a 60 or 61 GMC parts truck and removed the plug to find the gaskets is deteriorated but it looks like it's made of cork. Anyone have a problem like this?
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09-16-2022, 08:09 PM
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#2 |
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Moderator
  
Join Date: Aug 2011
Location: China Spring, TX
Posts: 7,280
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Re: 1961 differential drain plug gasket
I think they were leather.
I'd find a Teflon washer.
__________________
Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? Last edited by The Rocknrod; 09-16-2022 at 11:35 PM. |
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09-19-2022, 09:21 AM
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#3 |
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Registered User
 
Join Date: Feb 2000
Location: Maquoketa, Ia/ Orr, Mn
Posts: 3,051
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Re: 1961 differential drain plug gasket
The seals were fiber- you say its the drain plug leaking but it looks like a fill plug in the cover to me. Here is one I bought for mine, there are suppliers that sell the fiber gasket separately.
https://www.classicparts.com/1934-72...ctinfo/93-223/
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'51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com Last edited by MJN; 12-06-2022 at 09:19 AM. |
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09-20-2022, 12:38 PM
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#4 | |
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Registered User
Join Date: Jan 2021
Location: Tahoe City, CA
Posts: 166
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Re: 1961 differential drain plug gasket
Quote:
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-Pickman (Mike) 1964 C10 Fleetside LWB “George” 1963 C50 “Green Machine” 2019 Silverado 2500HD My story (Welcome Page) |
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09-20-2022, 11:11 PM
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#5 |
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Registered User
Join Date: Sep 2017
Location: Riverton, Manitoba
Posts: 67
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Re: 1961 differential drain plug gasket
I asked my son to take the drain plug out of the parts truck but it looks like the fill plug in the picture. Next I'll try Teflon tape. This is getting annoying lol
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09-20-2022, 11:38 PM
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#6 |
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Registered User
Join Date: Jan 2017
Location: Los Osos Ca
Posts: 560
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Re: 1961 differential drain plug gasket
Wow, good timing on this. Was just changing oil in my HO and discovered that some old parts house fill plugs I bought years ago were flat on the sealing surface but an original I had was tapered to match the taper on the diff cover. That got me wondering what the proper gasket was. Funny how after all these years I never noticed the difference.
Thanks for the info on the Classic part. Couldn’t tell by the picture on their site if it is tapered or flat on the back. Also is the plug the same for 1/2 and 3/4 ton rears? Thanks Tom
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65 short stepside K10 292-SM420-T221 8 lug closed D44 front NoSpin HO72 4.10 rear |
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12-06-2022, 09:18 AM
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#7 |
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Registered User
Join Date: Feb 2000
Location: Maquoketa, Ia/ Orr, Mn
Posts: 3,051
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Re: 1961 differential drain plug gasket
Did you ever find what you were looking for? I actually have some NOS fill plug gaskets which I'll be posting in the parts board here shortly. They are a flat fiber gasket, GM # 3714775.
__________________
'51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com |
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