Re: 65 GMC Front Hub Riveted to Brake Drum
 

Millspec:
Couple of thoughts:
If you have front drums riveted, they are likely original to the truck. Surprised at how long they have lasted. I had to change one of my fronts. I found grinding the head off of the river to be the easiest way to take it apart. I believe the Chevy drums for the front will be the same as your front drums.

Rear drums are a different story. We have Dana 44 rear vs Chevy that use "corporate" rear. Our rear drums do have more offset than Chevy. When I had this problem, I found the front drums for 4 wheel drive Chevy ilate sixties used six lugs and Dana 44 in their fronts. Those drums had fins but were the closest I found for use in our rear. You can use search function and find my posts in the past on this or I can look up the part on Rock Auto if you want me to.

Hope that helps..
Regards
Steve
New Orleans

Re: 65 GMC Front Hub Riveted to Brake Drum
 

Millspec:
Looks like rear drums I mentioned are getting harder to find. Part I used was raybestos 2067r. Rock only lists one in stock. I found some more at website below.

Hope this helps.
Regards
Steve
New Orleans

Re: 65 GMC Front Hub Riveted to Brake Drum
 

Millspec:
One other thing I forgot to mention is that I had to drill holes for lugs from 1/2" to 9/16" on these drums to fit the collar that we have on our studs.
Regards
Steve
New Orleans

Re: 65 GMC Front Hub Riveted to Brake Drum
 

My 1965 manual doesn’t listed a maximum spec other than to not machine drum larger than .060 over nominal size. Now Rockauto does list a discard spec for the Chevy drum at 11.06 inches. Assuming std. size is 11 inches. Makes sense with 11x2 brake drums.

Re: 65 GMC Front Hub Riveted to Brake Drum
 

Prowbar,
I took your advice and took the drums to a local machine shop. They are all worn well past 11.06”. Three were worn past 11.085” and one was over 11.09”.
Steve,
Thank you for the information! I will look into those Dana 44 drums for the rear. Was there any problem with wheel figment due to the fins?
As for the fronts, I will have to look closer at the front drums to see if they are the same as a C10.


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Re: 65 GMC Front Hub Riveted to Brake Drum
 

Well, it was worth a try. Good luck on your quest to find new drums.

Re: 65 GMC Front Hub Riveted to Brake Drum
 

Millspec:
Fins on the drums weren't a problem. Only mod necessary was drilling lug holes to 9/16"
Regards
Steve
New Orleans

Re: 65 GMC Front Hub Riveted to Brake Drum
 

Steve,
I looked on partzilla but not seeing the Raybestos R-Line 2067R. I see one on Rockauto but need 2.
Do you have a link for the partzilla?


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Re: 65 GMC Front Hub Riveted to Brake Drum
 

Never mind. I found them. Sorry about that.


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Re: 65 GMC Front Hub Riveted to Brake Drum
 

Millspec:

Try this:

https://www.partzilla.com/product/au...hMfy9-IJBen-4E

Otherwise search " raybestos 2067r " and that should bring it up as well.

Regards
Steve
New Orleans