63 C10 bolt pattern change
 

I'm sure there is already an answer for this. I'm considering having my 6. Lug rear axles drilled to 5 on 5. Is there a 5 lug drum that will fit.
Thanks as always

Re: 63 C10 bolt pattern change
 

71-87 HD brake drum

Not the light duty ones

oh and you will need to have the center part of the axle turned some as well. Just take a drum with you to size them properly.

Re: 63 C10 bolt pattern change
 

Is there a Part# ?

Re: 63 C10 bolt pattern change
 

I will have to disagree on that. The '71-'87 HD brakes will have 2-3/4" wide shoes. Those will not work on an earlier truck without changing the backing plates. And on a '63 12 bolt, you can not do that as the backing plates are pressed onto the axle tubes.

What the OP will want are the '71-'87 light duty brake drums for the 2" wide shoes.

I do agree that the hub register on the axles will have to be turned down to aprox. 3.062" to fit the 5 lug drums.

Re: 63 C10 bolt pattern change
 

Just pick a year between '71-'87 and go to your parts supplier and ask for rear drums. They will ask you what size shoes and just tell them 2" wide shoes.

Re: 63 C10 bolt pattern change
 

Just curious, would HD drums & the corresponding backing plates & brake pieces fit a 64-66 rear. I plan on towing my boat & heavy loads(firewood, etc.), and HD brakes would be a bonus

Re: 63 C10 bolt pattern change
 

Thank you for the info!!!!!

Re: 63 C10 bolt pattern change
 

Thanks Captn! I stand corrected ( backwards again!)

Re: 63 C10 bolt pattern change
 

Not the simplest way for just 5-bolts, but to use the wider hd brakes also, you can make a simple(?) spacer and use longer bolts--high-grade--to move backing plates outward. Determine the sq. inches of braking surfaces of the 2 systems, and you may just be tempted to go with the hd br. system. CAVEAT: These stock diameter drums, compared to biggest acceptable diam. after re-machining, leave very little space for future turning--IIRC!!! Ie, max. re-machined diam. less original new diameter equals a very small cut--IIRC!!!

I do NOT suggest it but I know of several trucks, driven daily, which merely used NUTS over the longer bolts to extend the backing plates.

Luck to you after making nice, proper spacers!
Sam

Re: 63 C10 bolt pattern change
 

The HD brakes (2-3/4" wide shoes), backing plates will bolt right up to a '64-'82 truck 12 bolt. The backing plate flange bolt pattern is the same as well as the brake offset. In fact the brakes from a '80-'87 8.5" truck 10 bolt will bolt up as well.

I don't understand the spacer suggestion as that would move the backing plate the wrong direction.

Re: 63 C10 bolt pattern change
 

Sorry, but the spacer idea was with using '71 axles and HD backing plates/shoes in '66 models--'63 may differ. *Without the spacer, the 2 3/4 drum would not 'reach and cover' the shoes.
Sam