source for 13" brake drums

[chronos]

I have a 86 1/2ton 2WD 'heavy half'  five lug
with I think the bigger 13" drumsHow is the measurement made for the drums?Is it inside dia. or outside?
Maybe they are not the 13" depending on that.The shoes are 2 3/4"
Does anyone have a part number for these?
Looking for RAYBESTOS part number

[VileZambonie]

On a half ton 2wd you should have 11 5/32" x 2 3/4" shoes.

You would need to measure the drum inside diameter.

Here's the GM #s .

      11 X 2 18029648
     
      11.15 X 2.75 18029663
       
      13 X 2.50 18023341 
     
      13 X 3.50 18029651

http://www.raybestos.com/wps/portal/raybestos/c1/04_SB8K8xLLM9MSSzPy8xBz9CP0os3hnbwufEBd3D2cTk-Bg_yBjCxNjAwgAykeaxfuZ-JgYO3l5B7uaBBuaBjmZBZjA5InRbebt6W_kZ2TgbuJnYWBkahng72dqZmBpaE5AdzjItZgqjBAqwPL4XAeWx22_n0d-bqp-QW5ohEFmQDoA9oAOtA!!/dl2/d1/L2dJQSEvUUt3QS9ZQnB3LzZfTjRMNDNCSktTRTRTMTVSQjlRNDAwMDAwMDA!

[VileZambonie]

http://www.autoitoolbox.com/Raybestos/Parts.aspx

Automotive
1986 Chevrolet Truck C10 
 
Description Part Number 
Brake - Brake Shoes, Rear
[Brake Shoes]
Professional Grade;11" X 2" Brakes 449PG 
[Brake Shoes]
Professional Grade;11-5/32" X 2-3/4" Brakes 473PG 
[Brake Shoes]
Service Grade;11-5/32" X 2-3/4" Brakes 473SG
 

[chronos]

Thanks Vile , I do have the 11 x 2 3/4
The 13" drums must be HUGE....lol
Thanks for the info and numbers

[malibu795]

find 13"x2.5 on alot of 3/4 trucks

13x3 was dually

[Jim Rockford]

try rock auto...

[Flamingbig10]

napa has them to