Ring gear size

[86454]

I have a 85 C20 Suburban, 454, w/ 3.73 gears, 8600gvwr.
I need to get some brake parts but they want to know if it is a  9.5" or 10.5" ring gear.
Since I have to order them I don't want to get the wrong parts.
Is there a way to tell which ring gear it has w/o pulling the differential cover?
The cover is about 13.5 x 13.5

[zieg85]

10.5

[86454]

Thanks for the amazingly fast response.  Four minutes has to be some sort of record. 
I figure after 250k my drums are just about due for replacement and I was trying to see how much it was going to cost me.
Seems like everything comes from China anymore. What is the best brand these days for drums? 

[zieg85]

If the drums are within specs just have them machined.  These drums are pretty pricey I would imagine.  If they have never seen metal to metal chances are they should be fine.  Good luck

[DnStClr]

According to a response on another forum, there aren't ANY brake drums made in the USA any more. All are made in China. here's the post-
http://www.355nation.net/forum/brakes/41051-no-more-usa-made-rotors-drums.html