J10 & GW Rear Brakes

[Sgt. Dave]

While looking up some brake parts, I noticed that the GW shows 11" X 2" rear shoes and drums, but the J10 shows both 11" x 2" and 12" x 2 1\2" rear shoes and drums. Aren't the rear axles the same? Was the 12" brake a heavy duty option for the J10? Just another question in my never ending quest for better brakes.

[HeavyMetal]

The other guys will correct me if I'm wrong but I think the 12 inchers are for the 8 lug dana 60 J20's

[Sgt. Dave]

I wondered about that, but it showed up as a J10 option. Anybody got a Factory Shop Manual to see if they showed it?

[Tubro]

I'm guessing I have 12 inch drums on the back of my J10. I bought brakes for for the J10 and they were way to small. I figured they were the small ones. I had to go to NAPA to get them as a few other shops didn't show up in the computer. I don't know, maybe it was an option or something. My wag has smaller drums, can tell just by looking.

[Sgt. Dave]

Unless I'm not doing my math correctly, wouldn't the 12" option work out to something in the order or 73% larger brake area? It would be a significant brake improvment

[joe]

<BLOCKQUOTE>quote:</font><HR>Originally posted by Sgt. Dave:
I wondered about that, but it showed up as a J10 option. Anybody got a Factory Shop Manual to see if they showed it?<HR></BLOCKQUOTE>
The 74-83 factory TSM's show the 11x2 brakes for the J-10's and the 12x2.5,s on the J-20's.

[Tubro]

I guess the parts monkey probaly gave me brakes for a CJ I bet, with AMC20. I need to go check.