j10 brakes?

Happened to be walking through the local wrecking yard, noticed that they had a 1972 j10 with all four drums still on the axles. Am looking to do the 11" upgrade. Three questions: Are these 11" brakes, will they fit my cj3b, and are there any modifications needed. The price seems right ($70 per axle) but want to make sure they are the right thing before I pull them off and pay for them.

Thank you in advance, the information found on this site has been invaluable.

 

Are you sure it's not a J-1000, J-2000, or J-3000? J-10's weren't until later I believe, I don't think they had front drums, and I believe they were 6 lug. Hopefully someone will correct me if I'm wrong.
If it is in fact a J-2000 or similar it may have 11" brakes which the fronts would work great. If it is the 5 lug version from a Dana 44 rear then the rears would work as well. If it has the Dana 60-2 rear then it most likely is a J-3000 or J-4000 and possibly a heavy duty J-2000 and would have 12" brakes front and rear. You don't want those as parts are hard to find and the drums are unavailable except used.

Basically if it has 5 lug bolt pattern and are in fact the 11" brakes then it should work fine for you.

 

Could be a J-1000, just looked at the fender badge. The door sticker was definately from 1972.

 

the 11 inch by 2 inch drums from a 47 to 62 willys one ton are a direct bolt up, no changes needed. did that to my cj3b and it stops as good as a sports car literally.

I had 3 sets of axles with those brakes, junked them last month, I was giving them away.

 

The disk brakes did not start until 1974. Prior to that, they were 5 lugs on a 5.5" circle, or 8 lugs. If they are 11" drums, as Nick writes, they should unbolt from the truck and bolt right on to a CJ. Nick is also right, the J-10 designator came later - a '72 would be a J2000 (short wb) or a J4000 (long wb). If the front and rear axles are Dana 44s, this will be a J2500 or J4500 and it will have 11" brakes.

If they are 12" drums (higher GVWR J-trucks) they will not work on your CJ. However (!) good 12"x2" drums are very very scarce and could be easily resold. Most 12" drums out there are scrap though, because they've already been turned to maximum diameter.

Also note that the J2600, J4600 and J4700 will have the Dana 60-2 5-lug rear axle, which would be worth buying for resale.

 

Went back to the yard, they are from a J2000, any problems with this? Looking to get them mid week sometime.