Inboard vs Outboard Brake Drums (70 CJ5) - JeepForum.com
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Unread 04-24-2013, 08:38 PM   #1
jco6560
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1970 CJ5 
 
Join Date: Jan 2013
Location: Denver, CO
Posts: 30
Inboard vs Outboard Brake Drums (70 CJ5)

Anyone know when Jeep switched to 'outboard' brake drums (mounted outside the wheel hub)? I have a 70 CJ5 with 10 inch outboard drums, but not sure if that is original. I believe the 10 inch drums were factory option with V6 225 by 1970, whereas a lot of the Kaiser era jeeps for the mid-60's used inboard 9 inch drums. Were 10 inch inboards ever used or is that when the switch to outboards occurred?

As usual thanks for all the input - James

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Unread 04-24-2013, 08:45 PM   #2
jco6560
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Additional Info

These would be on the stock Dana 27 front axle with closed knuckles.
-thanks
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Unread 04-25-2013, 06:57 AM   #3
colojeepguy
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1970 CJ5 
 
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V6 CJ's did come with 10" brakes stock
If you want a cheap & easy upgrade, get some 11" drums & backing plates from a 72-75 CJ.
Easy swap, better brakes, and parts are much cheaper & easier to find.
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Unread 04-25-2013, 08:27 AM   #4
jco6560
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1970 CJ5 
 
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Seems like the few times I've looked into doing an 11inch drum swap, I run into some complications - its not just a straight swap out. Did the AMC 72-75 jeeps use the same Dana 27 or did they go to the Dana 30? I also think that is when open knuckle came around, so the 72-75 backing plate is different and won't work with the closed knuckle on the Dana 27. I could be wrong about all of this...

For this particular 70 CJ, I am trying to keep very original and I am not overly disappointed with the 10 inch drums so far (I only run 31s). So...where the factory 10 inch drums for the V6 outboard? All the older 9 inch drums were inboard that I have seen?
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Unread 04-25-2013, 08:29 AM   #5
CSP
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The '72-75 did use the Dana 30. The 11" drums can be used on the Dana 27. I donated them from my '75 to a guy that installed them on a Dana 27. I don't know the details of the swap, but I know it was successful.
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brakes , cj-5 , drums

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