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Rear brake drum size

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Old 04-22-2016, 11:23 AM
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Default Rear brake drum size

Question fellow jeepers which is more common 9" or 10" drums
Old 04-22-2016, 06:17 PM
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how to determine which one u have messsure inside to inside?
Old 04-22-2016, 07:29 PM
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XJ drums are almost all 9" AFAIK only the police and comanche D44 had 10"

measure the inside diameter of the drum
Old 04-23-2016, 03:31 AM
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And then compare the new part to the old part just for good measure
Old 04-23-2016, 09:29 AM
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Mostly 9" unless you have the police package.

the 10" drums have fins on the outside and the 9" are smooth.
Old 04-23-2016, 09:50 AM
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Fins? Lol I don't wanna sound stupid or anything but what u mean fins
Old 04-23-2016, 09:56 AM
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Originally Posted by xjcrazy0346
Fins? Lol I don't wanna sound stupid or anything but what u mean fins
Cooling fins..

The 9" is on the left and 10" on the right in this pic.

Old 04-23-2016, 01:50 PM
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Thanks man for the info. I've done a lot of work to this jeep about to get it lined out finally lol
Old 04-23-2016, 03:31 PM
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The 9" rear drums sure look wimpy. My "to do" list includes converting them to discs. Right now they're working OK so no rush, but if I had to work on the back brakes anyway I'd rather not stick with the drums.
Old 04-23-2016, 04:16 PM
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I forgot to mention,, If I remember correctly the 9" brake shoes are 2 1/2" wide and the 10" shoes are 1 3/4" wide,, maybe 2".
Old 04-24-2016, 09:51 PM
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Originally Posted by Dumajones
I forgot to mention,, If I remember correctly the 9" brake shoes are 2 1/2" wide and the 10" shoes are 1 3/4" wide,, maybe 2".
actually. There's two widths of 10" drums. D35 10" drums are 1.75 wide and d44 10" drums are 2.5 wide
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