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  #1  
Old October 3rd, 2019, 21:45
AIDANMELAD AIDANMELAD is offline
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Drum sizes

Hi guys, my 2001 XJ Limited,had some rotted brake lines. Replaced them, then found out the wheel cylinder's are shit. My Jeep is upstate, I'm in the City, How can I tell what size drums my Jeep has...TIA!
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  #2  
Old October 3rd, 2019, 21:52
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Re: Drum sizes

Every XJ I have worked on had 9" drums but Rock Auto shows a 10" drum, used in police cars.
Measure the outside diameter of the drum. If it is almost 11", it's a 9" drum. if it measures 12-1/2" in diameter, it's a 10" drum.
Specs taken from Rock Auto's site.
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01 Sport, Russ Pottenger 4.6, AW4, 4" lift, 33 X 10.50 KM2, 4.56-8.25 TruTrac, D-30-E-Locker with alloy shafts, Hidden M8000 winch, Vanco front and ZJ rear disc brakes, Frame stiffeners, Lots of armor, Towing baseplate. http://www.flickr.com/photos/lwade/c...7603770130683/
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  #3  
Old October 4th, 2019, 00:24
Ralph77 Ralph77 is offline
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Re: Drum sizes

Chances are it is a 9" drum.
Ways to tell.
9" drums are not finned. 10" are.
To further confirm.
The wheel cylinders.
With a 9" set up the wheel cylinders for each side are the same. The brake line goes straight in.
With a 10" set up the wheel cylinders are different for right and left. The brake line comes in at an angle to each.
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Old October 4th, 2019, 04:33
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Tim_MN Tim_MN is offline
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Re: Drum sizes

9" drums are smooth, 10" drums are finned.

.

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Quote:
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Go ahead and slam the liftgate down on a blanket, and see how long you are laughing.
Quote:
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Tim MAY be 100% correct, but why would a person automatically pick him as the expert .....

Last edited by Tim_MN; October 5th, 2019 at 11:42.
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Old October 4th, 2019, 07:37
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Re: Drum sizes

I think the Dana's had the 10" diameter drums and narrow/er shoes while the 8.25 have 9" drums and the wide shoes.

https://www.naxja.org/forum/showthread.php?t=1053079

I just went back in the archives. I remember this being discussed years ago.
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1996 XJ; 4.0L; AW4; NP231; SYE; D30 and D44; ECTED; 4.10 gears; 30X9.5 -15 BFG/AT/KO; 3" lift; Rusty's LCA; JKS ADJ UCA; Kevins ADJ Track bar; Drawtite Front Receiver; Dual Electric Fans; Dual Battaries.
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Old October 4th, 2019, 20:28
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Re: Drum sizes

9" drums have 2-1/2" wide shoes, 10" shoes are 1-3/4" wide.
Good to know that 10" drums have fins.
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Both XJs are still Real XJs http://www.naxja.org/forum/showthrea...hlight=real+XJ
01 Sport, Russ Pottenger 4.6, AW4, 4" lift, 33 X 10.50 KM2, 4.56-8.25 TruTrac, D-30-E-Locker with alloy shafts, Hidden M8000 winch, Vanco front and ZJ rear disc brakes, Frame stiffeners, Lots of armor, Towing baseplate. http://www.flickr.com/photos/lwade/c...7603770130683/
1997 Country, Mostly stock, 2" lift, Engine mods, NP242, Towing baseplate
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  #7  
Old October 5th, 2019, 10:05
Joeygo Joeygo is offline
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Re: Drum sizes

This is what I have sitting in the garage. D44 10" finned drum 2 1/2" shoes.
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  #8  
Old October 5th, 2019, 10:19
RCP Phx RCP Phx is online now
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Re: Drum sizes

I had the "big" (10 x 2-1/2") brake package on my D44.
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  #9  
Old October 6th, 2019, 08:14
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Re: Drum sizes

Quote:
Originally Posted by techno1154 View Post
I think the Dana's had the 10" diameter drums and narrow/er shoes while the 8.25 have 9" drums and the wide shoes.

https://www.naxja.org/forum/showthread.php?t=1053079

I just went back in the archives. I remember this being discussed years ago.
1. If my 2000 XJ limited has the 9" drums, can they be replaced by the 10" drums?
2. Is it worth the swap? Has anyone done it? Would you do it again?

I just picked up an 8.25 off craigslist for $100 and I need to go through the drums. Wondering if an upgrade is worth doing. I've read mixed reviews about rear discs. Sorry, I didn't mean to hijack the thread. Just providing background as to why I am asking about the drum swap.

TYIA
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  #10  
Old October 6th, 2019, 08:25
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Re: Drum sizes

answer is to measure the inside diameter of the existing drum, or if you don't have those to measure the diameter of the backing plate

almost all XJs had 9" so it is the safe default assumption. you will know right away if its not right
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  #11  
Old October 6th, 2019, 13:01
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Re: Drum sizes

Quote:
Originally Posted by jbeintherockies View Post
.... 9" drums, can they be replaced by the 10" drums?
Most likely, yes.

IMO, if you are going to change anything, go with disk brakes. KJ Liberty disk brakes are about as close to bolt on as you can get.
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Quote:
Originally Posted by bimmerjeeper

Go ahead and slam the liftgate down on a blanket, and see how long you are laughing.
Quote:
Originally Posted by soyjer

Tim MAY be 100% correct, but why would a person automatically pick him as the expert .....
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  #12  
Old October 6th, 2019, 13:07
RCP Phx RCP Phx is online now
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Re: Drum sizes

Quote:
Originally Posted by Tim_MN View Post
Most likely, yes.

IMO, if you are going to change anything, go with disk brakes. KJ Liberty disk brakes are about as close to bolt on as you can get.
Amen to that, if you change drums you have to change the backing plates and wheel cylinders also.
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  #13  
Old October 6th, 2019, 14:14
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Re: Drum sizes

Quote:
Originally Posted by Tim_MN View Post
Most likely, yes.

IMO, if you are going to change anything, go with disk brakes. KJ Liberty disk brakes are about as close to bolt on as you can get.
I am totally with these guys'. If you are ion through all that work, go with disks.

I do not know wat you heard but,... I did not set any breaking improvement going from a good working drum brakes to discs. However, other benefits include maintenance free over the years and better break pedal feel which adds to the comfort feeling when a panic break application is needed.
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1996 XJ; 4.0L; AW4; NP231; SYE; D30 and D44; ECTED; 4.10 gears; 30X9.5 -15 BFG/AT/KO; 3" lift; Rusty's LCA; JKS ADJ UCA; Kevins ADJ Track bar; Drawtite Front Receiver; Dual Electric Fans; Dual Battaries.
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