Upgrade 9" drums to 10"?????

G

gcam

NAXJA Forum User

Location

alberta, canada

• Jan 11, 2005

• #1

I just saw on a thread started by Nick that some Chrysler 8.25" rears had 10" drums. What would it take to upgrade my 9" drums to 10" drums?

Thanks.

Geoff

 

C

ChiXJeff

Curmudgeon

NAXJA Member

Location

SE MN

• Jan 11, 2005

• #2

Pretty much everything from backing plate to drum. I'm not even sure if the wheel cylinders are common.

 

C

CartsXJ

NAXJA Forum User

Location

Glenville, NY

• Jan 11, 2005

• #3

Which 8.25 came with 10" drums? Wouldn't just be easier to get the rear disk brakes from a ZJ? They are almost a complete bolt-on, I believe. You just need to open the hole of the backing plate.

 

G

gcam

NAXJA Forum User

Location

alberta, canada

• Jan 11, 2005

• #4

But I thought the rear disc swap from a ZJ was only done on a D35, not a 8.25. ZJ's had discs and D35's, so thought that was why that swap could be done. If I can swap ZJ discs to a 8.25.... Well, that sounds pretty freakin' good to me.

Geoff

 

S

Sparkman

NAXJA Forum User

Location

Ludlowville, NY

• Jan 11, 2005

• #5

ZJ discs can go on an XJ with an 8.25" with only slight modification.

 

Eagle

Lifetime NAXJA Member

NAXJA Member

Location

Terra Firma

• Jan 11, 2005

• #6

Sparkman said:

ZJ discs can go on an XJ with an 8.25" with only slight modification.

Click to expand...

Plus I am not aware that any XJs came with 10" drums on the 8.25 axle. Cgrysler changed from 10" to 9" rear brakes in 90 or 91, which was before they were using the 8.25 axle in the XJ

 

Matthew Currie

NAXJA Member #760

Location

Vermont, land of big clay

• Jan 12, 2005

• #7

Eagle said:

Plus I am not aware that any XJs came with 10" drums on the 8.25 axle. Cgrysler changed from 10" to 9" rear brakes in 90 or 91, which was before they were using the 8.25 axle in the XJ

Click to expand...

Parts places always list the two options, even for later ones. I wonder if that's just an oversight, or is there some mystery 10 inch version we're unaware of?

 

johnnyc

NAXJA Forum User

NAXJA Member

Location

La Habra, CA

• Jan 12, 2005

• #8

Sparkman said:

ZJ discs can go on an XJ with an 8.25" with only slight modification.

Click to expand...

Which ZJ discs? I'm asking because I can get the discs off a ZJ aluminum Dana 44 for cheap. Would these work on a 8.25?

 

P

Pietro

NAXJA Forum User

Location

none of your business

• Jan 12, 2005

• #9

i always say i got a 10 incher

 

MJR

NAXJA Forum User

Location

Costa Mesa, CA

• Jan 12, 2005

• #10

I would just go with disc brakes. The KJ 8.25 discs should be a direct swap if you found some. The 9" drum brakes started in 90 like Eagle said. The older ones aren't any better. The 10" have narrower shoes vs the 9".

 

Last edited: Jan 12, 2005

DanMan2k06

NAXJA Forum User

Location

Damascus, MD

• Aug 25, 2007

• #11

Our family has a 98 XJ that was a government park ranger vehicle. It had a police package. I am not sure exactly what that includes. We have the 10" x 1.75" rear drum brakes. We also have two 1997 XJ's they both have 9" x 2.5" rears. The best I can determine is that the 10" is for heavy duty applications.