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9 inch diff brakes


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#1 HDT166

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Posted 13 March 2019 - 12:01 PM

Hello gurus,

i know this has probably been asked a bunch of times but i cant find anything on the site. 

How hard is it to swap 9 inch diff with drums to commodore disc brakes.

Does anything have to be welded or do the axles need to be changed? any info would be great. 

Thanks 



#2 mick_in_oz

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Posted 13 March 2019 - 09:52 PM

Need to know what bearing and brake is currently on it???

If its got Holden stuff all round, then it is a simple change the bearing kit from a drum to a disc, only difference is the seal for the disc bearing kit is thicker/deeper to account for the backing plate difference between drum and disc. Also need a hub ring to locate the disc on the axle properly.

 

Then the next hurdle is connecting the park brake cables, there are places that offer new cables to suit for the conversion, but some on here have had trouble with then not being right.



#3 VZ1_60

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Posted 14 March 2019 - 09:14 AM

the bearing ends will also be a factor in what fits.

Phil Purser in O'Connor is probably the best person to speak with, or maybe have a chat to these guys, they seem to have a good handle on 9" conversions - www.altra9.com.au.

Have a look on their website under the technical info tab, there is a PDF of the bearing end dimensions.

cheers, john



#4 HDT166

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Posted 14 March 2019 - 10:29 AM

thanks for the info guys . i will take some measurements. i didnt realise there was so many different types .

mine is drum brake rear



#5 bat 53

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Posted 14 March 2019 - 10:31 AM

done a few drum to disc conversions on a veriety of diffs 

some cases redrill the holes in the backing plate 

cable cut to length then silver solder the end on 

 

cheers  bat



#6 HDT166

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Posted 14 March 2019 - 10:35 AM

ive done a commodore handbrake on a lx hatch before , moving the calipers to the front and got it all working very good. wasnt too hard. but i have never done a drum to disc conversion. 



#7 bat 53

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Posted 14 March 2019 - 10:53 AM

aaron give me a call i can run you through it 

0410548586



#8 HDT166

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Posted 18 March 2019 - 10:37 AM

thanks mate






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