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9 inch or 8/3/4 lsd for au falcon

2K views 14 replies 6 participants last post by  jonbays 
#1 ·
Hi ...hope you are well today...Firstly Iwould like to find out where can I get a conversion of my au wagons' diff to maybe 9 inch or 8 inch lsd here in sydney.I also have been advised by some forum members that 3.5 ratio and up would be the go. Please bear in mind that I do quite alot of driving at 110 kph(freeway driving).I had a 3.5 ratio on my old xc falcon and it slowed down from this and revved too much...is the ford 4 speed auto easier revving with this ?
 
#4 ·
The AU wagon has a 3.23 BTR diff in it and you can get 3.45 or 3.73 gears fitted drive in drive out for $900 or $1500 with an lsd centre.

In Sydney try Craft Differentials
5 Peel St Granville 2142 (02) 9637 1973
 
#5 ·
jonbays said:
The AU wagon has a 3.23 BTR diff in it and you can get 3.45 or 3.73 gears fitted drive in drive out for $900 or $1500 with an lsd centre.

In Sydney try Craft Differentials
5 Peel St Granville 2142 (02) 9637 1973
$600 extra for an lsd centre what a rip off!!!!!

I rang around a while ago and for full rebuild incl bearings, lsd, new everything on exchange basis was $780 drive in drive out. that was for any ratio. that price was from a place in greenacre from memory.


just fyi, you can get 345 led from pick a part in narellan i think for about $400. disc to disc with around 100k
 
#6 ·
id like to know how they can do a NEW diff for 780, on an exchange basis, seing that an LSD Hemisphere is $650, gear sets are $550, and bearings are $200 odd. None of that includes labor.
 
#9 ·
Walkinshaw said:
id like to know how they can do a NEW diff for 780, on an exchange basis, seing that an LSD Hemisphere is $650, gear sets are $550, and bearings are $200 odd. None of that includes labor.
only telling you what they told me mate...highest quote I got was $1000.

I did fail to mention that price is with you removing the diff from your car and reinstalling it.
 
#11 ·
I got quoted today for a ratio swap to 3.45 at $750 big difference!! $350 to be exact. I think my exisitng ratio is 3.23 ..cant find id tag dammit..To got to a 3.45 the increase is...3.45/3.23 =1.068111= 10.68 %So it will rev harder by this amount and therefore get me into under 7 second bracket..
 
#15 ·
Walkinshaw goes to the top of the class for maths guys.

3.45 is 7% lower geared and 3.73 is 15%.

Like this 3.45/3.23=1.068 lets say 1.07 or 7% more turns for the same speed.
 
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