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3.9 ratio for AU3 XR8 

 

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 Post subject: 3.9 ratio for AU3 XR8
Posted: Thu Jun 14, 2007 12:34 pm 
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I was just wonedering if the 3.9 diff gears will fit into the original AU3 XR8 diff? and how is this done?

 

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Posted: Thu Jun 14, 2007 1:18 pm 
Oompa Loompa
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more information, where 3.9 gears from etcetc

also if ou got auto be prepared for 3k rpm as you driving down the highway at 100
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Posted: Thu Jun 14, 2007 1:34 pm 
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Ride: AU3 XR8

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Location: Sydney
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just saw it on ebay and was curious. its a Borgwaner 3.9 diff gears.
and my car is a manual.

 

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Posted: Fri Jun 15, 2007 8:02 am 
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what is the ratio of the standard diff and will a 3.9 be too much if i drive daily as well?

 

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Posted: Fri Jun 15, 2007 8:07 am 
Getting Side Ways
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3.45 is standard, 3.9 will be fine, it will just rev a little @ 110. Your top gear is .73 roughly (manual. .68 auto) and in my XA I have 3.7 rears, and sit on about 2800 @ 100 with a 1.1 top gear....
Diff gears make a huge difference
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Posted: Fri Jun 15, 2007 8:26 am 
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I've got 3.9's in my ef xr8 auto, sits on 2400rpm at 100kmh. The only time i really notice the rev's is from 90kmh up.
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Posted: Fri Jun 15, 2007 1:51 pm 
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Location: Sydney
NSW, Australia

do the 3.9 gears fit into the standard diff?
is it something i could do myself or is it best to get a qualified person to do it?

 

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Posted: Fri Jun 15, 2007 2:12 pm 
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Gears should fit fine. I'd take to a diff shop to be done. I paid $1100 for 3.9's fitted plus lsd rebuilt.
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Posted: Fri Jun 15, 2007 4:27 pm 
Oompa Loompa
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I just rang up two different diff places and was told that you can't fit skyline/pintara gears into an ea or later Falcon as the pinion heights are different. I don't know if this is true but be carefull mate. Can anyone else clear this up, has anyone done it?
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Posted: Fri Jun 15, 2007 6:52 pm 
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Sprjenkins wrote:
I just rang up two different diff places and was told that you can't fit skyline/pintara gears into an ea or later Falcon as the pinion heights are different. I don't know if this is true but be carefull mate. Can anyone else clear this up, has anyone done it?


the ones which I am looking at specifically say falcon or mustang diff gears. Maybe the sylines only fit into the commodores cos the vl's have a similar tye of set up dont they?

 

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Posted: Sat Jun 16, 2007 1:15 pm 
Oompa Loompa
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Yeah I found out that you can fit them after all. If someone tells you can't tell them they don't know what there on about. Victoria diffs in mitcham do it and Northern Differentials in Campbellfield do it as well. It involves putting bw 75 series gears into the bw 78 series of your falcon. It can be done if you know what your doing.
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Posted: Sat Jun 16, 2007 1:15 pm 
Oompa Loompa
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Location: Melbourne
VIC, Australia

Yeah I found out that you can fit them after all. If someone tells you can't tell them they don't know what they're on about. Victoria diffs in mitcham do it and Northern Differentials in Campbellfield do it as well. It involves putting bw 75 series gears into the bw 78 series of your falcon. It can be done if you know what your doing.
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