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Old 17-03-2008, 09:12 AM   #1
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Default AU 3.7 gear prices?

Whats the going rates on 3.7 gears for AU's? Where abouts can i get them from?

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Old 17-03-2008, 11:41 AM   #2
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Quote:
Originally Posted by BLUEPRINT
Whats the going rates on 3.7 gears for AU's? Where abouts can i get them from?
Any diff joint will have them.

The lowest I've been quoted is $220 for good second hand units, but I paid $559 for non genuine new gears. The Borg Warner stuff is another $100-150 on top of that, but if you ring around, you might be surprised what you find.

GK
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Old 17-03-2008, 12:08 PM   #3
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Originally Posted by GK
Any diff joint will have them.

The lowest I've been quoted is $220 for good second hand units, but I paid $559 for non genuine new gears. The Borg Warner stuff is another $100-150 on top of that, but if you ring around, you might be surprised what you find.

GK
What do you mean by the Borh Warner stuff?
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Old 17-03-2008, 12:10 PM   #4
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What do you mean by the Borh Warner stuff?
He's a cousin of Borg! He lives right next door in the locality of Keyboard! LOL!

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Old 17-03-2008, 08:31 PM   #5
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IIRC Borh Warner was the Swedish chef on the Muppet Show... bork bork bork!
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Old 17-03-2008, 08:59 PM   #6
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Sly I believe we are revealing two things to the AUvian world.

1. Our age - The Muppets were good, but not a patch on Sesame Street!
2. Our inability for comedy!

LOL!

GK
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Old 17-03-2008, 09:57 PM   #7
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Hey mate,

Check out these guys, pretty cheap and in NSW.

http://www.difftechnics.com.au/

They have any gears for $495 at the moment.

You have to make sure you get the right gears though, as I believe you have a standard Falcon, which means a 3.08 housing. Thus, you can't slot in a 3.45 or 3.73 BW gears, as they won't fit. You need to look for Skyline or Commodore gears I believe.

Check up on it, goodluck!
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Old 17-03-2008, 09:59 PM   #8
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Quote:
Originally Posted by GK
Sly I believe we are revealing two things to the AUvian world.

1. Our age - The Muppets were good, but not a patch on Sesame Street!
2. Our inability for comedy!

LOL!

GK
we are in fine form tonight PMSL
borg warner is the original manufacture of the diffs StealthAu
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Old 17-03-2008, 10:28 PM   #9
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Quote:
Originally Posted by LG
Hey mate,

Check out these guys, pretty cheap and in NSW.

http://www.difftechnics.com.au/

They have any gears for $495 at the moment.

You have to make sure you get the right gears though, as I believe you have a standard Falcon, which means a 3.08 housing. Thus, you can't slot in a 3.45 or 3.73 BW gears, as they won't fit. You need to look for Skyline or Commodore gears I believe.

Check up on it, goodluck!
LG is right. But the measurements for the housing are 7 and a half inch or 7 and 3/4 inch. IIRC, the BW gears will fit 7 and 3/4 and 7 and 1/2 housings with some modification. A place that only does diffs will be able to tell you about it though.

I put aftermarket gears in my diff for this reason. The BW were $150 dearer including the mod needed to get them into my housing.

The 3.08 LG was talking about was the stock diff ratio for the Forte, Futura and SR autos.

I may have missed something in there, but I think that's pretty much all correct.

GK
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Old 17-03-2008, 10:48 PM   #10
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Originally Posted by au3xr6
we are in fine form tonight PMSL
borg warner is the original manufacture of the diffs StealthAu
I realise Borg Warner is the diffs used in the AU, along with almost every other car built in a long time, I just didn't take in what GK said at first, just a tad slow today
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Old 17-03-2008, 10:57 PM   #11
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Quote:
Originally Posted by LG
Hey mate,

Check out these guys, pretty cheap and in NSW.

http://www.difftechnics.com.au/

They have any gears for $495 at the moment.

You have to make sure you get the right gears though, as I believe you have a standard Falcon, which means a 3.08 housing. Thus, you can't slot in a 3.45 or 3.73 BW gears, as they won't fit. You need to look for Skyline or Commodore gears I believe.

Check up on it, goodluck!
Not quite, BW make all gears to suit the full range of Falcons but there are specific diff changes through the years that need to be carefully looked at. Skyline gears are rubbish, diff guys were slotting those things in because they could get cheap used items very easily. For my money, I went BW 3.73s and they are an awesome bang for buck mod. Talk to the guys at Bosnjak engineering in Sydney (02) 9757 2133 - they'll even quote u part numbers as a courtesy out of town.
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Old 18-03-2008, 03:10 AM   #12
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3.08 was also the ratio for the fairmont S1, but I think Ghia had a different ratio.
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Old 18-03-2008, 08:01 AM   #13
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So much to think about... what about the XR6 ratio?
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Old 18-03-2008, 10:36 AM   #14
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XR's had 3.45's fitted.
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Old 18-03-2008, 11:13 AM   #15
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So am I able to fit XR diff gears into my (what i presume) Forte' diff? I just need to know what options i have to play with and rough costs.
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Old 18-03-2008, 11:23 AM   #16
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XR gears should be a direct fit you might be better off doing what i did for $600 I picked up an XR diff complete that had done on 38 000Ks
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Old 18-03-2008, 11:24 AM   #17
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sorry to hijack but wat would an ex-cop car have seen as though they kindly put LSD into them for us same as an XR?
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Old 18-03-2008, 11:33 AM   #18
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Originally Posted by au3xr6
XR gears should be a direct fit you might be better off doing what i did for $600 I picked up an XR diff complete that had done on 38 000Ks
Are they IRS? is it a big job changing from live to IRS?

oh, and 3x-puursui7, no problems with the hi-jack IMO, we are all here to learn :P
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Old 18-03-2008, 11:41 AM   #19
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so whats supposed to be standard gearing for a series 2 fairmont ghia???lol. IRS also.
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Old 18-03-2008, 11:47 AM   #20
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Quote:
Originally Posted by BLUEPRINT
Are they IRS? is it a big job changing from live to IRS?

oh, and 3x-puursui7, no problems with the hi-jack IMO, we are all here to learn :P
no fitted an XR 3.45 LSD live axle these were fitted with the HP (non VCT) engine
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Old 18-03-2008, 11:49 AM   #21
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so whats supposed to be standard gearing for a series 2 fairmont ghia???lol. IRS also.
It was a 3:23 or 3:45 wasn't it, to give it some more punch with the extra weight of all the goodies!

Can someone confirm, I checked my manual, but there's no mention of it. Maybe the workshop manual will help. I'll look tonight if I remember.

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Old 18-03-2008, 11:51 AM   #22
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Originally Posted by GK
It was a 3:23 or 3:45 wasn't it, to give it some more punch with the extra weight of all the goodies!

Can someone confirm, I checked my manual, but there's no mention of it. Maybe the workshop manual will help. I'll look tonight if I remember.

GK
ah ok, i was told that it was 3.45 but just wanted to make sure, will be gettin 3.9's but will sell the ones out of the car...
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Old 18-03-2008, 11:51 AM   #23
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Ive been watching this thread closely.

So what your saying is get a complete diff from an XR6 HP 3:45 ratio non-IRS and it should be a complete swap over?
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Old 18-03-2008, 12:00 PM   #24
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Quote:
Originally Posted by blueoval
Ive been watching this thread closely.

So what your saying is get a complete diff from an XR6 HP 3:45 ratio non-IRS and it should be a complete swap over?
yes it bolts straight in just make sure you change the speedo gear. the fairmont ghia had a 3.23, only the XR had 3.45
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Old 18-03-2008, 12:05 PM   #25
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Quote:
Originally Posted by au3xr6
yes it bolts straight in just make sure you change the speedo gear. the fairmont ghia had a 3.23, only the XR had 3.45
But is the IRS an easy enough swap over?
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Old 18-03-2008, 12:16 PM   #26
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Quote:
Originally Posted by au3xr6
yes it bolts straight in just make sure you change the speedo gear. the fairmont ghia had a 3.23, only the XR had 3.45
aaah I see. Thanks for the tip. I'll have to go keep an eye out for diffs to suit now.
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Old 18-03-2008, 01:02 PM   #27
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FTG (site sponsor ) will probably have one
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Everyone starts off with a bag full of luck and an empty bag of experience. The trick is to fill the experience bag before the luck bag is empty.

"It is better to remain silent and be thought a fool than to speak out and remove all doubt."

Start a new career as a bus driver

Rides:
FG2 XR6 stock at this stage but a very nice ride

xc 4 DOOR X CHASER 5.8 UNDER RESTO
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Old 18-03-2008, 01:15 PM   #28
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Quote:
Originally Posted by BLUEPRINT
But is the IRS an easy enough swap over?
Depends on what you call easy, it is a matter of replacing the entire diff and all suspension components (tailshaft too?)
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Old 18-03-2008, 01:20 PM   #29
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Depends on what you call easy, it is a matter of replacing the entire diff and all suspension components (tailshaft too?)
Easy is things that are simply bolted... harder is when i'd have to cut and shut steel frame work... (although not that hard, as i've done it all before : )
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Old 18-03-2008, 01:21 PM   #30
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it bolts straight in just a heavy fiddly job
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"It is better to remain silent and be thought a fool than to speak out and remove all doubt."

Start a new career as a bus driver

Rides:
FG2 XR6 stock at this stage but a very nice ride

xc 4 DOOR X CHASER 5.8 UNDER RESTO
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