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3.9 LSD 

 

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 Post subject: 3.9 LSD
Posted: Wed Apr 09, 2008 9:35 am 
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Just thought i'd post up real quick to see what its worth and who to talk to about puttin 3.9 gears in the AU. havnt found anyone close to me that knows much about it all, cheers. Just need a price really and someone around frankston or dandy area that knows there s**t.lol

 

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THE Fairmont Ghia : 75th Anniversary LE
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Posted: Wed Apr 09, 2008 10:31 am 
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3.9's or 4.11s have about $1000 for a shop to fit and supply the gears. maybe 1200 if you supply the gears that could take ALOT off they often charge alot for the gears eg $400-500 ebay will get ya some for 100-200 and you'd be unlucky to get some in s**t condition...

 

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ED Fairmont Barra 190rwkw 4.10 Gears 3500 Stall 1/4 to come

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Posted: Wed Apr 09, 2008 10:36 am 
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Well new gears are around 450... and a new LSD hemisphere is 500

so it all depends how cheap you can pickup a second hand set.

I got quoted recently 800-1000 just to upgrade my 3.7 diff to LSD :roll: Cause you need new bearings, plus labour and parts it all adds up
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Posted: Thu Apr 10, 2008 8:39 am 
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the car is already 3:45 LSD just need to find some 3.9 gears and put em in.

 

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THE Fairmont Ghia : 75th Anniversary LE
Current Mods - 2.5" Exhaust, Custom CAI, Built Gearbox( Mirror Polished Casing+Bellhousing,TCE 2500 custom convertor, Modified Valve Body), Detailed UnderCarriage, SQ Stereo Install = 136+rwkw
http://www.aufalcon.com.au/sikford

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Posted: Thu Apr 10, 2008 8:58 am 
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might as well fit new gear set, and new bearings..... after labour im guessing will cost around 1000
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Posted: Thu Apr 10, 2008 9:02 am 
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Ride: AUII Ghia 75th LE, KF 1.8S 5spd

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yeah, sweet. might ask around to see who ppl have used down this way, hopefully i can get them in soon

 

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THE Fairmont Ghia : 75th Anniversary LE
Current Mods - 2.5" Exhaust, Custom CAI, Built Gearbox( Mirror Polished Casing+Bellhousing,TCE 2500 custom convertor, Modified Valve Body), Detailed UnderCarriage, SQ Stereo Install = 136+rwkw
http://www.aufalcon.com.au/sikford

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Posted: Sat Apr 12, 2008 6:44 pm 
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try some smaller places. the ones where the guy who owns it is the guy who works there. they don't have the overheads that a lot of bigger places do. the downside is they sometimes don't have the same buying power but its worth a try.

i converted my 3.9minispool diff to l.s.d. for $550. used some old bloke who worked by himself. most other larger diff/trans type places wanted around $1000.

 

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eb v8: low loud and fast. just how a v8 should be. i guess the big question is, is it fast enough...

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Posted: Mon Apr 14, 2008 8:33 am 
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oh nice, i'll check around

 

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THE Fairmont Ghia : 75th Anniversary LE
Current Mods - 2.5" Exhaust, Custom CAI, Built Gearbox( Mirror Polished Casing+Bellhousing,TCE 2500 custom convertor, Modified Valve Body), Detailed UnderCarriage, SQ Stereo Install = 136+rwkw
http://www.aufalcon.com.au/sikford

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Posted: Tue Apr 15, 2008 1:10 am 
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for an au with the planned mods of cam exhaust and tune would you reckon 3.7's or 3.9's would be the go?

coz the 3.7s would roughly sit on 2360rpm at 110, but i think if given the beans might still drop back to second when doing o/taking at 100ks...

the 3.9s would sit on 2460rpm.

whaddaya guys think? 3.7's or 3.9's????

 

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Posted: Tue Apr 15, 2008 8:56 am 
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More Grunt wrote:
for an au with the planned mods of cam exhaust and tune would you reckon 3.7's or 3.9's would be the go?

coz the 3.7s would roughly sit on 2360rpm at 110, but i think if given the beans might still drop back to second when doing o/taking at 100ks...

the 3.9s would sit on 2460rpm.

whaddaya guys think? 3.7's or 3.9's????


im tryna work out the same thing, not sure if ill get 3.9's or 3.7's now, its s**t me.lol

 

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THE Fairmont Ghia : 75th Anniversary LE
Current Mods - 2.5" Exhaust, Custom CAI, Built Gearbox( Mirror Polished Casing+Bellhousing,TCE 2500 custom convertor, Modified Valve Body), Detailed UnderCarriage, SQ Stereo Install = 136+rwkw
http://www.aufalcon.com.au/sikford

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Posted: Tue Apr 15, 2008 9:03 am 
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if you got an auto, then theres no question...... 4.11's

that will have a similar first gear to an xr6 manual with 3.45 diff apparently
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Posted: Tue Apr 15, 2008 9:06 am 
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get 3.9s. Its fine on the freeway.

 

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Posted: Tue Apr 15, 2008 10:12 am 
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Ive got 3.9s in my KAAZ behind my auto turbo six..... Great investment, cruises nicely along the highway.....

 

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Posted: Tue Apr 15, 2008 11:03 am 
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FordFairmont wrote:
if you got an auto, then theres no question...... 4.11's

that will have a similar first gear to an xr6 manual with 3.45 diff apparently


yeah but your looking at 2600 rpm at 110 km/h, and thats just over my limit of 2500. I wont go any higher than that, so 3.9's are as far as id take it. xr6 mans 1st gear is too short anywhoo... blink and you would miss it.

 

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Posted: Tue Apr 15, 2008 11:06 am 
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More Grunt wrote:
FordFairmont wrote:
if you got an auto, then theres no question...... 4.11's

that will have a similar first gear to an xr6 manual with 3.45 diff apparently


yeah but your looking at 2600 rpm at 110 km/h, and thats just over my limit of 2500.


yeah that sounds right.

but 2600 is nothing, f**k when i do 120kph im sitting on 3000rpm, fuel economy is hardly affected, maybe half a litre per 100km's more fuel.... the car doesnt overheat....

And brings a smile to my face everytime i plant the foot so its well worth it in my opinion
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