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#1 | ||
Tickford XR8
![]() Join Date: May 2008
Posts: 700
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Hi Guys,
i am wanting to change the diff gears in my au xr8 220 auto ute. i use it only on some weekends and do hwy and around town driving. iam not worried about fuel economy, iam just after performance. chriss at BPR has recomended 4.11's, can anyone tell me what there like? i was thinking of 3.9's but maybe 4.11's are the go. thanks any advice on this would be a great help. |
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#2 | ||
rexnet
Join Date: Feb 2010
Location: Adelaide, South Australia
Posts: 3,562
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I know a guy that had 4.11's in an ef fairmont auto. He struggled for traction in 1st. I think you have alot of fun
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#3 | ||
Stroking it...
Join Date: May 2005
Location: The 'butt
Posts: 2,844
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I have 3.9's in my Stroked AU Fairmont, and I love them! In my car its makes traction a big issue in 1st... I also find it works really well for dropping back to 3rd for overtaking..
Cant see a reason to go any shorter with a V8, IMO anyway.. |
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#4 | ||
Tickford XR8
![]() Join Date: May 2008
Posts: 700
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Thanks for the info,
dose anyone know how many revs it would be doing at 100km with 4.11 gears in it, also what would i have to do to get the speedo reading right. Thanks Pete |
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#5 | ||
Stroking it...
Join Date: May 2005
Location: The 'butt
Posts: 2,844
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As a guide, mine does 2300rpm at 100 with the 3.9's..
For the speedo: http://www.jaycar.com.au/productView.asp?ID=KC5435 |
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#6 | ||
AUII XR8, BA XR8 290 UTE
Join Date: Oct 2008
Location: WA
Posts: 528
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Hey mate, i got 4.11s fitted to my sedan (auto also..) i love it!
can be a bit of a pain in the wet at times, with no word of a lie ive taken off at nanna pace and still broke traction haha Only revs at around 2400rpm, at what i think is around 100, i still havnt got my speedo sorted yet either... And to be brutally honest, i havnt noticed a massive increase in fuel either. Performance wise the take off is just awesome, although giving it a bit when sitting on 80+ isnt what it used to be but is still more than enough. Also knocked off 0.7 of a second off my quarter mile time!
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AUII XR8 220 Build : Blown 380HP 810NM - http://www.fordforums.com.au/showthread.php?t=11253752 BA 290 XR8 Ute Build -http://www.fordforums.com.au/showthread.php?t=11271242 |
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#7 | ||
Tickford XR8
![]() Join Date: May 2008
Posts: 700
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Thanks again for the advice,
iam still not sure weather i will go for 4.11's or 3.9's, but i am looking forward to the change either way. |
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#8 | ||
AUII XR8, BA XR8 290 UTE
Join Date: Oct 2008
Location: WA
Posts: 528
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Im sure the breaking of traction under light acceration would easily be fixed with a decent set of tyres.
You might want to take into consideration what sort of events etc, you might wanna do with your car also. Obviously 4.11s arnt well suited for full track racing... However drags, drift, burn-outs, she'll love it! ![]()
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AUII XR8 220 Build : Blown 380HP 810NM - http://www.fordforums.com.au/showthread.php?t=11253752 BA 290 XR8 Ute Build -http://www.fordforums.com.au/showthread.php?t=11271242 |
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#9 | ||
Tickford XR8
![]() Join Date: May 2008
Posts: 700
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Hi MGGT RAA,
Breaking of traction under light acceration, is what iam after. i wont be doing track racing. just around town and hwy driving some times, i want it to have lots of go down low but also be good on the hwy at 100km for passing Thanks Pete |
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#10 | ||
Regular Member
Join Date: Feb 2011
Location: Melbourne - Eastern suburbs
Posts: 118
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The difference between 3.9 and 4.11 is hardly worth worrying about, either will do you well.
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#11 | |||
FF.Com.Au Hardcore
Join Date: Dec 2009
Posts: 905
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Quote:
Then buy the cheapest crappiest skinniest tyres , and drive round sideways everywhere . Makes me feel safe ... not ! LOL My old man had 4.1's in his stroked EB windsor . Was awsome to drive , mind you it revved to 6800rpm which the 4.1's benefited . Otherwise 3.9's will do you fine ![]() One of the best bang for buck mods on those cars .
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1998 AU VCT Ghia - Stock as a rock - Wifes car 1991 Toyota Soarer TT - 11.72 @ 116.7mph 2004 Ford Escape XLT V6 - Family Ride . |
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#12 | ||
Regular Member
Join Date: Mar 2011
Posts: 377
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I have 3.9 in an auto v8 and my car does 2100rpm at 100kph,improved my economy and made my car feel quite spritely and sometimes it will go a bit sideways when it hits second with newish 225 tyres and a fresh lsd,never did that with 3.23 gears
![]() I cant say it loses traction while you are actually moving though, i hoped it would ![]() |
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#13 | ||
Critical Thinker
Join Date: Jan 2005
Location: Adelaide
Posts: 20,335
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Interesting thread. Its certainly giving me ideas.
Anyone know what a set of 3.9s would set one back, and where you would get your hands on a set of gears?
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"the greatest trick the devil pulled, is convincing the world he doesn't exist" 2022 Mazda CX5 GTSP Turbo 2018 Hyundai Santa Fe Highlander 1967 XR FALCON 500 Cars previously owned: 2021 Subaru Outback Sport 2018 Subaru XV-S 2012 Subaru Forester X 2007 Subaru Liberty GT 2001 AU2 75th Anniversary Futura 2001 Subaru GX wagon 1991 EB XR8 1977 XC Fairmont 1990 EA S Pak 1984 XE S Pak 1982 ZJ Fairlane 1983 XE Fairmont 1989 EA Falcon 1984 Datsun Bluebird Wagon 1975 Honda Civic |
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#14 | ||
Regular Member
Join Date: Feb 2011
Location: Melbourne - Eastern suburbs
Posts: 118
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If I can give you a hint, they say the 3.9s are pretty noisy, and were re-designed as 3.89s for later model cars. (I had a list of crownwheel to pinion teeth count, but I can't find it at the moment.)
They were in Australian R31 Nissan Skylines, are pretty easy to find used, and I believe are still available new. 4.11s were in Australian R31 Nissan Pintaras. |
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#15 | ||
Tickford XR8
![]() Join Date: May 2008
Posts: 700
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Hi Guys,
Thanks for all the feedback, iam going to go with the 3.9's. will let you know how it goes. as for cost i had 2 quotes 1st $1200 2nd $1500-$2000, both are for compleat job. I dont know how much just for gears. |
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#16 | ||
Regular Member
Join Date: Feb 2011
Location: Melbourne - Eastern suburbs
Posts: 118
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Ooops, just found my notes. Seems the 3.89s were noisy and the 3.91s are the replacement / upgrade.
Ross |
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#17 | ||
FF.Com.Au Hardcore
Join Date: Jul 2005
Location: Lyndhurst
Posts: 563
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I'm wanting to do 3.9"s in my au xr8 ute auto, but heard some people say it hits limiter a few times before changing gears at wot even with the speedo corrector, second hand gears are about 200 and approx 500 labour with bearings etc
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#18 | ||
Regular Member
Join Date: Jul 2011
Posts: 78
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heyy, put the gears in yet?? i wanna do mine still, dont know if 3.9 or 4.11
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#19 | ||
Smile
Join Date: Dec 2004
Location: Merrylands Sydney
Posts: 8,541
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3.9 are the best compromise for the v8.
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Stingray Car Security ph 0414445444 Single din radio fascias for fg to fgx fords Australia wide . FG 1 2 and 3 gauge holder in stock now! https://stingraycar.com.au/shop/ Site Sponsor See Sponsor Stingray Car Security 😍👌✌ AU wagon 6 14.241@96.75 1/4 mile sold.Octane fg xr6 turbo!! 12.312 112.21 mph home tune f6 injectors gone ..now in nitro fgxr6t ready to go again ![]() |
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#20 | ||
Stroking it...
Join Date: May 2005
Location: The 'butt
Posts: 2,844
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Agreed that 3.9's are great for a V8, yet even with my NA stroker I have considered going for longer gears.... No need for the 3.9's to get off the line.. Especially if your name and sig is anything to go by Blown347AU.... I would be looking at 3.23's/3.08 and a C4....
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#21 | ||
Regular Member
Join Date: Jan 2005
Location: Canberra
Posts: 364
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I've got the 3.9's in my manual ute, and I wish I spent the money elsewhere. Having said that it does make it a little easier to drive around town, but don't expect a total transformation in performance.
Diff Doctor in the ACT did mine for $1500 which included brand new gears, bearings and LSD cones. The gears he used were new out of the box and weren't recycled Nissan items.
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FPV GS Ute #370/Brembo brakes |
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