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08-06-2010, 10:41 AM | #1 | ||
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In searching for info about AU diff swaps, upgrades, ratio and centre (LSD) changes I think I've searched and read every possible relevant topic here at AFF but I still don't have all the info. I couldn't find any info about this in the technical stickys above in AU.Falcon.com either.
I thought I would start this in the AU section so that those who have done diff swaps can tell others exactly what works. Please don't reply here if your sister's boyfriend's mate's brother remembered hearing something about this from some bloke at the footy a few weeks ago and you're not sure if it's right, etc . I would hope that this becomes the definitive topic on what works and what doesn't! Hopefully a moderator can work with me on this topic to delete any incorrect info that is added and compile a good list of what is known to work. |
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08-06-2010, 10:42 AM | #2 | ||
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What I have learned so far.... (And please correct me if any of this is wrong)
28 spline axles were the only axles across all AU models. The spread of ratios are 3.08, 3.23, 3.45, 3.73, 3.89 and 4.11. I haven’t been able to determine exactly which ratios came out in which AU’s, with ute, wagon, sedan, XR’s all being different. Similarly I haven’t been able to determine which specific models LSD’s came in, and which are interchangeable. Some vehicles being leaf sprung, some live axle coil, and some IRS means that complete diff swaps between models are not always possible. Some AU live axle sedans have smaller diff housings/3rds that will only take 3.08 Ford gears. VL Commodore 6cyl R & P’s have a 3.45 ratio that will fit this AU diff. Slotting in a 3.45 LSD diff housing from and EL into an AU won’t work easily as the EL diff is 70mm shorter disc to disc than the AU. That’s about where I’m at at this point in time. If you have info you know is correct and has worked please post it up. |
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08-06-2010, 12:56 PM | #3 | |||
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Quote:
Does R&P stand for rack & pinion???
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08-06-2010, 01:37 PM | #4 | ||
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R & P = Ring (crownwheel) and pinion.
It was in a topic that I found here (AFF) when I was searching for info and the poster was adamant that the Commy VL 3.45 R&P bolted straight onto the 3.08 centre. Only thing not mentioned was compatibilty of pinion bearings etc. |
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08-06-2010, 02:25 PM | #5 | ||||
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From this thread from 5 years ago:
http://www.fordforums.com.au/showthread.php?t=8577 Quote:
Quote:
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10-03-2011, 10:51 AM | #6 | ||||
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Thread-mine time.....this has been bugging me for some time, so I asked the guys at Etheridge Ford about AU diffs...
Quote:
Quote:
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26-12-2020, 06:33 AM | #7 | |||
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Quote:
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08-06-2010, 11:01 AM | #8 | ||
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Forte/Futura
Manual 6 - 3.23 Auto 6 - 3.08 Wagon - 3.23 Auto V8 - 3.23 Fairmont Auto 6 - 3.23 (LSD Option) Auto VCT - 3.45 Auto V8 - 3.23 XR All XR's - 3.45 LSD |
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08-05-2011, 11:12 AM | #9 | |||
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Quote:
S1 forte is 3.08 S2/S3 forte is 3.23, No 3.08 in series 2 or 3 Correct ? AU 1 XR6 HP had an LSD but it was an option on S2 and S3.
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AU XLS. |
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08-06-2010, 11:04 AM | #10 | ||
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Fairlane/ltd
Vct6 - 3.45:1 Non Lsd V8 3.23:1 Lsd Opt
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08-06-2010, 04:40 PM | #11 | ||||
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Quote:
Quote:
Simple answer is all XR's had a 3.45 diff All XR8 and XR6VCT's had LSD for the life of the AU's XR6HP's had LSD as standard in Series 1 AU's. At some time in the Series 2 model life Ford cut costs and the HP's went from LSD standard to LSD optional.
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08-06-2010, 11:09 AM | #12 | ||
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Ute
XL 1t suspension Manual I6/V8 - 3.45 HD XL 1t suspension Auto I6/V8 - 3.23 HD XL 3/4t suspension Manual/Auto I6 - 3.23 XL 3/4t suspension Manual V8 - 3.45 HD XL 3/4t Auto V8 - 3.23 XLS sports suspension Manual I6/Auto I6/Auto V8 - 3.23 XLS Sports suspension Manual V8 - 3.45 XR sports suspension - 3.45 LSD |
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08-06-2010, 11:10 AM | #13 | ||
Just another mock-up..
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its amazing the variations between models and diffs hey..!!
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Desire isn't driven by the heart, the mind or the wallet. Desire comes from another place. It's created by the smell of burnt fuel under full throttle and the look a car gives you when you're washing it alone at night... see my car here: Built my own TL50!!! [SIGPIC][/SIGPIC]
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08-06-2010, 12:20 PM | #14 | ||
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Good info so far but I'm disappointed already! Looks like I have the smaller 3.08 ratio and housing in my Futura . I'm looking to go to a 3.45 LSD so I've got a bit of work to do.
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08-06-2010, 01:32 PM | #15 | ||
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Hey guys
Ive put a manual gear box and xr6 engine into a 1999 SI Fairmont. Should i look at putting the LSD diff in as well? What sort of gain would i get if i did?
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08-06-2010, 04:42 PM | #16 | ||
Just another mock-up..
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Location: In an AU Fairlane somewhere...
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where's the confusion Casper..? i didn't post about the XR's...?
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Desire isn't driven by the heart, the mind or the wallet. Desire comes from another place. It's created by the smell of burnt fuel under full throttle and the look a car gives you when you're washing it alone at night... see my car here: Built my own TL50!!! [SIGPIC][/SIGPIC]
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08-06-2010, 07:57 PM | #17 | ||||
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Minor error here re Ghia and LSD options as explored about month ago;
AU Ghia diff thread Quote:
Quote:
Cheers James |
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05-05-2011, 11:04 PM | #18 | ||
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Hey guys i have an au xr6 II ute with a manual transmission and the diff is bout ******.. I also have a ute of the exact same model.. Only thing it has an auto. Wondering if i can swap them over and if ratios are same ??
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05-05-2011, 11:19 PM | #19 | |||
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I know in BA taxis they use either an AU , E series or commodore center to make them stronger (4 pinion to replace 2 pinion hemi) they are apparently the same and interchangable, made in the same factory
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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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07-05-2011, 07:45 PM | #20 | ||
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its been a while ,but my old girl runs 3.89 gear's out of some nissan rear end.its all about your diff and what will fit fit.from memory au's run a 78 borg warner diff and most commo's and nissan gears bolt straight in .both off irs and live axle diffs.if you want 4.11 i think they need to machine something.i remember starting a thread like this years ago or someone else did .??????
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07-05-2011, 09:41 PM | #21 | ||
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Hi everyone just wondering what company does aftermarket LSD's for au falcon's ?? I had my Xr6 HP Au3 sold to me with the salesmen telling me it has an LSD which i later found out it doesn't (No lsd tag on diff) or at least it doesn't work. I though it's a little silly buying a whole diff when all i need is the centure anyone know who does them ? Hope it's still mostly on topic
Cheers Lorenz |
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07-05-2011, 09:47 PM | #22 | ||
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Yeah XR6 HP's dont come with LSD, only VCT models do. Im in the same boat, looking at getting a kaaz 2 way LSD
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08-05-2011, 01:37 PM | #23 | |||
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Quote:
HP's had it as an option, like the Baron has said.
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12-01-2012, 03:25 PM | #24 | ||
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OK thread mine time...
I've now gotten my hands on a 3.45 LSD from an S1 XR6 to upgrade from my 3.08 single spinner. Have also gotten a speedo cog to suit as well. From what I've been reading, the ECU uses speed, not RPM to determine gear shifts - so the easiest way to alleviate this is to transplant an XR6 ECU into my car. Alternatively, a J3 chip can do this for me using my stock ECU. However, if I get the diff put in WITHOUT changing the ECU straight away, will this cause me issues - obviously there will be higher RPM's before gears change, but in daily driving conditions, will this be a massive issue? I'm guessing at WOT this could be problematic...so the intent is to most likely go the J3 route, as that can be dyno tuned as well... Is there anything else I should be considering?
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12-01-2012, 05:08 PM | #25 | |||
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Drop Chris or Theo at Blupower a PM Dave, they should be able to help Northern Diffs next door is Chris's old man
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12-01-2012, 05:20 PM | #26 | ||
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Hey Dave,
I have fitted an XR6 diff and speedo cog to my car. I didn't need to change anything on my ecu when I got mine done. This was all before the s/c and any tuning. Drove it fine as it is. Still using the stock ecu as well. The Ecu is a learning computer as you know anyway, so it will get used to your driving style and cater for any changes. I normally drive around without the econ button on anyway. Seems to hold revs higher before changing anyway. Not sure if that helps or not.
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13-01-2012, 11:31 AM | #27 | ||||||
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13-01-2012, 02:50 PM | #28 | |||||
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Quote:
Yes I forgot you may need a B infront of the A Quote:
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........Age and treachery will ALWAYS overcome youth and skill....... CORTINA 250 2V POWER soon to be AUXR8 Windsor pwrd .............WINDSOR WARLORD WHO CARRIES THE CLEVO MAFIA AND BROKEN BOSSES... .................................................. Quote:
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13-01-2012, 04:12 PM | #29 | |||
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12-01-2012, 10:16 PM | #30 | ||
Just slidin'
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I ran 3.9's with mine, and nothing was different?
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