The Definitive AU Diff Topic - Page 2

Day-mow · 13-01-2012, 12:53 PM

Put a manual in and no issues XD

TheSneakiness · 13-01-2012, 01:03 PM

I went from a 3.23 single spinner to a 3.45 LSD in my AU ute and only replaced the speedo cog in the auto, no problems

5.8 · 13-01-2012, 02:54 PM

I read somewhere that a LSD in an XR6 VCT became an optional extra in AU3's. Can anyone verify this?

needaXYGT · 13-01-2012, 03:27 PM

I noticed that 4.11 was mentioned in the second post! Does anyone know what model these were fitted to?

zakjames · 27-01-2012, 05:36 PM

So just wondering guys.
I have a series 2 XR8 ute auto beam axle, any idea what diff they come with standard and what ratios I could fit in?

I only ask because I didnt see any mention of the utes.
Cheers guys.

Sox · 27-01-2012, 09:38 PM

Quote:

Originally Posted by zakjames

So just wondering guys.
I have a series 2 XR8 ute auto beam axle, any idea what diff they come with standard and what ratios I could fit in?

I only ask because I didnt see any mention of the utes.
Cheers guys.

It will be 3.45:1, and LS.

You should be able to slide in anything up to 4.1:1.

Ride · 27-01-2012, 10:13 PM

Just another one for the records. My AU II Fairmont Ghia also came with a 3:45 LSD, was a bit surprised when I got underneath it the other week when I was pulling the tailshaft off. I suspect the reason why it received one is due to the Tickford 17's and sports suspension + IRS that it received (options on the Tickford compliance plate).

5.0 ED · 27-01-2012, 10:27 PM

Something i'll point out that was originally mentioned about the 3.08 diff's, its actually not the casing that is different it is the centre itself, you can pull the actual centre out and replace it with a different say 3.45 centre and use the other diff gears.

Commodore 3.45 VL gears that fit are non turbo and 75 series, they are super weak and break very easily, i really dont recommend this path.

My diff in my ED is a 3.08 factory unit, i replaced the centre with a LSD unit out of a 3.45 XR6 EF from memory, and install 3.45, then 3.89 and then 3.91 diff gears into it.

The 3.45's broke, the 3.89's broke and wear always noisy, and the 3.91's are nice quiet and super strong. unlike the weaker made 3.45's and 3.89's. The key point here is, there are stronger made 3.45's in ford's and weak one's in commodore's except Turbo's and so on.

All v8 ghia's both fairlane and fairmont i have see have had 3.23 single spinners...

greenguzzler · 17-07-2012, 12:49 PM

Quote:

Originally Posted by 5.0 ED

Something i'll point out that was originally mentioned about the 3.08 diff's, its actually not the casing that is different it is the centre itself, you can pull the actual centre out and replace it with a different say 3.45 centre and use the other diff gears.

Commodore 3.45 VL gears that fit are non turbo and 75 series, they are super weak and break very easily, i really dont recommend this path.

My diff in my ED is a 3.08 factory unit, i replaced the centre with a LSD unit out of a 3.45 XR6 EF from memory, and install 3.45, then 3.89 and then 3.91 diff gears into it.

The 3.45's broke, the 3.89's broke and wear always noisy, and the 3.91's are nice quiet and super strong. unlike the weaker made 3.45's and 3.89's. The key point here is, there are stronger made 3.45's in ford's and weak one's in commodore's except Turbo's and so on.

All v8 ghia's both fairlane and fairmont i have see have had 3.23 single spinners...

I have an AU Fairlane V8 series 1 with 3.23 LSD and traction control. I am the second owner.

BHDOGS · 28-01-2012, 10:23 AM

I have an au 2 fairmont v8 live axle I assume I have the 3.08 diff as nothing's written on my diff housing and there's no LSD tag so this means I can rip the center out and just put any 3.45 LSD center in from another live axle 6 or 8 live axle au?

Dave_Obsession · 28-01-2012, 10:51 AM

Pretty sure that's right. As it's only the centre, I'm also fairly sure it doesn't necessarily have to be from a live axle AU.

Fairly sure if you stick a 3.45 centre into a 3.08 open diff, you'll end up with a 3.45 single spinner (ie not LSD).

FWIW, I asked my mechanic about this topic, he said it's a real pain to change a diff centre over, easier to get a replacement diff and they can install that....so that's what I did! Not installed yet but soon!

5.0 ED · 28-01-2012, 12:04 PM

AU 2 fairmont V8 live axle should be 3.23 LSD.

BHDOGS · 28-01-2012, 05:03 PM

Hmm really? It's got tickford suspension from factory if that makes a difference how can I check if there's no markings on diff?

**auIILTD** · 16-07-2012, 09:20 PM

Does anyone have any idea what this Diff is from? I am guessing as it does not have LSD on the tag, it is a single spinner. Does anyone know what the high performance tag means?

Stu

ic0nic · 17-07-2012, 10:39 AM

Hey guys, I'm exploring the possibility of throwing a LSD into my 02' AUIII. What would my options be here? I'm a little sketchy on the details that I need.

blueoval · 17-07-2012, 11:30 AM

Quote:

Originally Posted by ic0nic

Hey guys, I'm exploring the possibility of throwing a LSD into my 02' AUIII. What would my options be here? I'm a little sketchy on the details that I need.

Try and source a complete diff assembly from an XR6 rather than muck around getting diff centers changed. That is what I did. All I did then was gave the new diff some fresh oil and it was all good.

Day-mow · 21-07-2012, 09:23 PM

3.23 say i want to be sporty but i really just dont cut it.
you need minimum 3.45. a real man would put in 3.9's

Cookie-XR8 · 22-07-2012, 10:55 PM

mine is getting 4.11's and a mini spool, all you will ever need.

falconnut · 23-07-2012, 12:20 AM

my car in sig is stock what would be the cheapest lsd diff i could get put in? Not really interested in higher ratio just the stock ratio in lsd

BHDOGS · 23-07-2012, 12:43 AM

a second hand one out of another falcon would be the easier and cheapest one to do.

falconnut · 23-07-2012, 01:01 AM

k thanks.

zakjames · 31-07-2012, 08:00 PM

Does anyone know what size the actually crown wheel is?
I keep seeing kits for 8" and 8.8" ford diffs ?

**auIILTD** · 20-12-2012, 01:01 PM

Sorry to drag an 'oldish' thread, but I note that both Dave_Obsession and Rapid Axe have both change the speedo gear when going to 3.45. Can either tell me the number of teeth and / or colour of the speed gear that goes with the 3.45?

Cheers
Stu

ebgtjames · 20-12-2012, 01:05 PM

23 teeth - Black, haven't we been through this in your build thread Stu?

**auIILTD** · 20-12-2012, 04:10 PM

Quote:

Originally Posted by ebgtjames

23 teeth - Black, haven't we been through this in your build thread Stu?

Yes we have been through this James, but I have heard conflicting stories. I have not discounted your input, just seeking confirmation. Some of what I have heard may mean colours were changed? The afore mentioned guys have done this to an AU.

Do it once, do it right. Forums are a free source of info, cannot hurt to ask.

Stu

ebgtjames · 20-12-2012, 05:20 PM

Yea fair enough Stu might be different with the Au?

The EB GT Autos have 3.45s, 17x8.5 rims with 245/40/17 tyres from the Factory, the "Technicians Data Guide" that comes with them shows the Auto as having the 23 teeth Speedo Drive, this was confirmed when we took the Auto out and changed to Manual (black gear) and I re-used it in the T5, with Chad manning the Quarterhorse he confirmed my Speedo to be spot on ..

Yours will still be out with that gear as you've got a larger diameter rim/tyre combo

**auIILTD** · 20-12-2012, 05:23 PM

Cheers James. If I find any different, I will be sure to post it here for future reference. Still keen to hear Dave and Rapid Axes input.

Cheers and Merry Christmas.

Stu

**auIILTD** · 07-02-2013, 05:08 PM

Quote:

Originally Posted by auIILTD

Cheers James. If I find any different, I will be sure to post it here for future reference.
Stu

Nearly forgot about this. For my AU with BTR97LE (should be same for all I believe):
3.23 Diff - Brown Speedo gear with 20 teeth.
3.45 Diff - Dark Grey speedo gear with 22 Teeth.

Stu

Dave_Obsession · 21-12-2012, 01:39 PM

Still haven't done mine yet - the diff is sitting round the back of our house

The diff and speedo cog I got were from an S1 XR6 HP...speedo cog is grey and has 22 teeth...hmmm maybe I was given the wrong one?

**auIILTD** · 21-12-2012, 03:51 PM

Quote:

Originally Posted by Dave_Obsession

Still haven't done mine yet - the diff is sitting round the back of our house

The diff and speedo cog I got were from an S1 XR6 HP...speedo cog is grey and has 22 teeth...hmmm maybe I was given the wrong one?

Thanks Dave. Grey and 22 teeth rings a bell as to the conflicting information that I have. I guess I just have to stop being lazy and get under my car and pull the 3.23 speedo gear out, count the teeth and get one with one more tooth.

Cheers
Stu