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what dif do i need 

 

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 Post subject: what dif do i need
Posted: Fri Mar 27, 2009 10:37 pm 
Oompa Loompa
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Age: 39

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Ride: 92 ford fairmont eb 11

Location: Yeppoon
QLD, Australia

I just bought a 92 eb11 fairmond and was wondering what diff it might have its a 4 speed auto
and takes of fairly slow . and whats the best way to improve it (GEAR RATIO?)
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 Post subject: Re: what dif do i need
Posted: Fri Mar 27, 2009 11:06 pm 
Getting Side Ways
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Location: Brisbane
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Depends on what you want man, alot of guys on here straight up fit 4:11's and go nuts, some guys have 3:7's, it depends on whether you want the most accel out of it compared to revs at 100, or the other way round. You could also opt for the 3:45 XR ratio.

 

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 Post subject: Re: what dif do i need
Posted: Fri Mar 27, 2009 11:18 pm 
Oompa Loompa
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Age: 39

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Joined: 25th Mar 2009

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Ride: 92 ford fairmont eb 11

Location: Yeppoon
QLD, Australia

im not to sure about the reves i want but would like it to go from 0 to 60 a bit quiker.
whats the xr6 set up like
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 Post subject: Re: what dif do i need
Posted: Sat Mar 28, 2009 1:02 am 
Getting Side Ways
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hey, for street, you'll find a good improvement would be to go for 3:45s.

for strip, definitely 4:11s

for a bit of both, go the 3.7-3.9s.

you just need to find someone competent enough to fit the gears properly.

 

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 Post subject: Re: what dif do i need
Posted: Sat Mar 28, 2009 12:09 pm 
Oompa Loompa
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Age: 39

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Joined: 25th Mar 2009

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Ride: 92 ford fairmont eb 11

Location: Yeppoon
QLD, Australia

cheers mate thanks for the info . one other question how do i tell what diff i have in my eb 11
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 Post subject: Re: what dif do i need
Posted: Sat Mar 28, 2009 3:05 pm 
Parts Gopher
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Location: Newcastle
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On your diff there should be a tag telling you what your diff is eg Lsd & the ratio.
I just bought a diff out of an eb it is a 3.45 Lsd as need to replace my Lsd as its stuffed.
Dave.

 

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 Post subject: Re: what dif do i need
Posted: Sat Mar 28, 2009 3:40 pm 
Oompa Loompa
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Age: 39

Posts: 20

Joined: 25th Mar 2009

Gallery: 1 images

Ride: 92 ford fairmont eb 11

Location: Yeppoon
QLD, Australia

cheers dave im gunna go look right now .ill let u no wat shes got under there
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 Post subject: Re: what dif do i need
Posted: Sat Mar 28, 2009 3:57 pm 
Oompa Loompa
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Age: 39

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Joined: 25th Mar 2009

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Ride: 92 ford fairmont eb 11

Location: Yeppoon
QLD, Australia

WHAT WOULD A LSD 3:45 DIFF TAG HAVE ON WRITTEN ON IT

Last edited by eb111 on Sat Mar 28, 2009 4:05 pm, edited 1 time in total.

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 Post subject: Re: what dif do i need
Posted: Sat Mar 28, 2009 4:01 pm 
Oompa Loompa
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Age: 39

Posts: 20

Joined: 25th Mar 2009

Gallery: 1 images

Ride: 92 ford fairmont eb 11

Location: Yeppoon
QLD, Australia

sweet man found the diff tag but im still not sure what diff i got so if any one can tell me wat all these numbers mean that would be great
P/91DA-4005-AAA
3 27:1S/N 1651
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 Post subject: Re: what dif do i need
Posted: Sat Mar 28, 2009 6:35 pm 
Parts Gopher
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Location: Newcastle
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eb111 wrote:
sweet man found the diff tag but im still not sure what diff i got so if any one can tell me wat all these numbers mean that would be great
P/91DA-4005-AAA
3 27:1S/N 1651



3 27 I think is your Ratio
Your diff will be a borgwarna standard ford.
Dave.

 

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 Post subject: Re: what dif do i need
Posted: Sat Mar 28, 2009 7:33 pm 
Oompa Loompa
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Age: 39

Posts: 20

Joined: 25th Mar 2009

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Ride: 92 ford fairmont eb 11

Location: Yeppoon
QLD, Australia

cheers dave .
so now that i no that my diff is stockstandard .whats the best way to up grade to a 3:45?
low budget is good for me .im thinking diff from wrekers with 3:45 ratio.
or wreked xr6 .is that my best option
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 Post subject: Re: what dif do i need
Posted: Mon Mar 30, 2009 10:14 am 
Getting Side Ways
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I dont think you will notice much of an improvement going to a 3.45 ratio over a 3.27. I would suggest a 3.7 ratio which is still quite streetable.

I recommend getting a diff specialist to supply and fit your diff gears. They know the tolerances and what is needed to make things work. They can also shim up your limited slip tightly so its almost like a locked diff :mrgreen:

Might need to speak to someone who is in your state who knows of a recommended fitter.

 

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 Post subject: Re: what dif do i need
Posted: Mon Mar 30, 2009 10:20 am 
Getting Side Ways
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Minimum diff ratio in my opinion behind an eseries auto is 3.73. This ratio is very streetable and motor will only rev at 2100rpm @ 100kph which is nothing to worry about. 3.45's behind the auto is a crap upgrade and not worth the money..... cause when you have such a s**t 1st gear ratio (2.39) you need to go very short diff ratio to help things move along.

If you want ideal diff gears for the 1/4 mile behind an auto, then something like 4.5 diff ratio would be ideal, but im not sure if anything exists in that ratio, so 4.11's would be the next best option
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 Post subject: Re: what dif do i need
Posted: Mon Mar 30, 2009 10:32 am 
Getting Side Ways
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Ride: AU2 75th Anniversary Futura

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you know I agree with you there. I have 3.45 ratio on mine, and I cant even feel the difference till I hit about 40kph. A set of 4.44 is the lowest ratio I have seen, but that was on a 9in diff.

If I was to spend more money on the diff for me, I would go 3.7 or 3.9s.

 

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 Post subject: Re: what dif do i need
Posted: Mon Mar 30, 2009 10:42 am 
Getting Side Ways
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yeah ive got 3.73's and while it does make it alot more 'zippy' around town than the stock 3.23 ratio, its still pretty lame...... so the car is in the workshop right now getting 4.11 lsd fitted :twisted:

Also worked out it should be better for the 1/4 mile because it will be crossing the line near the top of 3rd gear, as opposed to the lower revs of 3rd with taller gears like 3.7, 3.45's etc.

Only downside of the 4.11's is the tailshaft will see the same stresses @ 141kph, as it would have @ 180kph with stock 3.23 diff gears.... so i will be fitting new uni's, getting tailshaft balanced, and a tailshaft loop fitted as soon as i can
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