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DIiff ratios 

 

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 Post subject: DIiff ratios
Posted: Thu May 11, 2006 9:01 pm 
Oompa Loompa
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Hey i work on a lot of falcons and have found that the ratios vary a lot between the models. i have an el fairmont and i got it with a 3.23 single spinner. i plan on changing to a 3.45 XR8 LSD eventually. i was just wondering if anyone else has found that they have different gears from the standard 3.08 diffs?

 

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Posted: Thu May 11, 2006 11:11 pm 
Getting Side Ways
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i have a 3.23 v8 single spinner, according to the boys at ford some time in july 92, ford swapped over to the v8 diff instead of the I6 diff, the only difference is the v8 one is slightly stronger.

 

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Posted: Thu May 11, 2006 11:17 pm 
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3.08 was only the standard in later model e-series gli's. 2.77, 2.92, 3.08, 3.23, 3.27, and 3.45 are all used depending on model.

 

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Posted: Thu May 11, 2006 11:49 pm 
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i had a 3.27 and not got 3,45

 

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Posted: Fri May 12, 2006 3:27 am 
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go for a 3.7 ??? better take off, and not over the top for street use like a 4.11

 

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Posted: Fri May 12, 2006 4:20 am 
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ai guys i need to no wot RPM ppl do with there difs @ 100 km/h?

i currently do 2100rpm in 5th gear @ 100km/h, i suspect it ISNT a 3:27, i beilive its possibly a 3:45...

 

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Posted: Fri May 12, 2006 6:36 am 
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i think mine is a touch under 2000 rpm in 5th.. and i got a 2.92
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Posted: Fri May 12, 2006 8:11 am 
Oompa Loompa
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I change from a 3.08 single spinner to 3.23 LSD. I didn't change the speedo module (couldn't bother) so I just used a simple calc. to figure out rpm over speed as follows:

3.08 diff @ 100kph = 1750 rpm so....
1750rpm (100kph) / 3.08 = 568.1818 (32.4675)
568.1818 (32.4675) x 3.23 = 1835rpm (104.87kph)

so the result is when my speedo says 105, I'm doing 100 @ 1835rpm.

I hope that is simple to understand.

 

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Posted: Fri May 12, 2006 8:25 am 
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3.27 slippy diff in the Sprint,
3.08ss in the mont, changed to a 3.45ls.

 

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 Post subject: Re: DIiff ratios
Posted: Fri May 12, 2006 2:29 pm 
Getting Side Ways
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Nash_QCKSIX wrote:
Hey i work on a lot of falcons and have found that the ratios vary a lot between the models. i have an el fairmont and i got it with a 3.23 single spinner. i plan on changing to a 3.45 XR8 LSD eventually. i was just wondering if anyone else has found that they have different gears from the standard 3.08 diffs?


Ay if your gonna run with 18'' wheels you'd be better of with even shorter ratio than 3.45 coz of your distance travelled per wheel rotation. If you run 3.45 diff with 18'' wheels its a similar ratio to 15'' wheels runnin 3.08 diff. your losin out on take off coz of your wheel diameter.

 

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Posted: Fri May 12, 2006 4:53 pm 
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does anyone know where to get 3.45 gears new.

If i was to go from a 3.23ss to a 3.47lsd i cant use any of the old diff can i? So i cant just throw in gears and make em both spin.

How about if i had a 2.92 and got 3.47 gears?

 

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Posted: Fri May 12, 2006 10:56 pm 
Oompa Loompa
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yeah thanx buddy. 3.7 gears mite be the way to go. but i dont wanna spend too much money on this car i want a stockie au 5 litre. make a nice sleeper out of it. you can get new diff gears from preston diffs and trans but they won't be cheap. i got quoted $1200 or sumfin a new complete assembly.

 

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Posted: Sat May 13, 2006 7:55 pm 
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stockstandard Posted: Thu May 11, 2006 10:17 pm Post subject:

--------------------------------------------------------------------------------

3.08 was only the standard in later model e-series gli's. 2.77, 2.92, 3.08, 3.23, 3.27, and 3.45 are all used depending on model.


so what was the ratio on early model EF's do u no?
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Posted: Sat May 13, 2006 7:56 pm 
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ex-cabi wrote:
stockstandard Posted: Thu May 11, 2006 10:17 pm Post subject:

--------------------------------------------------------------------------------

3.08 was only the standard in later model e-series gli's. 2.77, 2.92, 3.08, 3.23, 3.27, and 3.45 are all used depending on model.


so what was the ratio on early model EF's do u no?


so what was the ratio on early model EF's do u no?
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Posted: Sat May 13, 2006 7:58 pm 
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I might be wrong, but of the top of my head -
3.08 for auto gli
3.23 for manual GLi's
3.23 for fairmonts, futuras, and XR8's
3.45 for XR6

 

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