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Old 02-02-2004, 21:29   #1 (permalink)
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confused What diff to shove between the legs???

I have a 3 Speed MPFI Ea Falcon, I will not be converting this to a 5 Speed Manual, but maybe putting a shift kit and shifter in etc... What diff would you recomend to pull harder and faster.

I still sorta want to go on freeways doin 100 or 110, but hardly ever do only on that one holiday occasion, what you recomend? and what does it do the the car sitting on high revs down the freeway???
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Old 02-02-2004, 21:58   #2 (permalink)
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Re: What diff to shove between the legs???

Having a 3 speed, your options aren't too great. My car's a 4 speed with a 3.08 and when I had it in limp mode (stuck in third) even then it was starting to sh!t me up the wall at 100km/h. 3:27's will still be revin pretty high, but would be the ABSOLUTE max i'd go. Anything above that would just be stupid! (no offence to anyone who's done it )
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Old 02-02-2004, 21:59   #3 (permalink)
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Re: What diff to shove between the legs???

knowing sfa about diffs all i can say is that the EF one is good for everything from cruising around to flogging ricers, well it does the job for me anyway, and it will take a shift kit. Im 98% sure mine is 3.45 but I could be wrong - whatever the standard EF Futura diff is, thats what ive got and it does the job fine.
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Old 02-02-2004, 22:03   #4 (permalink)
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Re: What diff to shove between the legs???

The 3 speed doesn't really give you much to play with. From memory most of the 3 speeders had 2.77 to 3.08 (My EA 3 speed fairmont Ghia had 3.08). You could probably go to 3.23, 3.45's would be a bit steep I would think but you may get away with it.
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Old 02-02-2004, 22:31   #5 (permalink)
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Re: What diff to shove between the legs???

I had a 3.23 behind a 3 speed. From memory it sat on about 2500-3000rpm at 100km/h. I know it topped out at a whopping 165km/h @ 4900rpm!! LOL.
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Old 02-02-2004, 23:25   #6 (permalink)
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Re: What diff to shove between the legs???

What did the EB fairmonts come out with? It sits on 1800 RPM at 100kph, buggered if I can figure out the maths.
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Old 02-03-2004, 00:27   #7 (permalink)
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Re: What diff to shove between the legs???

If you were thinking 5 spd, wait till after that.
I personally would get a manny over the 3spd anyday.
1st gear is way too tall, and coz it has 3 gears u get shitfull economy. (i had 1) Even put a 4spd in, as i think its not worth spending any mulla on modding the 3spd box.

The when u get the manny done, and still want more go, get 3.7s :)

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Old 02-03-2004, 01:25   #8 (permalink)
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Re: What diff to shove between the legs???

My EBII Fairmont has a 3.27:1 Single Spinner, but they probably put a few different types in.
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Old 02-03-2004, 03:37   #9 (permalink)
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Re: What diff to shove between the legs???

1800rpm @ 100 sounds like a 3.08.
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Old 02-03-2004, 06:05   #10 (permalink)
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Re: What diff to shove between the legs???

yhee jus put the 4-speed in
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