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Difference between a 3.27 ratio diff and 3.45 ratio diff?? 

 

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 Post subject: Difference between a 3.27 ratio diff and 3.45 ratio diff??
Posted: Sun Mar 25, 2012 12:07 pm 
Parts Gopher
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Hey guys. Wondering what the big difference is between these two LSD's

-3.27
and
-3.45

??

Ive already got a 3.27 in a ute shell im thinkin of transferring into a sedan shell so i can use on my car.., is it worth tryin to fins a 3.45 or is there sweet f**k all difference?? thanks.
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 Post subject: Re: Difference between a 3.27 ratio diff and 3.45 ratio diff??
Posted: Sun Mar 25, 2012 12:33 pm 
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Basically the difference is .18 to be exact if that helps :roll: .

Is the sedan a manual or auto, Thats is what will make the final decision.

I assume auto 3.27 and manual 3.45.

3.27 in a manual will be a bit more sluggish but will save some fuel. 3.45 in an auto will show some better accelaration. I do believe that the autos came out with 3.08 in sedans but im not sure about the different ratios for uterus's. Is the ute a 5 speed manual?

Need more details to make the call Bro.

Cheers Joel

 

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 Post subject: Re: Difference between a 3.27 ratio diff and 3.45 ratio diff??
Posted: Sun Mar 25, 2012 5:20 pm 
Parts Gopher
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ive got a manual sedan.. with just the standard 3.08 as it was an auto and i did manual conversion.. lol.. what wuld be better is manual? 3.27 LSD or 3.45 LSD, much difference?? power wise and fuel wise? thanks

ps i got the diff from a ute.. it was a manual ute with 3.27 lsd. was an xg ute.
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 Post subject: Re: Difference between a 3.27 ratio diff and 3.45 ratio diff??
Posted: Sun Mar 25, 2012 5:24 pm 
Getting Side Ways
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Justin74 wrote:
ive got a manual sedan.. with just the standard 3.08 as it was an auto and i did manual conversion.. lol.. what wuld be better is manual? 3.27 LSD or 3.45 LSD, much difference?? power wise and fuel wise? thanks

ps i got the diff from a ute.. it was a manual ute with 3.27 lsd. was an xg ute.

the xr6's manual and auto both got the 3.45 lsd, i personally would choose this altho the 3.27 ratio and lsd will be MUCH better than a 3.08 open pegger, i have a 3.08 in my el gli sedan and im looking at fitting the 3.45 lsd soon when i get a few minor problems sorted with the car

 

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 Post subject: Re: Difference between a 3.27 ratio diff and 3.45 ratio diff??
Posted: Sun Mar 25, 2012 5:32 pm 
Parts Gopher
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thanks heaps :)) really helps :)

the only reason im thinkin of using the 327 is cause i already got it.. and its a good tight diff and it didnt cost me anything.. and money wise if i wanna get a 345 id have to buy one.. lol..

if yu already had a 327 wuld yu use it or would you try finding a 345?

thanks
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 Post subject: Re: Difference between a 3.27 ratio diff and 3.45 ratio diff??
Posted: Sun Mar 25, 2012 5:45 pm 
Getting Side Ways
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id definatly use it, but you do realise the ute diff wont be a direct fit? the diff housing wont fit under a sedan and bolt up as far as i know because the ute/wagon has leaf springs and the sedan runs coils so the housings are different..otherwise if you have the right tools you can swap the centre out of the ute diff into the sedan and it will fit fine

 

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 Post subject: Re: Difference between a 3.27 ratio diff and 3.45 ratio diff??
Posted: Sun Mar 25, 2012 5:50 pm 
Getting Side Ways
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i've gone from 3.08 to 3.45...didn't really feel much difference.
it's the lsd i was really after, an open diff with manual is a C***
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 Post subject: Re: Difference between a 3.27 ratio diff and 3.45 ratio diff??
Posted: Sun Mar 25, 2012 5:54 pm 
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Troy wrote:
i've gone from 3.08 to 3.45...didn't really feel much difference.
it's the lsd i was really after, an open diff with manual is a C***

i know, dont remind me :|
lol

 

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 Post subject: Re: Difference between a 3.27 ratio diff and 3.45 ratio diff??
Posted: Sun Mar 25, 2012 5:57 pm 
Parts Gopher
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id definatly use it, but you do realise the ute diff wont be a direct fit? the diff housing wont fit under a sedan and bolt up as far as i know because the ute/wagon has leaf springs and the sedan runs coils so the housings are different..otherwise if you have the right tools you can swap the centre out of the ute diff into the sedan and it will fit fine

REPLY:
yeah i knew that already.. ive near transferred it all over to a sedan shell... just gotta put the axels back in and its done..
thanks heaps for the answers :)
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 Post subject: Re: Difference between a 3.27 ratio diff and 3.45 ratio diff??
Posted: Sun Mar 25, 2012 5:58 pm 
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Justin74 wrote:
id definatly use it, but you do realise the ute diff wont be a direct fit? the diff housing wont fit under a sedan and bolt up as far as i know because the ute/wagon has leaf springs and the sedan runs coils so the housings are different..otherwise if you have the right tools you can swap the centre out of the ute diff into the sedan and it will fit fine

REPLY:
yeah i knew that already.. ive near transferred it all over to a sedan shell... just gotta put the axels back in and its done..
thanks heaps for the answers :)

ok thats good, let us know how it goes, wether you feel a difference in acceloration or economy :D

 

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 Post subject: Re: Difference between a 3.27 ratio diff and 3.45 ratio diff??
Posted: Sun Mar 25, 2012 8:34 pm 
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I believe I run an 3.27LSD (or 3.23?) with a manual. It is a bit sluggish, but definitely not as sluggish as the auto, off the line. After doing the manual conversion, RPM at highway speeds is 2000RPM, on the auto it was 1750 I believe or something.

I was thinking of changing to 3.45s but because I did most of highway driving, 3.27s were better. Now I need 3.45s with more stop start/metro driving but money is no where to be found.

 

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 Post subject: Re: Difference between a 3.27 ratio diff and 3.45 ratio diff??
Posted: Sun Mar 25, 2012 10:23 pm 
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EBII's had 3.27 gears with the 4sp auto's....a mate has one, factory original.
Another mate had an EF ExPolice sedan, it had 3.23 LSD, auto.
My ED was auto with 3.08.....it's now 5sp with 3.27 LSD......goes way better than auto.
EB1 XR8 had 3.27's as well.

 

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 Post subject: Re: Difference between a 3.27 ratio diff and 3.45 ratio diff??
Posted: Mon Mar 26, 2012 12:07 am 
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both my ef fairmonts ran 3.23 open slippers from memory, the el gli manual runs 3.08 and its all factory manual and diff, its alot better than the autos i had but it definatly runs too far through the gears for my liking and id love 3.45 gears for around town as thats 99% of my driving, just needs a little less pedal effort to get up to speed and id be happy,

 

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