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changing diff ratio in xd v8 

 

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 Post subject: changing diff ratio in xd v8
Posted: Tue Jun 26, 2007 5:39 pm 
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i have a xd fairmont ghia with a disc brake rear end. is this a 2.92:1 LSD? pretty sure it is...

I want better take off so i was thinking a 3.23 or 3.45 or 3.5...

Assuming i was just gonna change the centre, which diffs will fit and out of which cars?

thanks chris
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 Post subject: Re: changing diff ratio in xd v8
Posted: Tue Jun 26, 2007 7:20 pm 
Getting Side Ways
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[quote="chr!s"]i have a xd fairmont ghia with a disc brake rear end. is this a 2.92:1 LSD? pretty sure it is...

I want better take off so i was thinking a 3.23 or 3.45 or 3.5...

Assuming i was just gonna change the centre, which diffs will fit and out of which cars?

thanks chris[/quote


Have you had a look at the diff ID tag on the inspection cover??? The ratio is stamped on it. Usually they were 2.77, sometimes 2.92.
If its 2.92, your in luck, the gears from an EB, ED will fit.
I have fitted a set of EB 3.27's to an XD diff LSD B/W before.

 

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Posted: Wed Jun 27, 2007 6:55 pm 
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9 inch time i reckon
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Posted: Tue Oct 23, 2007 9:21 pm 
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rather than changing the diff ratio i would recommend a real good tune up. Those engines have a s**t amount of torque and will pull from almost no revs. The standard carby on these things will not react well to being played with. I would recommend a 650 Holley (depending on want you want) for a fair bit of mumbo and reliability.
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Posted: Tue Oct 23, 2007 10:00 pm 
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i would also recommend a carby upgrade, but if you still wanna stick to diffs, get 3.5 gears if you want quick launches. the rpm is a bit high on the highway but i hardly drove mine above 80km/h so i never really had a problem with it.

 

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Posted: Tue Oct 23, 2007 11:44 pm 
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if it is a factory 351 it is a 28 spline 4 pinion like the eb series 2 onwards. if it was a 302 it has the 25 spline 2 pinion centre same up to the eb serie 1. just get a wagon or ute diff out of the e series
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