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diff ratio on ba xr8 

 

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 Post subject: Re: diff ratio on ba xr8
Posted: Mon Dec 26, 2016 8:36 pm 
EFI Guru
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Age: 51

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Joined: 5th Nov 2004

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Ride: 351 Vogue,XH 5.0,'17 5.0 Stang

Location: Perth
WA, Australia

Depends what you've done to the engine?
Being a 3V the diff ratio is an even taller 2.54:1 than the 4V cars which have 2.73:1.
If you have done cams and head porting etc to lift the power band up then a 2.73 is a good choice.
It would have to be quite radical to make use of the next step which, unfortunately is a big jump to 3.46:1.
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