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Diff ratio 

 

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 Post subject: Diff ratio
Posted: Tue Dec 29, 2009 10:36 pm 
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Hey i have looked on the net but cant seem to find anything. Can someone tell me how much off my speedo would be when changing the diff ratio from 3.23 to 3.08?

Thanks

 

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 Post subject: Re: Diff ratio
Posted: Tue Dec 29, 2009 10:38 pm 
Tyre Shredder
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i dont have much experience in his but its only 30 bucks for a new speedo gear and probly 30mins to install

 

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 Post subject: Re: Diff ratio
Posted: Tue Dec 29, 2009 10:44 pm 
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 Post subject: Re: Diff ratio
Posted: Wed Dec 30, 2009 12:05 am 
Getting Side Ways
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kelv_05ef_wagon wrote:
i dont have much experience in his but its only 30 bucks for a new speedo gear and probly 30mins to install

I have just put the diff in to buy me some time to find someone to rebuild the one that s**t itself. Its too hard to find anyone now there mostly on holidays.

Olive Xm wrote:
http://www.fordmods.com/documents.php?d=30


Thanks for that didnt even see that. Looks like i wont be too bad only 1kph or so out.

 

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 Post subject: Re: Diff ratio
Posted: Wed Dec 30, 2009 9:45 am 
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The car will be going about 5km/h faster than it says, you just divide the old ratio by the new ratio.

 

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 Post subject: Re: Diff ratio
Posted: Wed Dec 30, 2009 9:51 am 
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this should still be relevant for your car,
post974038.html?hilit=drive%20gear#p974038

 

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 Post subject: Re: Diff ratio
Posted: Thu Dec 31, 2009 2:22 am 
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shyun wrote:
The car will be going about 5km/h faster than it says, you just divide the old ratio by the new ratio.


Hows that meant to work?
So my old ratio (3.23) and new ratio as of a couple hours ago :twisted: (3.91)
i'd have a difference of 8 km/h???
The bigger the ratio the more accurate :?
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 Post subject: Re: Diff ratio
Posted: Thu Dec 31, 2009 11:29 am 
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revan8_NL wrote:
shyun wrote:
The car will be going about 5km/h faster than it says, you just divide the old ratio by the new ratio.


Hows that meant to work?
So my old ratio (3.23) and new ratio as of a couple hours ago :twisted: (3.91)
i'd have a difference of 8 km/h???
The bigger the ratio the more accurate :?

well if you just did that then your speedo will over-read by about 17%. The speedo gear goes into the gearbox, so it works off how fast that gearbox is rotating. If you put a different diff in without changing the speedo gear then the car will be going slower/faster than it would with the original diff-so the speedo is off.

 

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 Post subject: Re: Diff ratio
Posted: Thu Dec 31, 2009 12:48 pm 
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The speedo will read slower if you put a 3.08 instead of the stock 3.23. :D
And if you change the speedo gear the shift patterns will be out in the auto :( but the speedo will be correct :?
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