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changig diff gears and cluster readings? 

 

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 Post subject: changig diff gears and cluster readings?
Posted: Mon Jan 04, 2010 3:38 pm 
Getting Side Ways
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hi all,

this was raised at a party i was at on the weekend...

my car is a series one EL and had a 3.25 diff fit by the previous owner...

the speedo underreads (ie. at 100kph indicated on the cluster it is actually only doing about 90-91 kph)

does this mean my car would not have done as many kilometers as the odometer says so? (ie has the car done less milage than it says)

not something i had considered before
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 Post subject: Re: changig diff gears and cluster readings?
Posted: Wed Jan 06, 2010 10:09 am 
Getting Side Ways
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any ideas? i suppose it depends on where the odometer gets it information from
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 Post subject: Re: changig diff gears and cluster readings?
Posted: Wed Jan 06, 2010 10:24 am 
Getting Side Ways
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short answer yes, but how significant of a difference, depends.
how many k's since the diff was fitted etc.

 

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 Post subject: Re: changig diff gears and cluster readings?
Posted: Wed Jan 06, 2010 6:13 pm 
Getting Side Ways
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problem is i have no idea, what sort of difference in milage would we be talking from 3.27 to 3.45 over lets say 100,000 actual?
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 Post subject: Re: changig diff gears and cluster readings?
Posted: Wed Jan 06, 2010 6:50 pm 
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Transmission could have been changed too.

Your car may have a speedo driven gear to suit a 3.08 diff, hence the lower actual K's.

Here's a guide for the correct gear to be fitted.

gearbox-suspension-brake-driveline-f4/ef-el-1994-1998-speedo-sender-drive-driven-gear-t71134.html?hilit=driven

And as above yes, your car has actually done LESS k's than indicated, bare in mind MOST people change instruments in a car, especially if there has been diff change.

Police clusters are also good for correcting the gauge

documents.php?d=14

 

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