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3.08 or 3.23 diff gears? 

 

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 Post subject: 3.08 or 3.23 diff gears?
Posted: Wed Jul 30, 2008 4:14 pm 
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Eb1 3.9 4spd auto runs at approx 1875rpm at 100km/h with 205/65/15 tyres. What diff gears do I have?
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Posted: Wed Jul 30, 2008 4:18 pm 
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My guess is 3.08. If you know what the 4th gear ratio is then you could work it out directly.
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Posted: Thu Jul 31, 2008 10:41 am 
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my Ef does around that rpm at 100km and i have 2.23 gears.
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Posted: Thu Jul 31, 2008 11:10 am 
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yeah i have 3.08 and its around 1750, i think your will be 3.23

unless they've been changed it should be written on the diff

 

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Posted: Thu Jul 31, 2008 11:14 am 
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nah its 3.08, my au sits at 1850 and has 16 inch slightly lower profile, and is 3.08.

do you have larger rims skidder? coz that will lower your highway rpm's. either that or your gauge is slightly out :P

 

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Posted: Fri Aug 01, 2008 2:47 am 
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look on the diff for a tag or on the drivers side axle.

 

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 Post subject: Re: 3.08 or 3.23 diff gears?
Posted: Fri Aug 01, 2008 10:28 am 
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Brett3158 wrote:
Eb1 3.9 4spd auto runs at approx 1875rpm at 100km/h with 205/65/15 tyres. What diff gears do I have?


if its the original diff its more than likely 2.92

my ea had 2.92 and sat on about 1875 rpm@100
when i fitted a 3.08 ratio it sat on 1950 rpm@100
and it now has a 3.27 and it sits on 2100 rpm@100

and yes i changed the speedo gear to suit the ratio
to keep the speedo correct

hope that helps
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Posted: Sat Aug 02, 2008 12:48 pm 
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Thanks for the replies guys.
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Posted: Sat Aug 02, 2008 2:01 pm 
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More Grunt wrote:
nah its 3.08, my au sits at 1850 and has 16 inch slightly lower profile, and is 3.08.

do you have larger rims skidder? coz that will lower your highway rpm's. either that or your gauge is slightly out :P


actually yeah i have 235/40/18....didn't think of that lol

 

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EVL098 wrote:
Cramping in the hand from having it on your Wang for an excessive period of time is a definate con.
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AU,factory fitted tickford kit/IRS, t5,Sports ryder/KYB: gone.

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 Post subject: Re: 3.08 or 3.23 diff gears?
Posted: Sat Aug 02, 2008 4:47 pm 
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TROYMAN wrote:

my ea had 2.92 and sat on about 1875 rpm@100
when i fitted a 3.08 ratio it sat on 1950 rpm@100
and it now has a 3.27 and it sits on 2100 rpm@100

and yes i changed the speedo gear to suit the ratio
to keep the speedo correct

hope that helps


Thanks for the info Troyman, just another question, did you have to do any mods other than the speedo gear in the auto to get the trans to shift at the right speed when changing diff ratios?
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 Post subject: Re: 3.08 or 3.23 diff gears?
Posted: Sat Aug 02, 2008 6:30 pm 
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Brett3158 wrote:
TROYMAN wrote:

my ea had 2.92 and sat on about 1875 rpm@100
when i fitted a 3.08 ratio it sat on 1950 rpm@100
and it now has a 3.27 and it sits on 2100 rpm@100

and yes i changed the speedo gear to suit the ratio
to keep the speedo correct

hope that helps


Thanks for the info Troyman, just another question, did you have to do any mods other than the speedo gear in the auto to get the trans to shift at the right speed when changing diff ratios?


mine is manual..
when you change your diff ratio you should change the speedo gear to suit and that should keep your shift points
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Posted: Fri Aug 08, 2008 6:39 pm 
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theres a calculator on here it was awsome for when i changed my diff gears. the changes it predicted were spot on so i'm still driving without the speedo gear for now till i get one. i had a c4 in the garage but someone got to it before me!

death to the 2.92s my fuel economy actually got better switching to a 3.23 lsd ! which i would imagine would be more rotating mass = more driveline drag. but the motor works much less doing the same thing now & it doesn't feel like your trying to pull a b double.

 

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