Determining Differential ratio
Thread Starter
Advanced
Joined: Mar 2004
Posts: 66
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From: Southaven MS
Determining Differential ratio
Is there an easy way to determine gear ratio? I bought the car used and don't have the window sticker. Can you tell by VIN, or code on car anywhere? Tach shows about 1950 rpm at 70 MPH.
Thanks :steering:
Thanks :steering:
Racer
Joined: Jul 2002
Posts: 303
Likes: 0
From: Sugar Land TX
Re: Determining Differential ratio (scliburn)
If it's a M6, then it's 3.42. If it's an A4, look in your glove compartment where all the RPOs are listed. If you see G92, it's got a 3.15 otherwise it's a 2.73.
Or you can throw it into 3rd (A4) and drive at 75mph. If you're turning 3150 RPM's you've got a 3.15, 2730 RPM = 2.73 ... and so on.
[Modified by KKu77, 4:09 PM 3/10/2004]
Or you can throw it into 3rd (A4) and drive at 75mph. If you're turning 3150 RPM's you've got a 3.15, 2730 RPM = 2.73 ... and so on.
[Modified by KKu77, 4:09 PM 3/10/2004]
Thread Starter
Advanced
Joined: Mar 2004
Posts: 66
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From: Southaven MS
Re: Determining Differential ratio (KKu77)
It's an A4. I looked in the glove box but didn't see any listings of any kind. Could the list be elsewhere, or is it hard to see?
Thanks :steering:
Thanks :steering:
Safety Car
Joined: Feb 2003
Posts: 3,865
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From: Chicago il
Re: Determining Differential ratio (KKu77)
If its an MN6 out it in fourth and set the cruise at 80 mph, for an a4 put it in 3 and set the cruise at 80 mph, what ever you tach it at divide by 100 and that is your rear end ration. So for example an MN6 should sit at exactly 3420 rpm at 80mph in 4th gear. so your ratio is 3:42.
Safety Car
Joined: Nov 2000
Posts: 4,772
Likes: 343
From: SIOUX FALLS SD
Cruise-In II Veteran
Cruise-In III Veteran
Re: Determining Differential ratio (scliburn)
The correct code is G92 and it located under one of the lift off compartment lids in the rear area of the coupe. If I remember correctly it is the compartment on the left and if not check the others. If it's not a G92 code
you have the 2:73 ratio. Hopefully you have the G92...this is a much better rear end and costs as an option only $100.00 extra. :thumbs:
you have the 2:73 ratio. Hopefully you have the G92...this is a much better rear end and costs as an option only $100.00 extra. :thumbs:
Team Owner
Joined: Mar 1999
Posts: 28,753
Likes: 9
From: San Jose/Bear Valley CA
CA Events Coordinator
Re: Determining Differential ratio (Monster231)
If its an MN6 out it in fourth and set the cruise at 80 mph, for an a4 put it in 3 and set the cruise at 80 mph, what ever you tach it at divide by 100 and that is your rear end ration. So for example an MN6 should sit at exactly 3420 rpm at 80mph in 4th gear. so your ratio is 3:42.
VR :cheers:
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Drifting
Joined: Jan 2004
Posts: 1,422
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From: SouthWest FL
Re: Determining Differential ratio (joeking)
:iagree:
But I believe it was a $300 option and yes it was still worth it. Wish mine had it. Sounds like he has the 3.15 if it is at 1950 at 70 in 4th gear I assume. Mine will run close to 80 at same RPM (2.73 gears :( )
But I believe it was a $300 option and yes it was still worth it. Wish mine had it. Sounds like he has the 3.15 if it is at 1950 at 70 in 4th gear I assume. Mine will run close to 80 at same RPM (2.73 gears :( )
Safety Car
Joined: Nov 2000
Posts: 4,772
Likes: 343
From: SIOUX FALLS SD
Cruise-In II Veteran
Cruise-In III Veteran
Re: Determining Differential ratio (Monster231)
NPH2005..we are both right. It was $100.00 option in 97 and later on
the option increased to $300.00. I dont have the black book with me
but after reading the post I remembered that tidbit of information. Worth
every penny! :thumbs:
the option increased to $300.00. I dont have the black book with me
but after reading the post I remembered that tidbit of information. Worth
every penny! :thumbs:
