GEARS and ET.
HOOK-EM HORNS
Joined: Aug 2006
Posts: 3,517
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From: Port Aransas, Texas Tx
St. Jude Donor '08
Picking up my 08 A6 monday from Z06parts, with stall convert and 3:15 gears. I have not even seen the car in person much less driven it but I knew I wanted gears and stall.
Can't wait for a little break in and then......
Can't wait for a little break in and then......
Thread Starter
Safety Car
Joined: Sep 2006
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From: Cheektowaga NY
St. Jude Donor '08
Thread Starter
Safety Car
Joined: Sep 2006
Posts: 3,921
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From: Cheektowaga NY
St. Jude Donor '08
Well i would like to say thank you to all that posted and helped out. I gained alot of knowledge out of this thread. I have never changed gears nor have i ever added a stall converter, so again Thanks Guys for all the help and the graphs 
Drifting
Joined: Nov 2004
Posts: 1,753
Likes: 2
From: Fresno CA
NO, hi Dennis!
I had 2800 Vig in my last two Vettes and the temps were NEVER high or out of control except on a road course. For just strip use and around town even in our 110 plus degree heat in the summer my tranny would never run hot.Now on the road course now thats a diff story. A tranny cooler is a good idea and is not too hard to install or very expensive so it is a good idea just not absolutely needed in my opinion. I also only ran full synthetic ATF in my cars...
I would run a higher stall converter for sure, I love the Vig 2800, they actually stall a little higher in our cars. Anytime I have an Auto Vette it will have this converter in it.
If you go with gears I would not go lower than a 3:15, it will just be too low geared for the car. GM now has a perf ratio for the A6, they use a 2:73 in place of the 2:56 for the perf option.
I had 2800 Vig in my last two Vettes and the temps were NEVER high or out of control except on a road course. For just strip use and around town even in our 110 plus degree heat in the summer my tranny would never run hot.Now on the road course now thats a diff story. A tranny cooler is a good idea and is not too hard to install or very expensive so it is a good idea just not absolutely needed in my opinion. I also only ran full synthetic ATF in my cars...
I would run a higher stall converter for sure, I love the Vig 2800, they actually stall a little higher in our cars. Anytime I have an Auto Vette it will have this converter in it.
If you go with gears I would not go lower than a 3:15, it will just be too low geared for the car. GM now has a perf ratio for the A6, they use a 2:73 in place of the 2:56 for the perf option.
Last edited by Pontiaker; Dec 9, 2007 at 03:34 AM.
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
NO, hi Dennis!
I had 2800 Vig in my last two Vettes and the temps were NEVER high or out of control except on a road course. For just strip use and around town even in our 110 plus degree heat in the summer my tranny would never run hot.Now on the road course now thats a diff story. A tranny cooler is a good idea and is not too hard to install or very expensive so it is a good idea just not absolutely needed in my opinion. I also only ran full synthetic ATF in my cars...
I would run a higher stall converter for sure, I love the Vig 2800, they actually stall a little higher in our cars. Anytime I have an Auto Vette it will have this converter in it.
If you go with gears I would not go lower than a 3:15, it will just be too low geared for the car. GM now has a perf ratio for the A6, they use a 2:73 in place of the 2:56 for the perf option.
I had 2800 Vig in my last two Vettes and the temps were NEVER high or out of control except on a road course. For just strip use and around town even in our 110 plus degree heat in the summer my tranny would never run hot.Now on the road course now thats a diff story. A tranny cooler is a good idea and is not too hard to install or very expensive so it is a good idea just not absolutely needed in my opinion. I also only ran full synthetic ATF in my cars...
I would run a higher stall converter for sure, I love the Vig 2800, they actually stall a little higher in our cars. Anytime I have an Auto Vette it will have this converter in it.
If you go with gears I would not go lower than a 3:15, it will just be too low geared for the car. GM now has a perf ratio for the A6, they use a 2:73 in place of the 2:56 for the perf option.
Drifting
Joined: Nov 2004
Posts: 1,753
Likes: 2
From: Fresno CA
hi Matt, you are probably right but i have a 3800 and advised Tony to get the biggest converter he can, and i drive like i am on a road course. around town its fine but passing in and out flooring jack rabbit starts i was reaching 235 if i drove normal stayed in my lane 70 mph it would come to 200. after cooler driving normal 200 then driving like the rest at 70 in my lane 165
Mine never goes over 225, and I very rarely see that. Is that temp with the cooler on it?
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Race Director
Joined: Mar 2005
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From: Southampton NJ
also i think it because of the gears to because the trans is spinning faster
Drifting
Joined: Nov 2004
Posts: 1,753
Likes: 2
From: Fresno CA
Normal range for my car before and after the converter install is 205-215. This is the second car I used the same converter on and paid close attention to tranny temps on both cars. There was no real change except on the road course...Even in hot summer weather.
Thread Starter
Safety Car
Joined: Sep 2006
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From: Cheektowaga NY
St. Jude Donor '08
I found out that if i wanted to go to 3.15 gears you have to replace to a 3 series case since i have a 2 series case(2.56). But what about the 2.92`s? Can you just change the ring and pinion? I am thinking that it would be alot cheaper, than to replace the whole thing(3.15). Would there be much of a difference between the 3.15 and 2.92`s with say a 2800 stall converter?
Last edited by Tony B4; Dec 26, 2007 at 12:28 PM.
Collections Hold
Joined: Aug 2002
Posts: 2,899
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From: Fort Wayne Indiana
I found out that if i wanted to go to 3.15 gears you have to replace to a 3 series case since i have a 2 series case(2.56). But what about the 2.92`s? Can you just change the ring and pinion? I am thinking that it would be alot cheaper, than to replace the whole thing(3.15). Would there be much of a difference between the 3.15 and 2.92`s with say a 2800 stall converter?
If you'd like dead-accurate, no B.S. answers on what works and what doesn't from the company that first pioneered a lot of this stuff others have copied, give us a call directly after the Holidays here and we'll set the record straight for you.
Been there...done that lonngggg ago.
Last edited by DTE Powertrain; Dec 26, 2007 at 03:15 PM.
Thread Starter
Safety Car
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From: Cheektowaga NY
St. Jude Donor '08
Whom ever told you that false, inaccurate information is flat wrong on all accounts.... We build 2.56, 2.93, 3.15 and 3.42 A6 differentials weekly around here on 2-series differentials (as we have for the C5 platform for years)- all without one negative issue to date with either stregth or durability in any capacity what-so-ever, despite folks consistantly telling us "it won't work". We build these in two different fashions, depending on the application.
If you'd like dead-accurate, no B.S. answers on what works and what doesn't from the company that first pioneered a lot of this stuff others have copied, give us a call directly after the Holidays here and we'll set the record straight for you.
Been there...done that lonngggg ago.
If you'd like dead-accurate, no B.S. answers on what works and what doesn't from the company that first pioneered a lot of this stuff others have copied, give us a call directly after the Holidays here and we'll set the record straight for you.
Been there...done that lonngggg ago.
Pro
Joined: Feb 2007
Posts: 609
Likes: 2
From: Cranford NJ
I found out that if i wanted to go to 3.15 gears you have to replace to a 3 series case since i have a 2 series case(2.56). But what about the 2.92`s? Can you just change the ring and pinion? I am thinking that it would be alot cheaper, than to replace the whole thing(3.15). Would there be much of a difference between the 3.15 and 2.92`s with say a 2800 stall converter?
It’s the posi unit that needs to be changed from a 2 series to a 3 series, not the housing.
We also find it necessary to change other internal components, so that we can get the proper wear pattern. It is true that some shops will install a 3 series gear on a 2 series posi unit with the use of a spacer.
When doing so, the ring gear is not being held to the posi unit properly, which we have seen fail prematurely.
Rather then installing something that may fail, we will only install a 3 series posi unit to ensure its strength and reliability.
Julian C Hormilla
(908) 317-4496
Safety Car
Joined: Nov 2007
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From: Bethesda MD
2.93s sound good and will be a good improvement over the 2.56s, but I'd stay with the 3.15s if you leave the stock converter in. With a 3000 stall, both will do fine. I'd bet the 3.15s ET difference would be .02 - .05 assuming you hook up the 3.15s.
Tech Contributor
Joined: Jul 2002
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From: St. Louis, MO
St. Jude Donor '08
Dont fear the gear! I went from 2.73 to 3.27 in my 91 Mustang GT 15 years ago and it was a mistake. Not enough difference for the money spent. I was warned at the time but I didn't believe them. Believe me, don't make the same mistake. Although at $300 for the gear change at the Ford Dealer 
(to keep warranty intact) it wasn't a lot of money compared to a C6 rear!
Race Director
Joined: Mar 2005
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From: Southampton NJ
Dont fear the gear! I went from 2.73 to 3.27 in my 91 Mustang GT 15 years ago and it was a mistake. Not enough difference for the money spent. I was warned at the time but I didn't believe them. Believe me, don't make the same mistake. Although at $300 for the gear change at the Ford Dealer (to keep warranty intact) it wasn't a lot of money compared to a C6 rear! go with the 342
Thread Starter
Safety Car
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From: Cheektowaga NY
St. Jude Donor '08
Julian, Thanks for the info. This is all new to me and i appreciate the help.
Ragtop 99,sounds like 3.15`s are the way to go.
Joe G, thats my problem, i am fearing the gear.
Dennis, I new that you would say that.
This is all new to me and i appreciate the help. Ragtop 99,sounds like 3.15`s are the way to go.
Joe G, thats my problem, i am fearing the gear.
Dennis, I new that you would say that.
Last edited by Tony B4; Dec 26, 2007 at 06:17 PM.