C6 A4 vs A6
Racer
Joined: Sep 2007
Posts: 333
Likes: 27
From: East Coast
Trans ratios
Try this, A4 I believe came with 2.73 from factory with 3.15 optional.
A6 came with 2.56 and 2.73 optional
http://mysite.verizon.net/foofoo2/c6/
A6 came with 2.56 and 2.73 optional
http://mysite.verizon.net/foofoo2/c6/
Thread Starter
Intermediate
Joined: Nov 2008
Posts: 29
Likes: 0
From: Port Arthur Texas
That's a cool site, great information.
I'm trying to figure out how much I'm missing. I decided to get an '05 when I could have got an '06, thinking the only thing I'd be missing, was the thumb shifters.
But I got to thinking, what was the reasoning behind going to a 6 speed automatic. Was it to improve gas mileage? Or was it to improve acceleration? was it a combination?
Would it be worth it for me to transplant an A6 into my car?
I'm trying to figure out how much I'm missing. I decided to get an '05 when I could have got an '06, thinking the only thing I'd be missing, was the thumb shifters.
But I got to thinking, what was the reasoning behind going to a 6 speed automatic. Was it to improve gas mileage? Or was it to improve acceleration? was it a combination?
Would it be worth it for me to transplant an A6 into my car?
Team Owner
Joined: Feb 2001
Posts: 27,254
Likes: 136
From: Short Hills, NJ
No.
Would not be worth it at all, the A4/4L65 is still a great automatic and certainly gets the job done very well.
Racer
Joined: Sep 2007
Posts: 333
Likes: 27
From: East Coast
thunderkyss:
I'm not sure, but I believe the only difference between an A4 and an A6 (beside the extra gears) is the final drive is .70 in an A4 and .67 in an
A6. I don't know how feasible it would be to "transplant" one drive train into the other. I think there is a difference in not only the trans computers but also the BCM and the ECM, to say nothing of the associated wiring and controls, possibly even the torque tube. My 06 has the A6 trans and after having the trans tuned, I love it. I also modded the paddles to put upshift on the right side and downshift on the left side, seems more natural to me.
I'm not sure, but I believe the only difference between an A4 and an A6 (beside the extra gears) is the final drive is .70 in an A4 and .67 in an
A6. I don't know how feasible it would be to "transplant" one drive train into the other. I think there is a difference in not only the trans computers but also the BCM and the ECM, to say nothing of the associated wiring and controls, possibly even the torque tube. My 06 has the A6 trans and after having the trans tuned, I love it. I also modded the paddles to put upshift on the right side and downshift on the left side, seems more natural to me.
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
The really good thing about the A6 is it has very short gears for the first 4 gears and then overdrive for the last 2. It has a 1.53 third gear as compared to a 1.00 third gear in the A4. So the rearend ratios are very misleading for the A6. The 2.56 rearend with the A6 is the same as an A4 with a 3.92 rearend. So acceleration is fantastic. Then with the 6th gear, it's the same as the M6, you can cruise at 70 mph at 1500 rpm and get great mileage. Chevy really got this one right, it's like having your cake and eating it too!
Melting Slicks
Joined: Mar 2008
Posts: 2,835
Likes: 5
From: Avon Park FLORIDA
St. Jude Donor '08-'09-'10
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Intermediate
Joined: Nov 2008
Posts: 29
Likes: 0
From: Port Arthur Texas
The really good thing about the A6 is it has very short gears for the first 4 gears and then overdrive for the last 2. It has a 1.53 third gear as compared to a 1.00 third gear in the A4. So the rearend ratios are very misleading for the A6. The 2.56 rearend with the A6 is the same as an A4 with a 3.92 rearend. So acceleration is fantastic. Then with the 6th gear, it's the same as the M6, you can cruise at 70 mph at 1500 rpm and get great mileage. Chevy really got this one right, it's like having your cake and eating it too!
Thanks.
Team Owner
Joined: Feb 2001
Posts: 27,254
Likes: 136
From: Short Hills, NJ
Team Owner
Joined: Nov 2006
Posts: 21,136
Likes: 212
From: Long Island New York
The really good thing about the A6 is it has very short gears for the first 4 gears and then overdrive for the last 2. It has a 1.53 third gear as compared to a 1.00 third gear in the A4. So the rearend ratios are very misleading for the A6. The 2.56 rearend with the A6 is the same as an A4 with a 3.92 rearend. So acceleration is fantastic. Then with the 6th gear, it's the same as the M6, you can cruise at 70 mph at 1500 rpm and get great mileage. Chevy really got this one right, it's like having your cake and eating it too!
I dont feel undergunned at all with mine. In fact it gets out of the hole right quick!
Team Owner
Joined: May 2004
Posts: 82,175
Likes: 1,319
From: McKinney TX
St. Jude Donor '21-'22-'23-'24
------------Z06---Std 6-spd---Z51 6-spd--6-spd Auto---4-spd Auto
--1st-------2.66----2.66--------2.97-------4.03---------3.06
--2nd-------1.78----1.78--------2.07-------2.36---------1.63
--3rd-------1.30----1.30--------1.43-------1.53---------1.00
--4th-------1.00----1.00--------1.00-------1.15---------0.70
--5th-------0.74----0.74--------0.71-------0.85
--6th-------0.50----0.50--------0.57-------0.67
Rev---------2.90----2.90--------3.28-------3.06---------2.29
Axle Ratio--3.42----3.42--------3.42----2.56(or 2.73)--2.73(or 3.15)
Gear Ratio times Rear Axle Ratio
--GEAR------Mode--or--Option
------------Z06---Std 6-spd---Z51 6-spd----6-spd Auto-------4-spd Auto
--1st-------9.10----9.10-------10.16-----10.32 or 11.00----8.35 or 9.64
--2nd-------6.09----6.09--------7.08------6.04 or 6.44-----4.45 or 5.13
--3rd-------4.45----4.45--------4.89------3.92 or 4.18-----2.73 or 3.15
--4th-------3.42----3.42--------3.42------2.94 or 3.14-----1.91 or 2.21
--5th-------2.53----2.53--------2.43------2.18 or 2.32
--6th-------1.71----1.71--------1.95------1.72 or 1.83
Rev---------9.92----9.92-------11.22------7.83 or 8.35-----6.25 or 7.21
