Does anyone have a 3:73 automatic
Thread Starter
6th Gear
Joined: May 2005
Posts: 6
Likes: 0
Does anyone have a 3:73 automatic
I have a 2004 heavily modified corvette coupe with 400 rear wheel hp.
I currently have a 3:42 rear end. Best ET is 12.005. I am considering
installing a 3:73. Does anyone have any experience with this? What would my RPM's be if I were driving at 70 MPH? Any comments or suggestions appreciated. My goal is 11.7 to 11.8. Thanks
I currently have a 3:42 rear end. Best ET is 12.005. I am considering
installing a 3:73. Does anyone have any experience with this? What would my RPM's be if I were driving at 70 MPH? Any comments or suggestions appreciated. My goal is 11.7 to 11.8. Thanks
Le Mans Master
Joined: Dec 2003
Posts: 5,622
Likes: 0
From: Savannah Georgia
Cruise-In VIII Veteran
RPM's are about 2300 @ 70. can't help with your times
Also look up forum member Mike Mercury . He knows alot about gears ratio vs RPM's
Also look up forum member Mike Mercury . He knows alot about gears ratio vs RPM's
Last edited by navy99vert; May 25, 2005 at 09:32 PM.
Le Mans Master
Joined: Aug 2000
Posts: 5,294
Likes: 2
From: Suffolk, Long Island NY
I think you need to worroy about traction more than changing your gear ratio. For an A4 with 400rwhp, you should EASILY be in the 11's, if not 10's.
As for the 3.73's, they're the way to go for a street/strip A4.
As for the 3.73's, they're the way to go for a street/strip A4.
Last edited by Face; May 25, 2005 at 11:29 PM.
Le Mans Master
Joined: Mar 2005
Posts: 5,811
Likes: 31
From: Minnetonka MN
St. Jude Donor '06
i have 3.73 with an A4. at about 70mph, my rpms are around ~2500...
with 400rwhp, u should be in the mid to high 11's...
i have 470rwhp, im running 11 flat, could go lower with better lauches and better tires...
Aj
with 400rwhp, u should be in the mid to high 11's...
i have 470rwhp, im running 11 flat, could go lower with better lauches and better tires...
Aj
Advanced
Joined: Apr 2005
Posts: 99
Likes: 0
Originally Posted by Face
I think you need to worroy about traction more than changing your gear ratio. For an A4 with 400rwhp, you should EASILY be in the 11's, if not 10's.
As for the 3.73's, they're the way to go for a street/strip A4.
As for the 3.73's, they're the way to go for a street/strip A4.
Face is right you should already be in the 11s. One of my buddy's has run 11.55 @ 117 with just 370 RWHP (bolt on's cam only) he has an ST3500 & 3.42 gears in his A4. What stall & tires are you running?
I have 3.73s in my A4 and I am at 2350 RPM at 70 MPH.
Last edited by C5magic; May 26, 2005 at 12:10 PM.
Safety Car
Joined: Jun 2003
Posts: 4,640
Likes: 0
From: Sunshine State
Originally Posted by 16Again
3.73 gear with the A4. 2400rpm @ 70mph with an SS3600 TC. I have all the bolt-ons and have run a best of 11.96 
Bob
Bob
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
Racer
Joined: Jun 2004
Posts: 433
Likes: 0
From: Brookfield WI
Here is something from Mike Mercury's website that might be helpful.
http://mikemercury.home.att.net/ratio.htm
http://mikemercury.home.att.net/ratio.htm
