Differential Matters
Thread Starter
Instructor
Joined: Nov 2008
Posts: 114
Likes: 0
Differential Matters
I have an 05 Vette 4spd auto. I failed to do my homework when I purchased the car. Now I am told the ONLY option I have is a 3:15 performance axel ratio diff. I wanted the 3:42 diff that comes with the manual trans car but I am told this won't work in the automatic car. Is there another differential that will bolt up like maybe the GTO or Cadillac? My current diff is the standard 2:73. If I went with the 3:15 will the difference outweigh expense?
Last edited by MR.G.; Jul 21, 2009 at 05:53 PM.
Pro
Joined: Oct 2008
Posts: 735
Likes: 3
From: New Harmony IN
St. Jude Donor '09
I may be wrong but I dont see any reason why the 3:42 would not work, with the A4 you may be turning a few more RPMs than you would like (depends on what your wanting to do with it) as opposed to the 3:15, mine is an 05 Z51 MN6 W/3:42 and turns 1500-1550 @ 60 MPH.
Pro
Joined: Apr 2005
Posts: 702
Likes: 82
From: Ronkonkoma NY
St. Jude Donor '08-'09
I have an 05 Vette 4spd auto. I failed to do my homework when I purchased the car. Now I am told the ONLY option I have is a 3:15 performance axel ratio diff. I wanted the 3:42 diff that comes with the manual trans car but I am told this won't work in the automatic car. Is there another differential that will bolt up like maybe the GTO or Cadillac? My current diff is the standard 2:73. If I went with the 3:15 will the difference outweigh expense?
Melting Slicks
Joined: Feb 2004
Posts: 3,307
Likes: 111
From: Tucson AZ
Your 05 differential is different than the 06-09.
Contact RPM transmissions.
http://www.rpmtransmissions.com/
1-800-406-1109
Contact RPM transmissions.
http://www.rpmtransmissions.com/
1-800-406-1109
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Pro
Joined: Apr 2005
Posts: 702
Likes: 82
From: Ronkonkoma NY
St. Jude Donor '08-'09
You're sort of right, a rear end swap is not a "cheap" fix. Mine cost $ $1795 with a hardened shaft. It was installed by a very reputable shop on Long Island. That price was very competitive and I doubt you'll get it done for much less anywhere else.. Like its been said before on this forum, "if you want to play you have to pay".. If not leave it stock and enjoy the car the way it is.
Safety Car
Joined: Nov 2007
Posts: 4,537
Likes: 1,403
From: Bethesda MD
nobody said it was cheap, but switching from 2.73s to 3.42s or higher gears will provide a nice performance bump off the line and from a roll. Gears or a high stall Torque converter are excellent mods for the A4 and neither effects emissions / state inspections.
