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08-19-2009, 02:15 PM
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#1
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11 Second Club
Join Date: Feb 2008
Location: Edison, NJ
Posts: 4,620
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Gears and rears
So, I am looking to upgrade the rear in my car...
What should I do as far as gearing goes?
Milage on the highway doenst bother me., too much if at all
Currently har has 3.73's and does fine.
Car has a 3500 stall and currently on a 26" tall tire, would a 4.10 gear be too much where I am hitting the limiter at the track, or I would be going into 4th gear? 6400 rev limitter
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1999 Z28 Convertible. 6 speed swap, wide cowl hood, full hockey stripes, and a whining 10 bolt.
2008 Sierra Vortec Max. 6.2 swapped, headers, Magnaflow catback, GMPP CAI, NHT optioned tow package.
2006 GTO, 11.48 @ 118.3
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08-19-2009, 07:42 PM
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#2
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Co-Founder / Site Admin
Join Date: Jul 2004
Location: Ewing, NJ
Posts: 22,476
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You are looking at 121mph in 3rd gear (A4 car, right?) with the 4.10s. Also, you would be turning 2800 RPM @ 75mph in overdrive.
The current 3.73s would allow you to run to 133mph in 3rd gear.
This is assuming a radial tire. If you're running a bias ply you can assume some growth, and you'll have a few more mph to play with on the top end.
- Justin
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1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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08-19-2009, 08:35 PM
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#3
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11 Second Club / I <3 LT1s
Join Date: May 2008
Location: Troy, Mi
Posts: 2,642
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Quote:
Originally Posted by Tru2Chevy
You are looking at 121mph in 3rd gear (A4 car, right?) with the 4.10s. Also, you would be turning 2800 RPM @ 75mph in overdrive.
The current 3.73s would allow you to run to 133mph in 3rd gear.
This is assuming a radial tire. If you're running a bias ply you can assume some growth, and you'll have a few more mph to play with on the top end.
- Justin
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did you factor in converter slip?
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Vinnie -
00 SS A4- LQ9/LS3/Stalled/3.42s 1.48/11.10/121 mph<-6spd swap in progress.
13 Silverado Z71- Sold 11/16
99 Z28 M6- -H/C/9in - sold 1/13
99 Silverado Z71- The DD - Sold 7/13
03 CBR 600RR - Sold 8/13
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08-20-2009, 01:08 AM
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#4
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11 Second Club
Join Date: Feb 2008
Location: Edison, NJ
Posts: 4,620
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Yes, an auto car... its a 3500 stall currently...
Or would I be better suited going to a gear such as 3.90?
__________________
1999 Z28 Convertible. 6 speed swap, wide cowl hood, full hockey stripes, and a whining 10 bolt.
2008 Sierra Vortec Max. 6.2 swapped, headers, Magnaflow catback, GMPP CAI, NHT optioned tow package.
2006 GTO, 11.48 @ 118.3
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08-20-2009, 02:51 AM
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#5
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NJFBOA Supporting Sponsor
Join Date: Feb 2006
Location: HULMEVILLE, PA
Posts: 2,023
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I would stay with 3.73 if you are planning to keep running the 26" tire
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JSSPEEDANDCUSTOM.COM
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08-20-2009, 07:55 AM
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#6
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11 Second Club
Join Date: Feb 2008
Location: Edison, NJ
Posts: 4,620
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What might I gain from going to a 28" tire and 4.11 gears?
__________________
1999 Z28 Convertible. 6 speed swap, wide cowl hood, full hockey stripes, and a whining 10 bolt.
2008 Sierra Vortec Max. 6.2 swapped, headers, Magnaflow catback, GMPP CAI, NHT optioned tow package.
2006 GTO, 11.48 @ 118.3
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08-20-2009, 09:07 AM
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#7
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NJFBOA Supporting Sponsor
Join Date: Feb 2006
Location: HULMEVILLE, PA
Posts: 2,023
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Even if you went with 28" tires I still dont think I would use a 4.11. Maybe more like a 3.90.
You would gain traction going to a bigger tire.
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JSSPEEDANDCUSTOM.COM
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