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10-17-2007, 08:28 AM
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CC Member
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Join Date: Apr 2006
Location: Round Rock,
TX
Cobra Make, Engine: LSC427, 351W, TKO500, Currie 9", 400HP
Posts: 103
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Not Ranked
Gear Ratio Help
Hey Guys! I need a little help. I am trying to figure out what is the best gear setup for my rear end and was hoping to see what others are running. Currently, I have 351 Windsor, 4.11's, and a TKO500 with overdrive and at 70 MPH I am sitting at about 3500RPM.  I want to reduce the RPM's down to 2400 at 70. Any suggestions or maybe I could get so of your current setups to compare to. I would appreciate any help. Thanks!
__________________
Ya cant take it with you.
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10-17-2007, 08:41 AM
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CC Member
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Join Date: Dec 2004
Location: Kansas City,
KS
Cobra Make, Engine: jbl
Posts: 2,291
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Not Ranked
i have a 3.73 rear with similiar setup and turn 3000rpm at a little less than 70mph, give you an idea.
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10-17-2007, 08:45 AM
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CC Member / Sponsor
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Join Date: Jan 2002
Location: Provo,
UT
Cobra Make, Engine: Daytona Coupe
Posts: 1,356
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Not Ranked
2,400/3,500*4.11=2.82
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10-17-2007, 08:46 AM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
A Gear Near 3.23 Will Put You Where You Want To Be.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
Last edited by Rick Parker; 10-17-2007 at 09:07 AM..
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10-17-2007, 08:53 AM
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CC Member / Sponsor
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Join Date: Jan 2002
Location: Provo,
UT
Cobra Make, Engine: Daytona Coupe
Posts: 1,356
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Not Ranked
(Old RPM)*(New Gear ratio/Old Gear ratio)=New RPM
So to take Rick suggestion you would get:
3,500*(3.23/4.11)=2,750 RPM
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10-17-2007, 10:45 AM
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CC Member
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Join Date: Mar 2006
Location: Buffalo,
NY
Cobra Make, Engine: Classic Roadster SC
Posts: 92
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Not Ranked
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10-17-2007, 10:49 AM
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Beam Me Up Scottie
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Join Date: Aug 2004
Location: Squantum (part of Quincy),
MA
Cobra Make, Engine: SPF1049 Titanium w/black stripes, 351W with Trick Flow Heads, Tremec 3550
Posts: 7,592
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Not Ranked
__________________
Warren
'Liberals are maggots upon the life of this planet and need to get off at the next rotation.' (Jamo 2008)
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10-17-2007, 04:29 PM
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CC Member
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Join Date: Sep 2002
Location: Round Rock, TX,
Posts: 167
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Not Ranked
I have 3.08's and turn about 2200 at 70. (302 with a T5 from a 92 GT)
James
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10-17-2007, 07:21 PM
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Senior Club Cobra Member
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Join Date: Dec 2001
Location: Glendale,
AZ.
Cobra Make, Engine: Cobray-C3, The 60's body lines on todays chassis technology
Posts: 2,302
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Not Ranked
Greg,
You did not tell us what if ANYTHING you would be willing to give up sp you can be reading 2.4K on the tac. With the more is better additude of this group why not just go with MORE !!!!!
You have a sweat car now and the engine would pull most any gear combo you could dream of but this is a plug n play for my cars. Check with the tranny gods but I think you would simply love it !!!!!!!
Model1st2nd3rd4th5th6thHPTorque
Rating DescriptionTKO-5003.271.981.341.00.68n/a550500 ft/lbs. *(Wide ratio & Street OD) TKO-6002.871.891.281.00.64n/a650600 ft/lbs.*(Close ratio & Street OD)TKO-600 (RR)2.871.891.281.00.82n/a650600 ft/lbs.*(Close ratio & Road Race OD)T56-00112.972.071.431.00.80.62475400 ft/lbs.(6-Speed)T56-Viper2.661.781.301.00.74.50650600 ft/lbs.(6-Speed)
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10-18-2007, 07:16 AM
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CC Member
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Join Date: Apr 2006
Location: Round Rock,
TX
Cobra Make, Engine: LSC427, 351W, TKO500, Currie 9", 400HP
Posts: 103
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Not Ranked
Thanks Guys!  Looking for the best setup before I go drop the cash.
__________________
Ya cant take it with you.
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