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06-05-2011, 01:37 PM
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CC Member
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Join Date: Dec 2010
Location: Tempe,AZ-High Point,NC,
AZ
Cobra Make, Engine: Kirkham #684, 482FE, Mike Mccluskey build
Posts: 2,520
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Not Ranked
427w rear gears
What rear gears are you guys running with the 427w small block, assuming you have a 5 speed, i've heard everything from 4:10 to 3:27, thanks for any help.
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PRIDEnJOY
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06-05-2011, 03:16 PM
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CC Member
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Join Date: Apr 2006
Location: Los Angeles,
ca
Cobra Make, Engine: Hurricane Motorsports, 427w
Posts: 437
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Not Ranked
I'm running 3.73 with a .82 5th gear ratio. I'm taching about 3k rpms at 80 mph.
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Hurricane Motorsports #1053; 427w
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06-05-2011, 04:06 PM
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CC Member
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Join Date: Dec 2010
Location: Tempe,AZ-High Point,NC,
AZ
Cobra Make, Engine: Kirkham #684, 482FE, Mike Mccluskey build
Posts: 2,520
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Not Ranked
thanks, any info helps
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PRIDEnJOY
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06-05-2011, 05:23 PM
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CC Member
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Join Date: Oct 2003
Location: Bainbridge Island,
WA
Cobra Make, Engine:
Posts: 709
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Not Ranked
Guess it all depends on what you are planning to do with the car. Race? Cruise? Long trips? In any case I'd venture to guess that most guys here have 5 speed trannies with an overdrive 5th gear. My SPF has 3.73:1 gears and a .64 OD with a 418W. At 70 mph I tach 2100 rpm...very liveable. Running 3000 rpm on the freeway at 65-75 can get old real fast. If I were to do it all over I'd keep my Tremec TKO 600 but opt for the .82 5th gear and a 3.27 rear gear. I've had my car on some very long road trips over the years and driving at 65-75 and loping along at 1800-2200 rpm is very liveable.
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06-05-2011, 05:39 PM
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CC Member
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Join Date: Feb 2005
Location: Perrysburg,
OH
Cobra Make, Engine: SPF #298 427 FI
Posts: 497
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Not Ranked
Just switched to a 3.73 from a 3.27. Not sure what my fith is but 70mph is about 2300-2500. Im glad i switched but didnt notice as much difference as I thought i would. I would go at least 3.73.
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06-05-2011, 05:55 PM
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CC Member
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Join Date: Mar 2006
Location: El Paso,
tx
Cobra Make, Engine: FRR MKIII 408w
Posts: 340
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Not Ranked
408w 530 hp 535 f/t. 3:27 TKO 500, 1st is usealbe, 70 mph in 5th is1,900-2000 PRM. very streetalble..... I can use 5th at 1,500RPM and she PULLS!!!!
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06-05-2011, 06:06 PM
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CC Member
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Join Date: Sep 2009
Location: Camarillo,
CA
Cobra Make, Engine: SPF #2608, Roush 427SR T-W
Posts: 911
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Not Ranked
In SPF 2608 made in 2007 I have the Dana rear end with the 3.46 rear end, 0.82 OD and 17" wheels. At 70 MPH in 5th the Dart 427 is turning over at 2,545. Of course 5th gear has plenty of reserve power for acceleration. With my limited experience, I'm very happy with the rear end ratio when starting off in 1st.
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06-05-2011, 06:54 PM
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CC Member
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Join Date: Dec 2010
Location: Tempe,AZ-High Point,NC,
AZ
Cobra Make, Engine: Kirkham #684, 482FE, Mike Mccluskey build
Posts: 2,520
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Not Ranked
thanks, i was going to try a 4:10, i think it would be a mean street rear gear.
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PRIDEnJOY
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06-05-2011, 06:55 PM
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CC Member
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Join Date: Dec 2007
Location: Earlimart,
Ca
Cobra Make, Engine: Superformance 2765 Roush 427(POS) with cruise.
Posts: 221
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Not Ranked
3.46 rear, .82 od, 15", 70mph 2500. 209
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06-05-2011, 07:32 PM
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Senior Club Cobra Member
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Join Date: Nov 2003
Location: Parker County,
Tx
Cobra Make, Engine: LoneStar LS427 , 427 Windsor
Posts: 381
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Not Ranked
It will depend upon your rear tire diameter and 1st gear ratio, but while a 4.10 might be great for your high-winding cammer, the windsor will have TORQUE. With short tires on 17" wheels and a 4.10 rear gear, 1st gear will be useless for anything but parades and testing your rev limiter. You'll find yourself starting off in 2nd.
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Jim
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A Gnat! Quick, get a sledgehammer!
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06-05-2011, 08:14 PM
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CC Member
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Join Date: Dec 2010
Location: Tempe,AZ-High Point,NC,
AZ
Cobra Make, Engine: Kirkham #684, 482FE, Mike Mccluskey build
Posts: 2,520
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Not Ranked
thats what i figured, ive just had so many people with the 427w tell me so many different gear ratios for the street
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PRIDEnJOY
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06-05-2011, 08:20 PM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,430
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Not Ranked
There is no perfect gear for every situation. Unless the car is dedicated to a specific purpose, it's always going to be a comprimise. Some people like more, and some less. Some people cruise at 80, and some at 60.
When I'm on tthe highway cruising at 80, I think a 3.27 or 3.08 would be perfect. But when I'm on the back roads, a 3.55 ro 3.73 would be better. I find that a 3.55 seems to fit most of my driving situations pretty well.
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.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
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06-06-2011, 03:11 AM
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CC Member
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Join Date: Aug 2009
Location: Adelaide,
SA
Cobra Make, Engine: AP 289FIA 'English' spec.
Posts: 13,139
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Not Ranked
Have you looked at these Superformance pages:
Second Strike Gearing Calculator
http://www.secondstrike.com/Technical/GearingHelp.pdf
The second one in particular is well worth a read. Page four describes the desirability of not overpowering the tyres too much in second gear (ie not having the diff. ratio too short).
Cheers,
Glen
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06-06-2011, 07:11 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
with the larger rear gears you shift through the gears so quick just driving around with the light wt. cobra and all the power. i don't have that much engine but do have a 3.73 in one and a 3.55 in the other, wouldn't go larger then 3.73 and could use a 3.55 or thereabouts real easy all day long. with a 3.73 or 3.55 you can accelerate in 2nd and skip shift to 4th pretty easy for street driving fyi.
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