3.55 vs 3.73 S.C. GT

Eagle2000GT · February 20th, 2010, 12:30 PM

Cobras can get away with a lower gear because their redline is higher. I don't think it would be wise to intentionally push my motor to 6500-7000 rpm.

(I have unintentionally gone to 6500 a couple of times.

Nothing happened though.)

drazga97 · February 20th, 2010, 12:47 PM

Originally Posted by GTRACER88

Personal opinion. Everyone is entitled to one. A buddy of mine has a 680 rwhp cobra has a kenne bell on it, and he has 4:10s and will not change them.

how tall is his tire though.

Shaun03GT · February 20th, 2010, 12:50 PM

I wont do 4.10's because there not as enjoyable imo. Espeically for a supercharger. I wanna fell that thing pull. 4.10's rip through and it wont be that fun. Plus at 6000rpm, on the stock size tire, the top of 4th is 111mph. For track purposes, and highway purposes....that sucks.

The differance between 3.55 and 3.73s at the top of 4th is like 7mph. That, I dont care about. Although 6000 in 4th with 3.55s is like 130mph which would be nice.

limited · February 20th, 2010, 01:07 PM

I can't imagine having 4:10's, with 3:73's there are times I fight for traction in 3rd which can be pretty scary breaking loose at 40-45 and car going sideways. Centri guys seem to enjoy 4:10's more but with stock tire size,dd with hiway 3:73's would be my choice.

Shaun03GT · February 20th, 2010, 01:09 PM

Originally Posted by limited

I can't imagine having 4:10's, with 3:73's there are times I fight for traction in 3rd which can be pretty scary breaking loose at 40-45 and car going sideways. Centri guys seem to enjoy 4:10's more but with stock tire size,dd with hiway 3:73's would be my choice.

Thats what I mean...shit I have hard time getting traction grabbing 2nd with 4.10's. Nevermind with boost. Ill probally go 3.73's so I can enjoy the pulls in every gear, and got be in boost on the highway. Cause I always drive at like 80-90mph when traffic is low.

JayC · February 20th, 2010, 01:14 PM

Originally Posted by Shaun03GT

Thats what I mean...shit I have hard time getting traction grabbing 2nd with 4.10's. Nevermind with boost. Ill probally go 3.73's so I can enjoy the pulls in every gear, and got be in boost on the highway. Cause I always drive at like 80-90mph when traffic is low.

Why not just put a throttle stop on the car. Much easier than making the car hook. Your car will be quicker with 4.10's but you have your mind made up

jivepepper · February 21st, 2010, 12:45 AM

Gears depend on what transmission, power, and if you plan on racing the 1/8 or the 1/4.

When I was only reving to 6400 and making a little over 500 I would ocasionally hit the rev limiter with 3.73's going through the traps in the high 120's, 4:10s would've been to steep. Now that I rev to 7k It might be ok.

Shaun03GT · February 21st, 2010, 12:48 AM

Yea true..Im running 1/4 all the time. I definatley dont want 4.10's. I will for a week or 2, untill I have the money to get the 3.73's or 3.55's installed. But to be honest, Im leaning towards 3.73's. Itll give me like 122mph at 6k in 4th on stock size tires. And by the time Im hitting 122mph trap, Ill have a built motor that revs to 7k.

86er · February 21st, 2010, 01:09 AM

on the turbo and blower cars we always run 3.55 gears, let car run longer through 3rd gear and take advantage of it.

works good enough for 5.7x's-6.4x's eight mile cars

February 20th, 2010, 12:30 PM	#21
Eagle2000GT I Post Entirely Way Too Much 2000 Mustang GT 12.73@111.36 Join Date: Aug 2007 Location: Shelbyville, IN Posts: 5,311 iTrader: 1 reviews	Cobras can get away with a lower gear because their redline is higher. I don't think it would be wise to intentionally push my motor to 6500-7000 rpm. (I have unintentionally gone to 6500 a couple of times. Nothing happened though.) __________________ ProCharger P-1SC, 9 psi, STD 396/383; Uncorrected 388/375; SAE 383/370 Mods list in Garage.

February 20th, 2010, 12:50 PM	#23
Shaun03GT I Post Entirely Way Too Much 2003 Mustang GT 1/8 - 7.92 @ 91.13mph 1/4 - 12.21 @ 115.84mph Join Date: Sep 2009 Location: Weymouth, MA Posts: 13,442 iTrader: 12 reviews	I wont do 4.10's because there not as enjoyable imo. Espeically for a supercharger. I wanna fell that thing pull. 4.10's rip through and it wont be that fun. Plus at 6000rpm, on the stock size tire, the top of 4th is 111mph. For track purposes, and highway purposes....that sucks. The differance between 3.55 and 3.73s at the top of 4th is like 7mph. That, I dont care about. Although 6000 in 4th with 3.55s is like 130mph which would be nice. __________________ Vortech V1 Intercooled @ 11psi 394rwhp/392rwtq @ 9.5psi 415rwhp/400rwtq @ 11psi on Methanol Tuned By: Pete @ Performance Dyno Affordable Supercharger Build Guide Supercharger Info for Noobs

February 20th, 2010, 01:07 PM	#24
limited Premium Member 99 limited edition vert Join Date: Mar 2007 Location: Tacoma,Washington Posts: 3,297 iTrader: 0 reviews	I can't imagine having 4:10's, with 3:73's there are times I fight for traction in 3rd which can be pretty scary breaking loose at 40-45 and car going sideways. Centri guys seem to enjoy 4:10's more but with stock tire size,dd with hiway 3:73's would be my choice. __________________ KB'd 446rwhp/451rwtq, Mustang Dyno http://www.youtube.com/watch?v=3ZDpQ0EEm1M Tuned by Joe at http://www.tricktuners.com

February 21st, 2010, 12:45 AM	#27
jivepepper I Post Entirely Way Too Much Join Date: Mar 2006 Location: Under a sombrero Posts: 5,025 iTrader: 1 reviews	Gears depend on what transmission, power, and if you plan on racing the 1/8 or the 1/4. When I was only reving to 6400 and making a little over 500 I would ocasionally hit the rev limiter with 3.73's going through the traps in the high 120's, 4:10s would've been to steep. Now that I rev to 7k It might be ok. __________________ 665/541 WHP/WTQ 4.6L SOHC 2V ON 93 OCTANE PUMP GAS. NO METH INJ., NO E85, NO RACE GAS, N2O BABY BOTTLES! TRAP=POWER: 11.01 @135, IN SUMMER HEAT, 1350' TRACK, 315/35/17 DR'S Last edited by jivepepper; February 21st, 2010 at 01:01 AM.

February 21st, 2010, 12:48 AM	#28
Shaun03GT I Post Entirely Way Too Much 2003 Mustang GT 1/8 - 7.92 @ 91.13mph 1/4 - 12.21 @ 115.84mph Join Date: Sep 2009 Location: Weymouth, MA Posts: 13,442 iTrader: 12 reviews	Yea true..Im running 1/4 all the time. I definatley dont want 4.10's. I will for a week or 2, untill I have the money to get the 3.73's or 3.55's installed. But to be honest, Im leaning towards 3.73's. Itll give me like 122mph at 6k in 4th on stock size tires. And by the time Im hitting 122mph trap, Ill have a built motor that revs to 7k. __________________ Vortech V1 Intercooled @ 11psi 394rwhp/392rwtq @ 9.5psi 415rwhp/400rwtq @ 11psi on Methanol Tuned By: Pete @ Performance Dyno Affordable Supercharger Build Guide Supercharger Info for Noobs

February 21st, 2010, 01:09 AM	#29
86er I Post Entirely Way Too Much Join Date: Nov 2006 Location: Memphis, TN Posts: 7,626 iTrader: 0 reviews	on the turbo and blower cars we always run 3.55 gears, let car run longer through 3rd gear and take advantage of it. works good enough for 5.7x's-6.4x's eight mile cars __________________ Just a truck 5.4 3v: 264hp 317ft lbs rock stock The "search" button, its not just for porn piecing together the next project faster than your first sexual experience

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