3.27 vs 3.73 vs 4.10 (Took A Couple Hrs 2 Complete... Enjoy)

04GTAMPA · August 5th, 2007, 11:22 PM

I have my 4th top out at 117mph, not recommended, but doable. Raised limiter and now with the cams and springs.... OMG, I see it coming.

Excellent write up, I will most likely look into swapping my 4.10 for 3.73... Getting up to 6800-7000 too fast and can't imagine when I start spraying again, which will be tomorrow.

TheBusher · August 6th, 2007, 03:58 PM

finaly03vert · November 19th, 2007, 10:48 AM

good to know someone did this first i started on it yesterday and got frustrated and quit thank u ur the man NERD FTW

Blackblurr_00GT · November 19th, 2007, 12:35 PM

Hey could you do it for a set of 3.55s with a t-45

gsjohnson · November 19th, 2007, 01:04 PM

Thanks for doing all those calcs. That's good information. I'm curious where 3.55s fall into it as well. I'll pay the 5 bucks...

hardhitter · November 19th, 2007, 07:03 PM

I have a stock 99 GT and at 80mph in 5th I'm at 2400 rpm. According to the chart I should be about 300 rpm lower. Is there something wrong with my car?

leebunnyz · November 19th, 2007, 07:06 PM

Originally Posted by hardhitter

I have a stock 99 GT and at 80mph in 5th I'm at 2400 rpm. According to the chart I should be about 300 rpm lower. Is there something wrong with my car?

no

gsjohnson · November 19th, 2007, 10:08 PM

Originally Posted by hardhitter

I have a stock 99 GT and at 80mph in 5th I'm at 2400 rpm. According to the chart I should be about 300 rpm lower. Is there something wrong with my car?

Tire and rim size may not be identical to what was used for the calculation. Different tire manufacturers sizes are not always identical. And then there is the speedo calibration issue. So, there are a few variables.

ujslost · November 19th, 2007, 10:26 PM

Im still curious as to WHY THE HELL ISNT THIS A STICKY?

00SlvrStang · November 20th, 2007, 02:16 PM

Originally Posted by hardhitter

I have a stock 99 GT and at 80mph in 5th I'm at 2400 rpm. According to the chart I should be about 300 rpm lower. Is there something wrong with my car?

you have a t-45, that chart is for the 3650.

TheBusher · November 20th, 2007, 02:25 PM

Originally Posted by 00SlvrStang

you have a t-45, that chart is for the 3650.

+1 The gear ratio in fifth for the T-45 is 0.67, for the T-3650 it's 0.62.

TheBusher · November 20th, 2007, 02:30 PM

If anyone has any special requests, just PM me your tanny, gears you want, and your tire size.

therat1989 · May 13th, 2010, 12:21 AM

I hate to bring up a really old thread but this info is useful and can provide insight to those deciding between gears.
On a side note I have seen a little over 4400rpm in 5th gear in my car. Does that mean I was traveling above 150 considering 5th gear at 4000rpm should be 150mph?

YouTube - Mustang GT 0-150mph

Shaun03GT · May 13th, 2010, 12:24 AM

Great write up man. Im gonna rep u

Shaun03GT · May 13th, 2010, 12:26 AM

Oh wow this thread is from aug of 2007...my bad

therat1989 · May 13th, 2010, 12:33 AM

Yeah I know it is old but such good info.

GTRACER88 · May 13th, 2010, 01:39 AM

This is such and old thread.. Suck for you though... there was a calculator in 2007... PaladinMicro

Eagle2000GT · May 13th, 2010, 09:22 AM

It's hard to do fifth gear comparisons. 4:10s with a T-3650 transmission show almost the same rpms in fifth at any given speed as 3.73s with a T-45 transmission. The T-3650 has a fifth gear ratio of .62:1. The T-45's is .67:1. I think four in an auto is the same as a T-45s fifth.

Edit: My 2000 GT at 75 mph is running 2530 rpms. (T-45 with 3.73s). A 2002 GT with 4.10s will be running at 2570 rpms. At 60 mph there is only a 30 rpm difference. My 2000 GT is slightly lower than 2000 rpms. The 2002 GT is slightly above. It's so close (1.5% difference) that both would claim to be running 2000 rpms at 60 mph.

99RioGT · May 13th, 2010, 09:40 AM

Originally Posted by Eagle2000GT

It's hard to do fifth gear comparisons. 4:10s with a T-3650 transmission show almost the same rpms in fifth at any given speed as 3.73s with a T-45 transmission. The T-3650 has a fifth gear ratio of .62:1. The T-45's is .67:1.

According to wikipedia, the T45 and 3650 have the same exact 5th gear ratio in 2v cars. It's the mach 1 (and cobra?) that had the lower .62 overdrive gearing in 5th. I assume that was to compensate a bit for the factory 3.55 rear.

From wikipedia

TR-3650 used in the 2001-2004 Ford Mustang GT

* 1st: 3.380:1
* 2nd: 2.000:1
* 3rd: 1.320:1
* 4th: 1.000:1
* 5th: 0.670:1 (used on 01-04 with 3.27:1 final drive)
* 5th: 0.620:1 (used in 03-04 with 3.55:1 final drive, Mach1)
* Rev: 3.380:1

Eagle2000GT · May 13th, 2010, 10:12 AM

I don't know. CliffyK is a tech guru and he uses .62:1 for his 2003 Mustang GT's T3650 (reference the Paladinmicro link above). I've also compared rpms with guys who have T-3650s and 4.10s. The results were what I wrote. Maybe someone else can shed some light on this.

August 5th, 2007, 11:22 PM	#41
04GTAMPA Hardcore Enthusiast 2001 Mustang SVT Cobra Join Date: Apr 2007 Location: Riverview, FL Posts: 2,751 iTrader: 1 reviews	I have my 4th top out at 117mph, not recommended, but doable. Raised limiter and now with the cams and springs.... OMG, I see it coming. Excellent write up, I will most likely look into swapping my 4.10 for 3.73... Getting up to 6800-7000 too fast and can't imagine when I start spraying again, which will be tomorrow. __________________ Slow, really slow Cobra. Wanna see? MM Cobra Club Member #81 "TAMPA BAY AREA CREW"

November 19th, 2007, 10:48 AM	#43
finaly03vert Regular 03 gt vert lights cant time it Join Date: Sep 2007 Location: Lincoln NE Posts: 296 iTrader: 0 reviews	good to know someone did this first i started on it yesterday and got frustrated and quit thank u ur the man NERD FTW __________________ NX EFI plate 250 jetcustom tune Eibach Pro-Kit Magnaflow cat back high flow cats, 3:55s, ported and polished heads, comp cams, forged pistons/ rods Curently building up 03 mach block w stage 3 port job. look for twins and more n2o

November 19th, 2007, 12:35 PM	#44
Blackblurr_00GT Regular Y2K GT 13.3@103 Join Date: Mar 2007 Location: Ada Oklahoma Posts: 380 iTrader: 0 reviews	Hey could you do it for a set of 3.55s with a t-45 __________________ Studies show that 92% of kids listen to rap. If you are one of the 8% who still listens to real music put this in your signature.

November 19th, 2007, 01:04 PM	#45
gsjohnson Enthusiast Join Date: Sep 2007 Location: Woodland Hills, CA Posts: 682 iTrader: 0 reviews	Thanks for doing all those calcs. That's good information. I'm curious where 3.55s fall into it as well. I'll pay the 5 bucks... __________________ 2004 Mustang GT The difference between a girlfriend and wife is about 50 pounds.

November 19th, 2007, 10:26 PM	#49
ujslost MM Fanatic Join Date: Mar 2007 Location: Albertville, AL Posts: 3,920 Blog Entries: 1 iTrader: 1 reviews	Im still curious as to WHY THE HELL ISNT THIS A STICKY? __________________ 1986 Mustang GT t-top time piece!

August 6th, 2007, 03:58 PM	#42
TheBusher Hardcore Enthusiast 2002 Chevrolet Impala ??? Join Date: Jul 2007 Location: Fort Collins, Colorado Posts: 2,242 iTrader: 0 reviews

November 19th, 2007, 07:03 PM	#46
hardhitter MM Fanatic 1999 Mustang GT Join Date: Nov 2007 Location: Houston, TX Posts: 3,610 iTrader: 1 reviews	I have a stock 99 GT and at 80mph in 5th I'm at 2400 rpm. According to the chart I should be about 300 rpm lower. Is there something wrong with my car?

November 20th, 2007, 02:30 PM	#52
TheBusher Hardcore Enthusiast 2002 Chevrolet Impala ??? Join Date: Jul 2007 Location: Fort Collins, Colorado Posts: 2,242 iTrader: 0 reviews	If anyone has any special requests, just PM me your tanny, gears you want, and your tire size.

May 13th, 2010, 12:24 AM	#54
Shaun03GT I Post Entirely Way Too Much 2003 Mustang GT 1/8 - 8.09 @ 91.39mph 1/4 - 12.35 @ 114.52mph Join Date: Sep 2009 Location: Weymouth, MA Posts: 12,058 iTrader: 11 reviews	Great write up man. Im gonna rep u __________________ 2003 Mustang GT Vortech V1 Intercooled SAE Corrected - 380rwhp & 380rwtq @ 9psi Uncorrected - 401rwhp & 400rwtq @ 9psi Tuned By: Pete @ Performance Dyno Affordable Supercharger Build Guide Supercharger Info for Noobs

May 13th, 2010, 12:26 AM	#55
Shaun03GT I Post Entirely Way Too Much 2003 Mustang GT 1/8 - 8.09 @ 91.39mph 1/4 - 12.35 @ 114.52mph Join Date: Sep 2009 Location: Weymouth, MA Posts: 12,058 iTrader: 11 reviews	Oh wow this thread is from aug of 2007...my bad __________________ 2003 Mustang GT Vortech V1 Intercooled SAE Corrected - 380rwhp & 380rwtq @ 9psi Uncorrected - 401rwhp & 400rwtq @ 9psi Tuned By: Pete @ Performance Dyno Affordable Supercharger Build Guide Supercharger Info for Noobs

May 13th, 2010, 12:33 AM	#56
therat1989 Enthusiast Join Date: Dec 2008 Posts: 705 iTrader: 0 reviews	Yeah I know it is old but such good info. __________________ 1/8mile 8.71@80mph on street tires.

May 13th, 2010, 01:39 AM	#57
GTRACER88 Hardcore Enthusiast Join Date: May 2008 Location: Houston, TX Posts: 2,153 iTrader: 1 reviews	This is such and old thread.. Suck for you though... there was a calculator in 2007... PaladinMicro __________________ Super Slow 2011 Grabber blue V6...

May 13th, 2010, 09:22 AM	#58
Eagle2000GT MM Fanatic 2000 Mustang GT 12.73@111.36 Join Date: Aug 2007 Location: Shelbyville, IN Posts: 4,732 iTrader: 1 reviews	It's hard to do fifth gear comparisons. 4:10s with a T-3650 transmission show almost the same rpms in fifth at any given speed as 3.73s with a T-45 transmission. The T-3650 has a fifth gear ratio of .62:1. The T-45's is .67:1. I think four in an auto is the same as a T-45s fifth. Edit: My 2000 GT at 75 mph is running 2530 rpms. (T-45 with 3.73s). A 2002 GT with 4.10s will be running at 2570 rpms. At 60 mph there is only a 30 rpm difference. My 2000 GT is slightly lower than 2000 rpms. The 2002 GT is slightly above. It's so close (1.5% difference) that both would claim to be running 2000 rpms at 60 mph. __________________ ProCharger P-1SC, 9 psi, STD 396/383; Uncorrected 388/375; SAE 383/370 Mods list in Garage. Last edited by Eagle2000GT; May 13th, 2010 at 09:45 AM.

May 13th, 2010, 10:12 AM	#60
Eagle2000GT MM Fanatic 2000 Mustang GT 12.73@111.36 Join Date: Aug 2007 Location: Shelbyville, IN Posts: 4,732 iTrader: 1 reviews	I don't know. CliffyK is a tech guru and he uses .62:1 for his 2003 Mustang GT's T3650 (reference the Paladinmicro link above). I've also compared rpms with guys who have T-3650s and 4.10s. The results were what I wrote. Maybe someone else can shed some light on this. __________________ ProCharger P-1SC, 9 psi, STD 396/383; Uncorrected 388/375; SAE 383/370 Mods list in Garage.

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