Stock 3:27 vs 3:55 gears swap. Worth it?

Saleen0101 · February 20th, 2009, 05:36 PM

Will I see a huge difference if I go from 3:27 to 3:55 gears? I dont want to go any steeper than 3:55 since I drive on the highway alot.

DickH · February 21st, 2009, 12:49 AM

I have 3.73s and do a lot of highway driving. I don't think mpg changed too much. Go for 3.55 only if you get it so damn cheap you have to.

blakehunter316 · February 21st, 2009, 09:55 AM

3.73s arent bad on the highway.

moosenuk17 · February 21st, 2009, 10:09 AM

get the 373

TheUNZippee! · February 21st, 2009, 12:41 PM

Go for 3.73's.

I run 4.10's on the highway all the time. 500 miles a week. 3.73's will not be a problem. Unless you consider a perennial smile on your face a problem.

BJs03GT · February 21st, 2009, 11:19 PM

3.55 won't make much difference. Go with 3.73, still good on freeway

motomack · February 21st, 2009, 11:42 PM

Definitely 3.73s

ReverendDexter · February 23rd, 2009, 10:18 PM

Here's a really lame chart for you. Basically, this is what rpm you would have to turn with the respective gears to go the same speed as you would turning 2000 rpm with 3.27s

3.27 -- 2000 rpm
3.55 -- 2171 rpm
3.73 -- 2281 rpm
4.10 -- 2507 rpm

Eagle2000GT · February 24th, 2009, 12:03 AM

I agree that if you are going to spend the money go with 3.73s. But, this is not exactly an irreversible decision. You can tame down 3.73s with taller tires. For example, if you are currently running a 17' wheel with a tire that has a 110mm wall (245/45, 275/40, or 315/35) then you can go to perhaps a 255/50. This taller tire will make the 3.73s behave as if they were 3.55s. If you want 18" wheels then a 245/45-18 is the same diameter as the 255/50-17. Just bigger wheel and shorter tire.

The new cars coming out have advertised lower gear ratios then our. But, they are also running 20" wheels.

moosenuk17 · February 24th, 2009, 01:16 AM

^^great info!

CobraRed_96_GT · February 25th, 2009, 07:31 PM

You'll barely be able to tell the difference, 3.73's are pretty do-able and easy going.

carl_fricke · March 24th, 2009, 10:26 PM

just do 3.73's you wont be that bad off with highway driving

Mod mach · March 25th, 2009, 01:03 AM

yup if your going to spend the $$ just go for the 3.73's you'll kick yourself later on if you don't.

carl_fricke · March 25th, 2009, 06:50 AM

KaotikGT · March 25th, 2009, 06:58 PM

when i had my 01 GT i done 3:73 and wished i'd went with 4:10 i know what much

Eagle2000GT · March 26th, 2009, 08:32 AM

I now have had my 3.73s in long enough to get a good idea of the gas mileage. 3.73s will most likely reduce your gas mileage by 2 mpg. If you drive 20,000 miles per year and if gas is $3.00 per gallon then additional cost of 3.73 gears is about $273 per year. That's $5.25 per week.

zack065 · March 26th, 2009, 10:13 AM

Originally Posted by TheUNZippee!

Go for 3.73's.

I run 4.10's on the highway all the time. 500 miles a week. 3.73's will not be a problem. Unless you consider a perennial smile on your face a problem.

so true.
i would go with them

GJ Rodriguez · March 26th, 2009, 04:30 PM

Originally Posted by TheUNZippee!

Go for 3.73's.

I run 4.10's on the highway all the time. 500 miles a week. 3.73's will not be a problem. Unless you consider a perennial smile on your face a problem.

^^^hahahaha

between the 3.55 and stock, you dont gonna feel a really big difference....so go for the 3.73

Mod mach · March 28th, 2009, 01:07 AM

will how about your future plans is there a blower down the road??my bud has 3.73's on his GT and drives it about 200 miles to the track with good mpg.I guess it depends how you drive it.

YELLOW_STL_MACH · April 6th, 2009, 12:37 AM

Don't waste your money on a 3.27 to 3.55 swap.

Go 3.73 or 4.10's and you'll love them.

My Mach 1 had 3.55's stock and I swapped to 4.10's and I love them. (I drive about 90% Highway FWIW.)

February 20th, 2009, 05:36 PM	#1
Saleen0101 Regular 2001 Saleen 281 #0101 Join Date: Sep 2007 Location: Oregon Posts: 174 iTrader: 0 reviews	Stock 3:27 vs 3:55 gears swap. Worth it? Will I see a huge difference if I go from 3:27 to 3:55 gears? I dont want to go any steeper than 3:55 since I drive on the highway alot.

February 21st, 2009, 12:49 AM	#2
DickH MM Fanatic 2003 gt 5.4 32v on the way Join Date: May 2007 Location: Omaha Posts: 4,192 iTrader: 2 reviews	I have 3.73s and do a lot of highway driving. I don't think mpg changed too much. Go for 3.55 only if you get it so damn cheap you have to. __________________ 2003 Mustang gt - usual mods - slowly working on 5.4 swap 2004 srt4 - Stock DD/winter beater Click here for your tuning needs Before asking a gearing related question click THIS link and enjoy all your saved time.

February 21st, 2009, 09:55 AM	#3
blakehunter316 Regular 1989 Mustang GT 14.01 @ 103..... :( Join Date: Feb 2008 Location: Connersville Indiana Posts: 365 iTrader: 0 reviews	3.73s arent bad on the highway. __________________ vortech s-trim off road h pipe super 40's steeda tri-ax c.a.i. 3.73s subframe cnntrs 255er

February 21st, 2009, 10:09 AM	#4
moosenuk17 MM Fanatic 2000 ford mustang GT Join Date: Apr 2008 Location: san diego CA Posts: 4,011 iTrader: 0 reviews	get the 373 __________________ 2000 kenne bell GT (440HP-432TQ) Tuned by Joe at http://www.tricktuners.com dyno vid:http://youtu.be/lr3xpxw2_v8 2011 escape MUSTANG TAT CREW

February 23rd, 2009, 10:18 PM	#8
ReverendDexter Priest of the Car Gods Clapped-out '90 GT 'vert ~5.5 seconds off TTOD :( Join Date: Jan 2007 Location: Rohnert Park, CA Posts: 13,808 iTrader: 0 reviews	Here's a really lame chart for you. Basically, this is what rpm you would have to turn with the respective gears to go the same speed as you would turning 2000 rpm with 3.27s 3.27 -- 2000 rpm 3.55 -- 2171 rpm 3.73 -- 2281 rpm 4.10 -- 2507 rpm __________________ O o /¯/______________________ \|BLAAAAAAAAAAAAAAAAAAAAAAAAARGH!!! \_\

February 21st, 2009, 11:19 PM	#6
BJs03GT Newbie 2003 GT Join Date: Feb 2009 Location: hawaii Posts: 10 iTrader: 0 reviews	3.55 won't make much difference. Go with 3.73, still good on freeway

February 21st, 2009, 11:42 PM	#7
motomack Regular 2003 FORD MUSTANG GT Soon Join Date: Jan 2009 Location: nj Posts: 167 iTrader: 0 reviews	Definitely 3.73s

February 24th, 2009, 12:03 AM	#9
Eagle2000GT I Post Entirely Way Too Much 2000 Mustang GT 12.73@111.36 Join Date: Aug 2007 Location: Shelbyville, IN Posts: 5,316 iTrader: 1 reviews	I agree that if you are going to spend the money go with 3.73s. But, this is not exactly an irreversible decision. You can tame down 3.73s with taller tires. For example, if you are currently running a 17' wheel with a tire that has a 110mm wall (245/45, 275/40, or 315/35) then you can go to perhaps a 255/50. This taller tire will make the 3.73s behave as if they were 3.55s. If you want 18" wheels then a 245/45-18 is the same diameter as the 255/50-17. Just bigger wheel and shorter tire. The new cars coming out have advertised lower gear ratios then our. But, they are also running 20" wheels. __________________ ProCharger P-1SC, 9 psi, STD 396/383; Uncorrected 388/375; SAE 383/370 Mods list in Garage.

February 24th, 2009, 01:16 AM	#10
moosenuk17 MM Fanatic 2000 ford mustang GT Join Date: Apr 2008 Location: san diego CA Posts: 4,011 iTrader: 0 reviews	^^great info! __________________ 2000 kenne bell GT (440HP-432TQ) Tuned by Joe at http://www.tricktuners.com dyno vid:http://youtu.be/lr3xpxw2_v8 2011 escape MUSTANG TAT CREW

February 25th, 2009, 07:31 PM	#11
CobraRed_96_GT Newbie Join Date: Feb 2009 Posts: 5 iTrader: 0 reviews	You'll barely be able to tell the difference, 3.73's are pretty do-able and easy going.

March 24th, 2009, 10:26 PM	#12
carl_fricke Regular Join Date: Nov 2008 Posts: 100 iTrader: 0 reviews	just do 3.73's you wont be that bad off with highway driving

March 25th, 2009, 01:03 AM	#13
Mod mach Regular Join Date: Aug 2008 Posts: 126 iTrader: 0 reviews	yup if your going to spend the $$ just go for the 3.73's you'll kick yourself later on if you don't. __________________ 4Cams,4Valves,4.10's Hell yeah

March 25th, 2009, 06:50 AM	#14
carl_fricke Regular Join Date: Nov 2008 Posts: 100 iTrader: 0 reviews

March 25th, 2009, 06:58 PM	#15
KaotikGT Regular 2007 Mustang GT Join Date: Mar 2009 Location: Roanoke, Va Posts: 221 iTrader: 0 reviews	when i had my 01 GT i done 3:73 and wished i'd went with 4:10 i know what much __________________ Cervini's type iv hood, C-series bumper, Pypes mid-muffler exhaust, WMS CAI, 20" chrome wheels, Roush rear spoiler

March 26th, 2009, 08:32 AM	#16
Eagle2000GT I Post Entirely Way Too Much 2000 Mustang GT 12.73@111.36 Join Date: Aug 2007 Location: Shelbyville, IN Posts: 5,316 iTrader: 1 reviews	I now have had my 3.73s in long enough to get a good idea of the gas mileage. 3.73s will most likely reduce your gas mileage by 2 mpg. If you drive 20,000 miles per year and if gas is $3.00 per gallon then additional cost of 3.73 gears is about $273 per year. That's $5.25 per week. __________________ ProCharger P-1SC, 9 psi, STD 396/383; Uncorrected 388/375; SAE 383/370 Mods list in Garage.

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March 28th, 2009, 01:07 AM	#19
Mod mach Regular Join Date: Aug 2008 Posts: 126 iTrader: 0 reviews	will how about your future plans is there a blower down the road??my bud has 3.73's on his GT and drives it about 200 miles to the track with good mpg.I guess it depends how you drive it. __________________ 4Cams,4Valves,4.10's Hell yeah

April 6th, 2009, 12:37 AM	#20
YELLOW_STL_MACH Newbie 2003 Mach 1 ?? Join Date: Apr 2009 Location: St. Louis, MO Posts: 18 iTrader: 0 reviews	Don't waste your money on a 3.27 to 3.55 swap. Go 3.73 or 4.10's and you'll love them. My Mach 1 had 3.55's stock and I swapped to 4.10's and I love them. (I drive about 90% Highway FWIW.)

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