3.55 or 3.73

98gtblue

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Dec 15, 2003

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houston

Feb 11, 2004

#1

• Feb 11, 2004

• #1

i have a 98 gt 5 speed with Lt headers,o/r h pipe,flows, 70mm tb, cai, pullies, and short shifter......should i go with 3.55 gear or 3.73. still have to drive on highway to work everyday. also friend is selling me his 3.73 for $80 but 3.55 dont need to be recalibrated. which gear should i choose? thanks
also what rpm at 70mph on 3.73?

 

mogs01gt

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Jul 22, 2002

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Feb 11, 2004

#2

• Feb 11, 2004

• #2

3.73

 

Graham052

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May 7, 2003

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Feb 11, 2004

#3

• Feb 11, 2004

• #3

3.73 without a doubt, sorry I cant remember rpm's of the top of my head

 

NasaGT

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Sep 19, 2002

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Feb 11, 2004

#4

• Feb 11, 2004

• #4

3.73. Prepare for a bunch of people saying 4.10 even though you didn't list it as an option.

 

T

true blue blood

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Dec 15, 2002

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Feb 11, 2004

#5

• Feb 11, 2004

• #5

Not to sound stupid but Are those gears from your friend used? If so don't use them. Yeah everyone is gonna say 4.10's and thats what I would say, depending on how much highway driving you do would be the deciding factor but definetly do the 3.73's if 4.10's aren't for you, 3.55's just don't cut it!

 

GTvert01

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Nov 24, 2003

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West Plains, MO

Feb 11, 2004

#6

• Feb 11, 2004

• #6

definitely 3.73 over the 3.55s, the calibration is just a speedo gear for the 98s takes about 2 minutes to change and costs about $10.

 

mrvax

Stay thirsty my friends

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Nov 29, 1999

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SN Moderator: Orlando, Fl.

Feb 11, 2004

#7

• Feb 11, 2004

• #7

GTvert01 said:

definitely 3.73 over the 3.55s, the calibration is just a speedo gear for the 98s takes about 2 minutes to change and costs about $10.

Click to expand...

3.73s for sure. 2300rpms in 5th at 70.
Do not swap your speedo gear. Keep the stock one in there and buy a Dallas Speedcal. The speedo gear will still be off about 10% and it will get chewed up and fail within a few months. I hold the world record for longest speedo gear swap before failure. 13months and 13,000 miles.

 

Slapyo

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Feb 8, 2003

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Anaheim, CA

Feb 11, 2004

#8

• Feb 11, 2004

• #8

i would say go for the 3.73s.

 

Camshaft213

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Dec 12, 2002

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huntsville, AL

Feb 11, 2004

#9

• Feb 11, 2004

• #9

3.73s, but i STRONGLY urge you to get 4.10s

 

G

GinoGT

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Aug 11, 2002

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#10

• Feb 11, 2004

• #10

I guess I'll be the one to demand 4.10's and then go on telling you that anything less is . I don't want to see anyone go with anything less unless they have a supercharger sitting in their garage, none of that "power adder in the future" crap.

 

Dallasgt01

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Dec 31, 2003

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Feb 11, 2004

#11

• Feb 11, 2004

• #11

i would use 3.73's i have 3.55 and like them but i drive to much highway for the 4.10 so my next upgrade is 3.73

 

NitroDuck

I put out on the 1st date

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Aug 17, 1999

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Feb 11, 2004

#12

• Feb 11, 2004

• #12

if you swap the gearset you'll need to recalibrate, no matter what. also, i wouldn't put in used gears, they'll most likely be noisier, and you can get new frpp gears extremely cheap from gef.

truthfully i'd go with 3.73s bare minimum. 4.10s are where its at, though you operate in a lower powerband with NPI heads.

 

GTvert01

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Nov 24, 2003

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Feb 11, 2004

#13

• Feb 11, 2004

• #13

DallasGT,are you talking about the GT or the cobra? I have a 01 GT convertible and still get around 26 hwy mpg with 4.10s

 

StangJonGT

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Jun 2, 2001

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Seattle

Feb 11, 2004

#14

• Feb 11, 2004

• #14

3.73s, no doubt.

 

KJ Hoppus

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Mar 18, 2003

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Elk Grove CA

Feb 11, 2004

#15

• Feb 11, 2004

• #15

3.73s