Thinking about 4:10s Need some advice

J

jprez1980

New Member

Nov 18, 2002

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Dallas, TX

Jun 22, 2004

#1

• Jun 22, 2004

• #1

Hey Gang---

Anyone know what the stock gearing is in a 03 GT with a 5 speed tranny? I am thinking about putting in 4:10's and would like to know what to expect. I drive a lot of highway miles and am worried about higher revving in 5th. Also what kind of pricing to expect for parts and install in the Dallas area?

Thanks!
JP

 

Cobra Jay

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Apr 7, 2004

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Motor City

Jun 22, 2004

#2

• Jun 22, 2004

• #2

THe stock gear ratio is 3.27. 4.10's are o.k. for use on the e-way, but if you plan on installing a S/C someday, go with a 3.73 insted. If you're worried about RPM's, go here and click on CALCULATORS www.differentials.com. You'll be able to see what your engine will be turning at specific MPH in 5th gear. Use .67 for the trans ratio. This will help you make your decision.

 

scalder

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Aug 1, 2003

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Dallas/Plano TX

Jun 22, 2004

#3

• Jun 22, 2004

• #3

I had 4.10's for a few months and running 75+ all day long was no big deal. Now the 4.30's on the other hand.....

 

GTvert01

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Nov 24, 2003

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West Plains, MO

Jun 22, 2004

#4

• Jun 22, 2004

• #4

No problem with the 4.10s and the hwy.I get 23-24mpg @ 70+mph.

 

jrc_03_gt

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Jan 1, 2004

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Jun 22, 2004

#5

• Jun 22, 2004

• #5

get 4.10"s ! I just got mine put in last week.

 

J

jprez1980

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Nov 18, 2002

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Dallas, TX

Jun 22, 2004

#6

• Jun 22, 2004

• #6

Cool thanks guys...how much are the parts and where in the Dallas area can I get them installed?

Thanks!

 

scalder

Member

Aug 1, 2003

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Dallas/Plano TX

Jun 22, 2004

#7

• Jun 22, 2004

• #7

Well I had my 4.10's installed at Dallas Mustang..when my axles gave up I had 4.30's, axles, etc done at Lonestar Performance. Their pricing is a little better and they aren't complete arse's like DMP.

 

M

moreause

New Member

Dec 24, 2003

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Jun 22, 2004

#8

• Jun 22, 2004

• #8

GT JAY said:

THe stock gear ratio is 3.27. 4.10's are o.k. for use on the e-way, but if you plan on installing a S/C someday, go with a 3.73 insted. If you're worried about RPM's, go here and click on CALCULATORS www.differentials.com. You'll be able to see what your engine will be turning at specific MPH in 5th gear. Use .67 for the trans ratio. This will help you make your decision.

Click to expand...

Can somebody tell me if there is a difference between the us and the canada i always see 0.67 for fifth that was t-45 it's 0.68 for tremec but mine is 0.62 and i check with a friend and it is the same. So i don't know if usa as a shorter fifth or what???

 

Cobra Jay

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Apr 7, 2004

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Motor City

Jun 22, 2004

#9

• Jun 22, 2004

• #9

moreause said:

Can somebody tell me if there is a difference between the us and the canada i always see 0.67 for fifth that was t-45 it's 0.68 for tremec but mine is 0.62 and i check with a friend and it is the same. So i don't know if usa as a shorter fifth or what???

Click to expand...

Not sure there is a difference.


According to these 2 links the 04's are .68 and the 03's are .67
I was also told by the dealer, .67 for mine.

www.mustangmeet.com/specs/2003.php
www.mustangmeet.com/specs/2004.php

They could be wrong though. If you notice they show 3.55's for both the 04 GT's and the MACH1's 5spds. and and 2.49's for the auto's which is in accurate.

 

M

moreause

New Member

Dec 24, 2003

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Jun 22, 2004

#10

• Jun 22, 2004

• #10

ok then is't going to be numbers then i used to run 2000 rpm at 120kph/74.4 mph with 3.27 and now i'm running 2250 at 120kph/74.4mph with 3.73 that is what i get with 0.62...i check all rpm and number in excel to make sure every thing was right.

so if you have a minute give me your speed vs rpm to make sure

 

J

Joel's98GT

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Jan 3, 2004

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central OH

Jun 22, 2004

#11

• Jun 22, 2004

• #11

Overdrive in a t-3650 is .62 it has always came with this ratio

3.27 is the ONLY gear option on 99+ GT's from the factory

 

Cobra Jay

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Apr 7, 2004

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Motor City

Jun 22, 2004

#12

• Jun 22, 2004

• #12

moreause said:

ok then is't going to be numbers then i used to run 2000 rpm at 120kph/74.4 mph with 3.27 and now i'm running 2250 at 120kph/74.4mph with 3.73 that is what i get with 0.62...i check all rpm and number in excel to make sure every thing was right.

so if you have a minute give me your speed vs rpm to make sure

Click to expand...

I'm just about to leave work, so I'll hit the e-way get up to 75 (or more )then let you know later on or tomorrow.

 

jrc_03_gt

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Jan 1, 2004

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Jun 22, 2004

#13

• Jun 22, 2004

• #13

I have an 03 gt at 90mph I tack around 3000 RPM"S in 5th gear. I have frpp 4.10"s.

 

Cobra Jay

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Apr 7, 2004

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Motor City

Jun 23, 2004

#14

• Jun 23, 2004

• #14

At 75mph I was at 2000. Must be a .62 o.d. Looks like I was given some bad info. That's cool though. With 4.10's at 75 I'll only be turning 2502. 80=2669 85=2836. Sweet!