4.10??? 3.73??? BULLITT

4.6stang · Jan 15, 2008

I have an 01 mustang bullitt. I am going to be getting some rearend gears. I drive my car only about 10 miles a day with an average speed of 45 mph to and from school. I like to take my car to moroso on weekends. My best time to date is a 14.5 at 97 with crappy sumitomos. If I run 275/40 r17 mt et streets with 4.10 gears what would be a good estimated time to run? Also would a 3.73 gear be a better choice for me and if so about how much slower would it be than a 4.10 at the track? What rpm's would I get at 70mph on the highway with 4.10s or 3.73s. Any input would be greatly appreciated!!!:Track:

My mods are
1.upr x/pipe with slp lm2
2.Hurst shifter
3.An sct 4bank switch chip along with the gears.
4.k&n air filter

jprovence · Jan 15, 2008

N/A go 4.10s
Blown go 3.73s

4.6andSlicks · Jan 15, 2008

Here's some calculations I did to make my decision on my '01 Cobra. Not sure if the Bullitt comes with the TR3650 trans.

.....................................3.27s........3.73s..........4.10s
4th gear@40 mph........1700 ..........2040.......... 2125
...............@30 mph ......1275..........1530...........1594
5th gear@50 mph .......1400 ..........1610..........1750
...............@60 mph ......1680 ..........1932..........2100
...............@70 mph ......1920...........2208..........2450

From my stock 3.27's, 3.73's were a 15% increase in RPM and 4.10's were a 25% increase in RPM

GettinThere · Jan 16, 2008

4.6stang said:
...If I run 275/40 r17 mt et streets with 4.10 gears what would be a good estimated time to run? Also would a 3.73 gear be a better choice for me and if so about how much slower would it be than a 4.10 at the track? What rpm's would I get at 70mph on the highway with 4.10s or 3.73s...

You are a good candidate for FRPP 4.10 gears. You should be well into the 13s with 4.10s and ET Streets. With 4.10s, in 5th gear, 75mph = 2500 rpm.

Zax · Jan 16, 2008

I had 4.10s and switched to 3.73s. I like it much, much better

mazen189 · Jan 16, 2008

i say 3.73's, 4.10's are good on the street, but 3.73's are better on the highway, and like one person said, better for a blown application. but personal preference, i would go with 3.73's just because you'll still be able to get ups on the highway.....if needed.

OV10stang · Jan 16, 2008

4.6stang said:
I have an 01 mustang bullitt. I am going to be getting some rearend gears. I drive my car only about 10 miles a day with an average speed of 45 mph to and from school. I like to take my car to moroso on weekends. My best time to date is a 14.5 at 97 with crappy sumitomos. If I run 275/40 r17 mt et streets with 4.10 gears what would be a good estimated time to run? Also would a 3.73 gear be a better choice for me and if so about how much slower would it be than a 4.10 at the track? What rpm's would I get at 70mph on the highway with 4.10s or 3.73s. Any input would be greatly appreciated!!!:Track:

My mods are
1.upr x/pipe with slp lm2
2.Hurst shifter
3.An sct 4bank switch chip along with the gears.
4.k&n air filter

What are your 60ft times? You should be running high 13's - 14.0 right now with your mods... 4.10's are perfect for the 1/4 mile, but will hurt you if you are not launching correctly, or shifting at the correct rpm. Get some more seat time, you've got more potential in the setup you have now than you might think.

CobraRed_96_GT · Jan 16, 2008

Zax said:
I had 4.10s and switched to 3.73s. I like it much, much better

i did the same, although a 3.90 might be a perfect gear for someone not driving the car every single day

cobrasvtcoupe25 · Jan 16, 2008

4.6andSlicks said:
Here's some calculations I did to make my decision on my '01 Cobra. Not sure if the Bullitt comes with the TR3650 trans.

.....................................3.27s........3.73s..........4.10s
4th gear@40 mph........1700 ..........2040.......... 2125
...............@30 mph ......1275..........1530...........1594
5th gear@50 mph .......1400 ..........1610..........1750
...............@60 mph ......1680 ..........1932..........2100
...............@70 mph ......1920...........2208..........2450

From my stock 3.27's, 3.73's were a 15% increase in RPM and 4.10's were a 25% increase in RPM

Hey 4.6andslicks do you have gears in your cobra yet? If not what are you planning on putting in?

SRT Handz · Jan 16, 2008

I <3 My 3.73s

MyBloodRunsBlue · Jan 17, 2008

4.10s are great...i may be be moving down to 3.73s now since i'm supercharged

4.6andSlicks · Jan 17, 2008

cobrasvtcoupe25 said:
Hey 4.6andslicks do you have gears in your cobra yet? If not what are you planning on putting in?

Once it comes off the jack stands gettin' the H&R springs and Tokico shocks, it heads for the shop to get 4.10's.

I only use the car for fun on the weekends in the nice weather so I don't much care about the high rpm's on the highway.

cobrasvtcoupe25 · Jan 17, 2008

4.6andSlicks said:
Once it comes off the jack stands gettin' the H&R springs and Tokico shocks, it heads for the shop to get 4.10's.

I only use the car for fun on the weekends in the nice weather so I don't much care about the high rpm's on the highway.

If you did would you go with 3.73 or 3.90's or 4.10's?

As far as the 01 mustang bullitt go with 3.90's (perfect so your car)

d98gt · Jan 17, 2008

I went with 3.73s in my automatic and feel this is the perfect gear for my car and plans.

I could possibly see me going with 3.90s and being happy, though I doubt I would like the 4.10s by any means.

jprovence · Jan 17, 2008

hell, even with 3.73's I run out of gear WAY too fast. Who wants to trade for a set a 3.27s. I want more top speed.

4.10??? 3.73??? BULLITT

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