[01bullitt]

Guys - Iknow this topic has been discussed before but everyone that has added gears has had some other mod done before it.

Can anyone tell me what a bullitt with a densecharger as the only mod would benifit from a 3.55 or 3.73 gear?

What numbers might i expect?

I know alot of you like 4.10s but i drive my bullitt more on the street than on the track

 

[Bushmaster]

4.10s will in no way affect the driveability of your car on the street. There's just no down side to having those gears. I've logged every gas stop since I got my car (10K miles ago) and there was no difference in fuel economy.
I drive my car to and from work every day and everywhere else I have to go....it's my only car....and I wouldn't consider trading my 4.10s out. They are the perfect rear axle ratio for GTs and Bullitts with manual transmissions.

 

[Barnaby]

I would have to disagree with Bushmaster. I installed 4.10s when I bought my car. It was way too much gear for me on the street. I was constantly in one gear higher, including from a stop. It never felt right to me. I have since put 3.73 in the car and it feels much better to me. Maybe it's due to the blower, but I won't consider 4.10s again for a street car(maybe for a Cobra).

 

[Cochese]

Bushmaster, that's good to hear since DHG #3875 wants to drag race at the local strip soon! It is mostly a fair weather cruiser but I would like better E/Ts too. Thanks for that info! :smile:

 

[Cochese]

Whoa! Barnaby put a post in while I was writing my last one...now I don't know what to do about the gears. ???

 

[Bushmaster]

Ask on the Corral where lots and lots of guys have done gear swaps, and take a consensus of the answers. You don't even have to ask.....just check the archives.
That's the first I've ever heard of anyone swapping 4.10s for 3.73s, but I've heard of it happening the other way around many, many times. I also suspect the blower may be a factor.
One thing I really like about the 4.10s in my car....when I do race it, I hit the top end traps at near redline.....seems like a perfect gear for the car.

 

[Barnaby]

Everyones different. I personally didn't like being at such a high rpm on the highway or having to be in a gear higher most of the time.

As an aside, I also road race my car. 4.10s were way off for the track I go to. I was entering turns in 3rd at 5800-6000 and needed to down shift with no way to do that with 4.10s. I would have gone beyond redline. Note, this was only one factor to me changing back to 3.73s. The majority of the reason I did was for street driving.

 

[Bushmaster]

Definitely everyone's different. The best advice I can give anyone about anything like that is find someone who has the different ratios in their cars, and get them to let you check it out. I've done that for a bunch of folks....I'm happy to since that's how I decided on what I wanted.
One qualification to my earlier statement about there not being a downside to the 4.10s......in my case there is. My car has the dreaded "piston slap" or whatever the hell it is, and when it's really cold outside, it happens at about 2200 rpm. With the 4.10s, that means shifting into fifth gear at about 45 mph to avoid the nasty noise, which is kind of a nuisance. But that's not on the gears, it's on Ford for designing an engine that has that kind of thing going on inside.

 

[Bullitt4542]

I would have to agree with Barnaby. This isn't an arguement here :smile:. But my opinion is that the 4:10's are a little too much for everyday driving. I put the 3:73's in mine and without a doubt I feel a difference. The only way i would consider the 4:10's if I was gonna spend some time at the track. Good luck with whatever you decide.

 

[01bullitt]

Can anyone tell me what i can expect from 3.73s?

 

[5111]

<TABLE BORDER=0 ALIGN=CENTER WIDTH=85%><TR><TD><font size=-1>Quote:</font><HR></TD></TR><TR><TD><FONT SIZE=-1><BLOCKQUOTE>
On 2002-02-26 18:23, 01bullitt wrote:
Can anyone tell me what i can expect from 3.73s?

</BLOCKQUOTE></FONT></TD></TR><TR><TD><HR></TD></TR></TABLE>

What exactly do you mean?

 

[01bullitt]

what kinda performance do the 3.73s offer than the 3.73s?

how much more horse gets to the rear wheels?

how much does it improve my 0-60 time if at all?

 

[5111]

<TABLE BORDER=0 ALIGN=CENTER WIDTH=85%><TR><TD><font size=-1>Quote:</font><HR></TD></TR><TR><TD><FONT SIZE=-1><BLOCKQUOTE>
On 2002-02-26 18:54, 01bullitt wrote:
what kinda performance do the 3.73s offer than the 3.73s?

how much more horse gets to the rear wheels?

how much does it improve my 0-60 time if at all?

</BLOCKQUOTE></FONT></TD></TR><TR><TD><HR></TD></TR></TABLE>

Keep in mind that I am no expert, so anyone feel free to correct me. I don't know times, but no extra horsepower gets to the rear wheels. What gears do is take you closer/faster to the higher RPMs which is where your power is. In other words, it makes the existing power more accessible.

Notice that I do not have aftermarket gears.
_________________
'01 Bullitt DHG
'89 Mustang GT
K&N Air Filter
Solargard HPTG 30%
1 1/4" Spacers

<font size=-1>[ This Message was edited by: 5111 on 2002-02-26 19:01 ]</font>

 

[5111]

Here is something that llama_boy posted a while back on gears. It lets you see what RPMs you would turn at a given speed for different gearing.

<TABLE BORDER=0 ALIGN=CENTER WIDTH=85%><TR><TD><font size=-1>Quote:</font><HR></TD></TR><TR><TD><FONT SIZE=-1><BLOCKQUOTE>
On 2001-09-22 12:33, llama_boy wrote:
Ran across a great calculator that provided the following results. From these results I think the 3.73s ould be a better choice all around. They offer lower highway RPMs, yet on the 1/4 mile they will allow you to finish near the top of the power curve in 4th gear. The 4.10s would be a better choice if the HP curve did't drop off so much..

http://www.smokemup.com/utilities/calc/mph_range2.cfm


Transmission Ratios:
1st: 3.37 2nd: 1.99 3rd: 1.33 4th: 1 5th: .67

Tire Diameter: 26.75 inches Rear Gear Ratio: 3.27:1
MPH
RPM 1st 2nd 3rd 4th 5th 6th
1000 8 13 19 25 37
1500 11 19 28 37 55
2000 15 25 37 49 73
2500 19 31 46 61 91
3000 22 37 55 74 109
3500 26 43 65 86 128
4000 29 49 74 98 146
4500 33 56 83 110 164
5000 37 62 92 122 182
5500 40 68 101 134 200
6000 44 74 110 147 218
6500 47 80 119 159 237
7000 51 86 129 171 255
7500 55 92 138 183 273
8000 58 98 147 195 291


Tire Diameter 2: 26.75 inches Rear Gear 2: 3.73:1
MPH
RPM 1st 2nd 3rd 4th 5th 6th
1000 7 11 17 22 32
1500 10 17 25 33 48
2000 13 22 33 43 64
2500 16 27 41 54 80
3000 19 33 49 65 96
3500 23 38 57 75 112
4000 26 43 65 86 128
4500 29 49 73 97 144
5000 32 54 81 107 160
5500 35 59 89 118 176
6000 38 65 97 129 192
6500 42 70 105 139 207
7000 45 76 113 150 223
7500 48 81 121 161 239
8000 51 86 129 171 255


Tire Diameter 2: 26.75 inches Rear Gear 2: 4.10:1
MPH
RPM 1st 2nd 3rd 4th 5th 6th
1000 6 10 15 20 29
1500 9 15 22 30 44
2000 12 20 30 39 58
2500 15 25 37 49 73
3000 18 30 44 59 87
3500 21 35 52 68 102
4000 24 40 59 78 116
4500 26 44 66 88 131
5000 29 49 73 98 145
5500 32 54 81 107 160
6000 35 59 88 117 174
6500 38 64 95 127 189
7000 41 69 103 136 203
7500 44 74 110 146 218
8000 47 79 117 156 232
</BLOCKQUOTE></FONT></TD></TR><TR><TD><HR></TD></TR></TABLE>

 

[llama_boy]

Thanks for the reference. Although I have now decided to go with the 4.10s and not the 3.73s b/c I am more interested in track performance and I'm willing to give up a little streetablility. Additionaly I plan a few more modificaitons and hope to bring my trap speeds, the 4.10s will then be even more benefitial.

 

[Mus408]

I think the 3.73s are the best gear for all around performance. You will need some better tires to see the best results at the track,with the 3.73s or 4.10s. As far as switching from 4.10s to 3.73s,I see it a lot,as it is just a way of dialing in a useable combination. I had to go from 4.11 to 3.89 on my 85 LX,because a carb mod,let the car accelerate quicker in the 1/4 mile,resulting in hitting the RPM limit before the traps. Going back to a 3.89 kept the RPM in check,resulting in a better ET and MPH. Plus it helped a bit in my cruise RPM.

<font size=-1>[ This Message was edited by: Mus408 on 2002-02-27 22:07 ]</font>

 

[ADEQ8]

I guess this is as good a place as any to jump in... Does anybody out there have 3.55's? Why not?

 

[PaLiAcH]

3.55's not worth it... My opinon

 

[retromuscle]

<TABLE BORDER=0 ALIGN=CENTER WIDTH=85%><TR><TD><font size=-1>Quote:</font><HR></TD></TR><TR><TD><FONT SIZE=-1><BLOCKQUOTE>
On 2002-02-27 23:18, adequate wrote:
I guess this is as good a place as any to jump in... Does anybody out there have 3.55's? Why not?
</BLOCKQUOTE></FONT></TD></TR><TR><TD><HR></TD></TR></TABLE>

They aren't worth the money and hassle for the minimal performance gain. Sure they would help, but only a little. And at $200 for the gears, $100 for the SpeedCal, and $200ish for the install? It's just not worth putting out the money.

But since 3.73's and 4.10's still cost you that same $500 but with a bigger performance gain, they make the 3.55's an obsolete ratio for the 99+ Mustang.

 

[roushraven99]

That's true unless of course you have a torque monster power adder like a Kenne Bell or Eaton type blower. Then you will need the 3:55's to save your tires and make your stang more streetable.