3:55 or 3:73 gears....Need advice - Mustang Evolution

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Old 06-24-2008, 10:24 AM   #1
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Question 3:55 or 3:73 gears....Need advice

I got a pretty much all stock 95 GT that has just a few basic bolt on things/exhaust system. I'm gonna change the gears in her but Im stuck on which gears I should get....3:55 or 3:73. I want to gain the low end torque without losing much on my top end so Im unsure on which to go with. I know everybody says to go with 3:73 gears but I dont know enough to know what the big difference is between the two. I want it to be worth my time but Im not trying to make it into a drag car just yet cause the whole cost of doing so is stopping me. I basically want to achieve an everyday driving car that has a little bit more move to it than just a normal stock one would have. Feel free to leave any other suggestions if you think it would be best to go another direction. THanks all!
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Old 06-24-2008, 11:37 AM   #2
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Re: 3:55 or 3:73 gears....Need advice

Differential Gear Ratio determines the number of times the drive shaft (or pinion) will rotate for each turn of the wheels (or ring gear). So if you have a 3.73:1 gear ratio the drive shaft turns 3.73 times for every turn of the wheel.

Gear ratio is calculated by dividing the number of teeth on the ring gear by the number of teeth on the pinion gear. The higher the number, the lower the ratio: a 5.29 gear has a lower ratio than a 4.10 gear. With a lower gear ratio the drive shaft (and thus the engine) turns more for each revolution of the wheel, delivering more power and torque to the wheel for any given speed. Lower ratios are generally desirable when going off-road. Higher ratios are better for freeway driving since they run at lower RPM’s and offer better fuel economy

I've found the 3:73 to be a good overall gears sometime I wish I had the 4:10 But I'm happy with the 3:73 And With The Climbing Gas Prices, Go 3:55 If You Do A Lot Of Highway Driving. If You Stay On Streets Then The 373's Will Work
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Old 06-24-2008, 07:56 PM   #3
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Re: 3:55 or 3:73 gears....Need advice

I have the 3.73's as well and I really like them....there's not much of a difference between the 3.55's and 3.73's so i would say go with the 3.73's.....you're not going to gain much in MPG if you drop to the lower gears.
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Old 06-24-2008, 08:58 PM   #4
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Re: 3:55 or 3:73 gears....Need advice

3.73, you wont notice jack with 3.55 some cars came stock with them.if u decide on 3.55 i got 5 used sets on the shelf.
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Old 06-24-2008, 09:00 PM   #5
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Re: 3:55 or 3:73 gears....Need advice

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3.73, you wont notice jack with 3.55 some cars came stock with them.if u decide on 3.55 i got 5 used sets on the shelf.
I may know someone wanting one of those sets.

Hmm...I may want a set as well for the fox now that I Think about it. Trade you my 4.10's that are in the rear end at the house for a set of those 3.55's.
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Old 06-24-2008, 09:28 PM   #6
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Re: 3:55 or 3:73 gears....Need advice

neither...4.10's...that is all...

Unless you are already or intend to go FI in the never near future, 4.10's would work best for your application...

If you are or will be going FI, then 3.73's...
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Old 06-24-2008, 10:20 PM   #7
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Re: 3:55 or 3:73 gears....Need advice

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neither...4.10's...that is all...
4.10's are really low for that tranny....first gear is 3.35 so in slow traffic the car will buck and jerk
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Old 06-25-2008, 06:17 AM   #8
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Re: 3:55 or 3:73 gears....Need advice

Is this an automatic or manual?

The general rule that most go by is 3.73s for a manual, 4.10s for an automatic.
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Old 06-25-2008, 07:04 AM   #9
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Re: 3:55 or 3:73 gears....Need advice

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Is this an automatic or manual?

The general rule that most go by is 3.73s for a manual, 4.10s for an automatic.
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Old 06-25-2008, 07:14 AM   #10
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Re: 3:55 or 3:73 gears....Need advice

i always run 4.10s on a n/a combination.. they are most effective.

rob, we can trade if you want.
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Old 06-25-2008, 07:49 AM   #11
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Re: 3:55 or 3:73 gears....Need advice

3.55 vs 3.73 is very minimal in difference, go 3.73
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Old 06-25-2008, 09:22 AM   #12
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Re: 3:55 or 3:73 gears....Need advice

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Originally Posted by SimplyOrangeTPS View Post
i always run 4.10s on a n/a combination.. they are most effective.

rob, we can trade if you want.
I'll pull them out of that rear end and let you take a look at them. If you like then we can swap gears.

What all will you want? Obviously the ring and pinion, anything else from it like spider gears or anything?
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Old 06-25-2008, 10:32 AM   #13
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Re: 3:55 or 3:73 gears....Need advice

naa, we can just swap the gears. imma go 3.55 too when i hit the 800 rwhp mark
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Old 06-26-2008, 01:43 AM   #14
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Re: 3:55 or 3:73 gears....Need advice

what kind of mileage loss can a 2001 v6 expect when going with the 3.73 gears?
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Old 06-26-2008, 07:43 AM   #15
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Re: 3:55 or 3:73 gears....Need advice

not enough to matter, even with 4:10s its not very significant because it doesent take as much power to get the car moving but loses it on long drives, so it balances out.
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Old 06-26-2008, 07:53 AM   #16
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Re: 3:55 or 3:73 gears....Need advice

in my 01 v6 with 3.73, cai, upd, and exhaust (manual trans) I would get 22mpg city/hwy mix. I would say you will lose 2mpg on the highway maybe 3 and gain about 1 in the city.
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Old 06-26-2008, 11:26 AM   #17
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Re: 3:55 or 3:73 gears....Need advice

Thank you for your help.
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Old 06-26-2008, 11:50 AM   #18
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Re: 3:55 or 3:73 gears....Need advice

Hey all, thanks for the great info/advice. I greatly appreciate it. Im gonna go ahead and go with the 3:73's...as that sounds like the best thing for me at this time. However, SimpleOrangeTPS, I also am interested in a set of your 3:55's as well. What you want for a set of them??? Let me know. Thanks again!
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Old 06-26-2008, 06:18 PM   #19
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Re: 3:55 or 3:73 gears....Need advice

i got 4.11's in my stock 94 gt and well my trannys out but im puttin a t-5 in it
will that be good 4.11's with a 5-speed ?
or i got 2.73's
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Old 06-26-2008, 06:57 PM   #20
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Re: 3:55 or 3:73 gears....Need advice

youll be fine, dont change them ill u try it.

i wanna put 4.30s behind my t56
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Old 06-27-2008, 01:33 AM   #21
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Re: 3:55 or 3:73 gears....Need advice

I know I had already said earlier that I was going to go with 3.73's from the great info. you all gave me, but I had heard that changing to 3.73 gears will burn out your AC unit fairly quickly. How true is this???? If it is true, how fast will this occur and is there anyway to prevent this from happening? Also, will the same thing happen if I was to use 3.55's instead of 3.73's???
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Old 06-27-2008, 07:24 AM   #22
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Re: 3:55 or 3:73 gears....Need advice

idk who told you that but it is incorrect, the engine rpm does not change enough to damage anny engine component, like i said every shop car that we have has 4:10 and perfectly working a/c.i dont exactly understand the reasoning behind that statement.
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Old 06-29-2008, 06:26 AM   #23
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Re: 3:55 or 3:73 gears....Need advice

Looking around a few places to buy my 3:73's, but when looking Ive noticed some places say to also buy a bearing kit or something like that when buying. Do I really need to buy this??? Also, where is a good place to buy them from (gears and bearing kit if needed)??? Also, is there also an additional part I need to buy to adjust my speedo after I put in the gears??? If so, is there a good place I should pick that up from cause I was searching around and a few places said that their part would be as close as I could get to correcting my speedo....I dont want a crap part that will almost correct it, I want one that will. Your knowledge and help has been and will continue to be greatly appreciated. Thanks all!
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Old 06-29-2008, 08:29 AM   #24
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Re: 3:55 or 3:73 gears....Need advice

Ford Racing Performance Parts - GEFRacing.com is a good place to buy.

If you want to really correct speedo, you will need a different speedometer gear. Depending on your transmission, you may also need a different drive gear to really get the speedo correct. With the drive gear and speedo gear, you can get the speedo 100% correct (ok... maybe 99.2...).

Here's a link where you can find the exact speedo and drive gear combo you need for your gears and tires: Speedometer Gear Selector
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Old 06-29-2008, 12:32 PM   #25
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Re: 3:55 or 3:73 gears....Need advice

you will need a new pinion bearing at the least, can be bought at your local parts store. and depending on who sets up your gears, you may have to buy a shim kit.
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Old 07-01-2008, 10:55 AM   #26
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Re: 3:55 or 3:73 gears....Need advice

Was wondering if I should buy a set of very lightly used 3.73 gears for the half the price of a new set ($150)???? There appears to be no chips/unusual wear on them, and as far as I was told they are in good to like new condition. Are used gears fine as long as there are no chips/unusual wearing??? Or is this something I should just pay the few extra bucks for and buy the new ones???
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Old 07-01-2008, 12:29 PM   #27
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Re: 3:55 or 3:73 gears....Need advice

used gears are fine.
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Old 07-13-2008, 10:56 PM   #28
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Re: 3:55 or 3:73 gears....Need advice

what? nobody suggested 3.90's?????
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