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Discussion Starter #1
You will probably think this is a really stupid question and I feel embarassed having to ask you. But, I won't know unless I do. Right?
Well, heres hoping that you will share that experience and knowledge with me! It's about the gears, ratio's and so forth PLEASE.....
I think I would like to change my gears, I know I want to install my Steeda Tri-Ax Short Throw Shifter and since I need to open my differential to replace my Carrier and Pinion bearings, wouldn't this be the best time. What are gear ratio's! What exactly does that mean. I know my 2007's stock gears are 3.31. What can I expect then with each of the gears below? Are there any pros or cons? How would they differ from the original 3.31
Can we have a class and we'll call it

GEARS 101?

3.55
or
3.73
or
4.11
or
4.56
 

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The Blue Dragon
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The ratios have to do with numbers of turns of the driveshaft vs the rear wheels. A 3.55 gear is actually 3.55:1 ratio. For everytime the driveshaft turns 3.55 turns, the rear wheels will complete one revolution. The shorter the gear (gears get shorter as their ratio number increases) the higher the tq multiplication and you will get more of that being sucked into the seat feeling. But it also takes higher rpms to go the same speed. For example (not exact numbers but used to prove a point) with 3.31 gears you will be traveling 70 mph at 1800 rpms and with 4.10's the same speed might be achieved at 2600 rpms
 

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GrabberBlue5.0 said:
The ratios have to do with numbers of turns of the driveshaft vs the rear wheels. A 3.55 gear is actually 3.55:1 ratio. For everytime the driveshaft turns 3.55 turns, the rear wheels will complete one revolution. The shorter the gear (gears get shorter as their ratio number increases) the higher the tq multiplication and you will get more of that being sucked into the seat feeling. But it also takes higher rpms to go the same speed. For example (not exact numbers but used to prove a point) with 3.31 gears you will be traveling 70 mph at 1800 rpms and with 4.10's the same speed might be achieved at 2600 rpms
That makes since, so for of the line you want long gears and just cruising you want short.
 

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I have 3.73's running 2300 rpm at 65 mph but I do have a tremic tko 500 5 speed so mine will be a little different
 

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I would say if you want better acceleration but not sacrifice too much gas mileage you should go with 3.73.
 

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My car has 3.90's in it. As long as I cruise in 6th, it's not as rough on gas.
 

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Discussion Starter #11
I would say if you want better acceleration but not sacrifice too much gas mileage you should go with 3.73.
With 3.73
You're saying I will have more torque( low end power) in 1st, 2nd and 3rd but, what happens in 4th and 5th? As it is I rarely drive in 5th even on the freeway, because if I need an out, I don't want to have to down shift. Plus driving on the Los Angeles freeways the only time you can drive the speed limit or faster is late evening.



My car has 3.90's in it. As long as I cruise in 6th, it's not as rough on gas.
So, with 3.55
The trade off will be looking for a 6th gear in my 5 speed mustang? Please correct me if I am wrong. But even more so?



And what are the differences between 3.31 and 4.11?


3.31 And 4.56
 

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Discussion Starter #13
GrabberBlue5.0

What gears are in your car? Are they stock? If not, what did you change them to and why?
 

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3.31 vs 3.73 is about .25 faster in the quarter, 4.10 is a bit more and so on.

The .25 is not really huge by any means FYI in terms of feeling it. Going from 2.73 to 3.73 you get much more of a bang for the buck like older stangs had.
 

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The Blue Dragon
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With 3.73
You're saying I will have more torque( low end power) in 1st, 2nd and 3rd but, what happens in 4th and 5th? As it is I rarely drive in 5th even on the freeway, because if I need an out, I don't want to have to down shift. Plus driving on the Los Angeles freeways the only time you can drive the speed limit or faster is late evening.

So, with 3.55
The trade off will be looking for a 6th gear in my 5 speed mustang? Please correct me if I am wrong. But even more so?

And what are the differences between 3.31 and 4.11?

3.31 And 4.56
Gears will not give you more tq, only engine modifications can do that, but the gears will make it feel more torque ish.
 

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Discussion Starter #17
My biggest complaint is the sluggishness upon acceleration! I am big on maintenance so my engine runs great. It just feels like **** when l accelerate from 1st to 2nd and 3rd. Hence this Thread. I thought without the installation of a supercharger perhaps gears would do the trick. I would love to hand over my car to someone trustworthy and say make it quicker without breaking my wallet.

So, you think that 3.73s will help? Is there anything else? Keep in mind, it is my daily driver.

Shoot, I was given a 1969 Mach1 for a wedding gift a couple of years ago, actually in 2009. It is a project car. l should be focusing on that. No, thats a whole different story
 

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Discussion Starter #18 (Edited)
All right, I've made the appointment and my car goes in the shop this Thursday to have a complete Differential Bearing Kit and 3.73 Ring and Pinion gears including labor.

The Cost $600.00

But, now my husband is telling me to upgrade my rearend to an 8.8! Is this better? Do you foresee any problems? Also, what does this mean performance-wise? The mechanic said it would be better. How so? (l forgot to ask him)
 

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All right, I've made the appointment and my car goes in the shop this Thursday to have a complete Differential Bearing Kit and 3.73 Ring and Pinion gears including labor.

The Cost $600.00

But, now my husband is telling me to upgrade my rearend to an 8.8! Is this better? Do you foresee any problems? Also, what does this mean performance-wise? The mechanic said it would be better. How so? (l forgot to ask him)
The 8.8 is stronger and hold together better!..
 
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