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Old 03-24-2013, 11:23 PM   #1
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Steeper Gears

Hey guys I am running 2:73 gears on the rear right now on my Stang. I'm planning on jumping to 3:73 soon. I know 3:73 will help me accelerate quicker in the lower rpms but it will also reduce my top speed. Will it help acceleration all throughout the rpm band? Or just lower rpms? Thanks in advance
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Old 03-24-2013, 11:47 PM   #2
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Gears don't change through the rpm band. Of course you will accelerate better at your peak rpm but gears don't have a low end or high end, they just help you accelerate. Yea they will reduce your top speed, but really when are you ever even going to get there lol?
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Old 03-25-2013, 02:27 AM   #3
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I have 4.10s in a stock suspension foxbody vert. I will say that it is hard for me to put power down (previous owner removed quad shocks) I do a lot of Highway driving and probably would drop to 3.55 if given the chance. That being said I do enjoy how quickly it revs, especially in 2nd gear, it jumps from 2k RPM to 4K in before the wheelhop stops.
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Old 03-25-2013, 04:53 AM   #4
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I just got mine back from the shop, had 3.73 gears put in. Still taking it easy on her, but so far I love it.
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Old 03-25-2013, 07:31 AM   #5
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Quote:
Originally Posted by Soccerluvr4 View Post
Gears don't change through the rpm band. Of course you will accelerate better at your peak rpm but gears don't have a low end or high end, they just help you accelerate. Yea they will reduce your top speed, but really when are you ever even going to get there lol?
My thoughts exactly. I would much rather be able to get up and go then have a high top speed.
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Old 03-25-2013, 07:59 AM   #6
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Yea when are you really going to be going even 100 without the chance of getting thrown in jail lol. I'd much rather be able to launch hard and have a mean 0-60 or 1/4th time than worry about being able to go 160.

Although I have 4.10's in my 05 and I can still go at least 145
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Old 03-25-2013, 08:47 AM   #7
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I think the math is pretty simple. Your ratio is changing by 36%. So, if you used to cruise at 2500 rpm, you will now cruise at 3400 rpm, as an example. I could be wrong, but I don't think so. If you do ANY highway driving, your mileage will suffer. For a lot of people, it is a worthwhile trade off. Gas is $4/gal in MI for premium now, so it's up to what your wallet can take.
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Old 03-25-2013, 08:58 AM   #8
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Originally Posted by matcox83 View Post
I think the math is pretty simple. Your ratio is changing by 36%. So, if you used to cruise at 2500 rpm, you will now cruise at 3400 rpm, as an example. I could be wrong, but I don't think so. If you do ANY highway driving, your mileage will suffer. For a lot of people, it is a worthwhile trade off. Gas is $4/gal in MI for premium now, so it's up to what your wallet can take.
+100 good point. I went to 4.10's from 331's and I lost a good solid 6-7 mpg average.

---------- Post added at 08:58 AM ---------- Previous post was at 08:57 AM ----------

Also I don't like the effect the higher cruising RPMS had on my exhaust tone.
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Old 03-25-2013, 09:36 AM   #9
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Also depends on what tranny you have. If you don't have an OD gear, then it'll be worse. If you have or plan on getting a tranny with OD, then it's not going to hurt you nearly as much. The biggest issue is ( as mentioned) your cruising RPM at 70-80 mph.
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Old 03-25-2013, 11:19 AM   #10
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Thanks for the help guys. I currently have a C4 3 speed tranny but am close to getting an AOD tranny.
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Old 03-25-2013, 12:59 PM   #11
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Thanks for the help guys. I currently have a C4 3 speed tranny but am close to getting an AOD tranny.
OD would being you back to where you were before the gear swap. Wow 2.73 to 3.73, you'll feel like your ears are going fly off.
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Old 04-07-2013, 10:25 PM   #12
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I am doing the 8.8 swap right now on my 65 I6 and am going from 2.73 to 4.10 with pozi. I am really hoping that it is as good as everyone says it is because it is also a lot more work then they make it seem like.
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Old 05-02-2013, 08:23 PM   #13
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Those 4:10s are going to make you cry when it comes time to gas her up if she's your DD
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