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Old February 17th, 2007, 09:52 AM   #1
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Gear Ratios


I just purchased the rear for my mustang project, an 8.8" with 3.55's. Has anyone here gone up to 3.73's from this size gear? is it worth spending the extra money or should I just keep the 3.55's?
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Old February 17th, 2007, 10:19 AM   #2
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For the money I'd stick with the 3.55's. For the street I really don't think a gear change is noticeable unless it's by 0.5 or more.
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Old February 17th, 2007, 03:27 PM   #3
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What is your car's main application?

Is it going to be an all-time street car for a daily driver?
if so then stick with the 3.55's

If you plan on taking it to the track every once in a while or showboating a bit then I would personally buy the 3.73's, see if you like them but still keep the 3.55's. if you do like them then you can sell your 3.55's or vice versa if you dont then re-sell the 3.73's

I use 3.73's on my 88 GT and I like it but I have never driven with 3.55's so I cant make an actual comparison, sorry.
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Old February 19th, 2007, 09:34 PM   #4
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can i ask where you purchased this rear end?L i need one for my project!
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Old February 19th, 2007, 10:21 PM   #5
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it is not worth it unless you step up at least two gear sizes
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Old February 19th, 2007, 10:24 PM   #6
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Originally Posted by Racinjason81
it is not worth it unless you step up at least two gear sizes
That all depends on the combination.
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Old February 19th, 2007, 11:26 PM   #7
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3.55s are fine but I dont think you would feel much of a difference if you only move up one size. either get 4.10 or stick with 3.55s either way a hell of a lot better than 2.73s
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Old February 20th, 2007, 02:08 AM   #8
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I've got 3.73 in my '89 and I love it! I find it to give plenty of power and i have no complaints. to be honest with you i have never driven on 3.55 so i don't know about those.
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Old February 20th, 2007, 10:18 AM   #9
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Sounds like the 3.55's are the better choice. I'll see how I like them, i can get ahold of a set of 4.11's if I decide to step up the size a bit.
I bought the rear end from a friend of mine for 20$, however it needs to be retubed. but the gears and pumpkin are fine, and so are the 5-lug axles.
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Old February 20th, 2007, 12:06 PM   #10
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I always liked 4.10 for aod and 3.73 for sticks
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Old March 6th, 2007, 03:49 AM   #11
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As for the gears, I gots 3.73's and I want 3.55's. Twistin 3K at cruise speed is not conducive to keepin a low profile. Especially with no cats and 40 series flowmasters and dumps...
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Old March 6th, 2007, 04:01 AM   #12
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Originally Posted by homebrewed
As for the gears, I gots 3.73's and I want 3.55's. Twistin 3K at cruise speed is not conducive to keepin a low profile. Especially with no cats and 40 series flowmasters and dumps...
In what car? T5? What size tires? Info, man!
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Old March 6th, 2007, 09:43 AM   #13
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alright fools i deleted his CAPS that seemed to piss everyone off and re-did it in lowercase so you all can stop bitching now. anyways as far as 3.55s to 3.73s you arnt going to notice much but it depends on your set up. if its a race car and you need that extra little bit more to get you through the traps at the right RPM then go for it but if its just a street toy I doubt you will see much of a difference. If you want a noticable diffrence put 4.10s in it i have them and love them.
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Old March 6th, 2007, 11:28 AM   #14
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'88 body, '91 drivetrain. Started out as a 4cyl w/ 7.5 rearend. Now its a 306, T-5, 8.8 diff. Tires are 245/45R17 at all 4.

?Happy? lol
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Old April 19th, 2007, 01:57 PM   #15
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I know this is an older post, but I have a question and felt it was better to use this post than to start a new one.

The car (1990 GT) I am thinking about getting has 3.08 gears in the back with a T5 tranny. One of the first things I want to do is replace those 3.08 gears with something else.

Now, the car will be used as a daily driver, but it will also be used as an AutoCross car on weekends. I am not really interested in drag racing. So, here is my question, which gear ratio would suite me better? 3.55's or 3.73's? And why?

Thanks
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Old April 19th, 2007, 09:36 PM   #16
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3.73's all the way..deff...
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