3.55 or 3.73 - Mustang Evolution

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Old 06-17-2012, 11:09 PM   #1
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3.55 or 3.73

how much of a different are the gears anyone have experiences with them ?
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Old 06-17-2012, 11:29 PM   #2
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Quote:
Originally Posted by geepoons
how much of a different are the gears anyone have experiences with them ?
Mine had 3.73's when I bought it. Mach1's came w/3.55's stock. As far as performance, I can't compare. It has been documented to run 1700RPM at 60MPH. Mine is running around 1850RPM. There is not a big difference between these gear sets. I've been happy with them
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Old 06-18-2012, 06:40 AM   #3
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No direct comparison experience. I test drove a GT with 3.55s, and it was pure awesome. I put 3.73s in my V6, and it's pure awesome

Not sure if someone has the calculations that will allow you to estimate gas mileage, but the 3.55s and 3.73s are really close. When you consider that stock is 2.73, both are big jumps. Psychologically, you might want to get 3.73s though.

4.10s will blow your MPGs to hell.
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Old 06-18-2012, 06:48 AM   #4
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I can't give any proven documentation but I had 3.55 and now I have 3.73s and it felt like the 3.55 would stretch a little bit more then 3.73s, not by much but I like the 3.73s better but that's just me. Hope that helps a little.
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Old 06-18-2012, 07:48 AM   #5
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I'm averaging 18MPG since I bought it back in February. That's with spirited driving and not much highway time.

Attachment 55270

The dips you see in the graph are weeks where I visited the local track.
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Old 06-18-2012, 08:29 AM   #6
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Re: 3.55 or 3.73

3.55 vs 3.73 is a very little difference~ wouldnt be worth the hassle.

percentage wise its very little
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Old 06-18-2012, 09:29 AM   #7
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Originally Posted by SpectorV
3.55 vs 3.73 is a very little difference~ wouldnt be worth the hassle.

percentage wise its very little
So, if he's thinking about upgrading, which would you recommend?
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Old 06-18-2012, 05:40 PM   #8
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Quote:
Originally Posted by illestdomer2005

So, if he's thinking about upgrading, which would you recommend?
IMO if there is not much deference in the performance aspect and the 3.55 will give a little lower RPM at cruising speed that would mean a little better gas mileage.

Myself I'm getting the 3.55 next spring.
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Old 06-19-2012, 07:20 AM   #9
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Originally Posted by FastV6

IMO if there is not much deference in the performance aspect and the 3.55 will give a little lower RPM at cruising speed that would mean a little better gas mileage.

Myself I'm getting the 3.55 next spring.
Yeah, I think it's an individual choice. Performance gains are probably the same as MPG gains. Psychologically, I went with the 3.73s for the reason.
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Old 06-19-2012, 11:52 AM   #10
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Doesn't anything over the 3.31 gears require a tune?
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Old 06-19-2012, 12:04 PM   #11
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With the t3650 trans the 3.55 will get you across the quarter mile at the top of third 6000rpm 98mph ish. 7000rpm 110mph (my mach). The 3.73 will need a shift to fourth. At those speeds. Something to keep in mind.
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Old 06-20-2012, 05:40 AM   #12
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Doesn't anything over the 3.31 gears require a tune?
Yep! I mean, they all require a tune, but anything beyond 3.31 exceeds what Ford allowed for in stock parameters. Dealership can try to compensate by also adjusting your tire settings, but there is no stock option for anything over 3.31.
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Old 06-20-2012, 06:16 AM   #13
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Originally Posted by MedicDave
I can't give any proven documentation but I had 3.55 and now I have 3.73s and it felt like the 3.55 would stretch a little bit more then 3.73s, not by much but I like the 3.73s better but that's just me. Hope that helps a little.
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Old 06-20-2012, 10:53 AM   #14
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I have 4.10's in my dd. Gas mileage is about 24 hwy. Love the 4.10's.
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Old 06-20-2012, 11:00 AM   #15
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I have 4.10's in my dd. Gas mileage is about 24 hwy. Love the 4.10's.
Dayum! I may have to invest in some of these.
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Old 06-20-2012, 11:07 AM   #16
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I drive 4.10s in my DD and get about 20 mixed mpg typically in my '02 GT 5speed. But I do drive pretty hard..

I love 4.10s. Anything is better than the stock 3.27s.
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Old 06-20-2012, 11:18 AM   #17
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Yes but in a 99-04 they are freakin sweet. Idk about these newer ones. I thought the 3.73 was enough for it being a new tranny and setup.
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Old 06-20-2012, 07:25 PM   #18
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Quote:
Originally Posted by illestdomer2005
No direct comparison experience. I test drove a GT with 3.55s, and it was pure awesome. I put 3.73s in my V6, and it's pure awesome

Not sure if someone has the calculations that will allow you to estimate gas mileage, but the 3.55s and 3.73s are really close. When you consider that stock is 2.73, both are big jumps. Psychologically, you might want to get 3.73s though.

4.10s will blow your MPGs to hell.
It depends on how you drive, if you love that kick and the sound of your exhaust then they will go down the toilet, but of you are easy with it and do mostly city driving you may actually see an increase in mileage. If you do highway driving then you will lose just a few mpgs
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