Finally pulled the trigger on some 3.55s!! - Mustang Evolution

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Old 09-29-2015, 04:29 PM   #1
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Finally pulled the trigger on some 3.55s!!

Ordered a set of 3.55s yesterday! Can't wait for them to arrive. I already talked to a local shop who is known for working on the 8.8s and quoted me $350 for install and can get me in next week!

I did a lot of research when deciding which gear to choose, and it came down to 3.55s and 3.73s (seems to be a highly debated topic). I live just outside the city and do a decent amount of highway driving so that was a big deciding factor. Also, I've read a few others have mentioned that the 3.55s redline in 3rd gear right at the end of the quarter mile so I will only have to shift twice instead of 3 times if I went with 3.73s. I will eventually go turbo/supercharged so the shallower gear seemed to be a better choice in the long run.

Either way, there is such a minimal difference between the two I figured I can always change the size of the tire if it's too much or too little gear. After this, there's not much more I can do except some Forced Induction!!
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Old 09-29-2015, 05:17 PM   #2
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Same here. I decided to go with the 3.55 because of possibly going FI. The highway mileage is not too awful bad unless your cruising at 75-80.

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Old 09-29-2015, 05:22 PM   #3
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What gears did your car come with?


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Old 09-29-2015, 06:39 PM   #4
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What gears did your car come with?


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It's not the PP so they come w 2.73s stock. Boringggg!
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Old 09-29-2015, 06:52 PM   #5
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It's not the PP so they come w 2.73s stock. Boringggg!

Ok just making sure you didn't have the 3.31 option. If you did I would tell you to save the money and return the gears.


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Old 09-29-2015, 07:26 PM   #6
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Ok just making sure you didn't have the 3.31 option. If you did I would tell you to save the money and return the gears.


🍼and 🌽 fed coyote.

Lol yeah I know. Thanks for lookin out.
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Old 09-29-2015, 07:49 PM   #7
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you're going to love the 3.55s. We have a 27" tire on our car, which is a hair shorter than stock and makes first gear pretty short, but its an awesome combination on a standard. Assuming you have a standard. If you have an auto you'll be happy with either 3.55 or 3.73.
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Old 09-29-2015, 08:35 PM   #8
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I'm very happy with my 3.73's, but I learned some lessons when they were installed. Be sure to tell your installer to check ALL the bearings while the differential/axles are visable. Eliminate ANY reason for the "whine" (which will be caused by an inaccruate installation if all the bearings have been checked and/or changed). Having that agreed upon before the work is done will save you a lot of headaches if there's a problem. Good luck, and you will enjoy the performance improvements.
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Old 09-29-2015, 10:15 PM   #9
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Finally pulled the trigger on some 3.55s!!

Volt - yes I have a standard trans. Can't wait!

Ted - I talked to the installer who recommended not getting the rebuild kit with all the seals and bearings he said just get the rear pinion bearing because I have only 15k on her. He said everything is just starting to break in. Also said he will stand behind the work if anything goes wrong. I will still ask him to check everything though while he's in there. Thanks for the heads up.
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Old 10-01-2015, 08:54 PM   #10
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I went from 2:73s to 3:55s as well. One of the best performance mods. Made such a big difference I am glad I swapped gears a couple of months after buying the car. So much more fun.
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Old 10-08-2015, 09:59 AM   #11
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I also researched the 3.55 vs 3.73 for months. Decided that 3.55 was the way to go since the difference between the two is small and I'd prefer the slight help in mpg vs slight performance bump between the two. Local mechanic quoted me $300 and recommended I get the full install kit even though my car has ~6k miles. Let us know how you like them and if you've got any issues with traction! I have a 2014 premium convertible Auto and agree that the stock 2.73 gears leave a lot to be desired. Getting mine done once I pull the trigger within the next couple of months.
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Old 10-08-2015, 10:15 AM   #12
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I also researched the 3.55 vs 3.73 for months. Decided that 3.55 was the way to go since the difference between the two is small and I'd prefer the slight help in mpg vs slight performance bump between the two. Local mechanic quoted me $300 and recommended I get the full install kit even though my car has ~6k miles. Let us know how you like them and if you've got any issues with traction! I have a 2014 premium convertible Auto and agree that the stock 2.73 gears leave a lot to be desired. Getting mine done once I pull the trigger within the next couple of months.

Nice! I have my appt for this Wednesday. Then off to the track next weekend!
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Old 10-08-2015, 11:25 AM   #13
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I'm thinking 3.55 would be the way to go with these V6's. Mine came with 3.31 (yes I did try 2.73's) and 3rd gear is the bomb but it does top out higher than I drive on the street. I'm thinking with the 3.55 you would have better grunt down low and have the upper range of 3rd still high enough to make 2 lane blacktop passing moves a hoot.
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Old 10-09-2015, 11:44 AM   #14
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I average 25 mpg with my 3.55's
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Old 10-09-2015, 11:57 AM   #15
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I average 25 mpg with my 3.55's

I average 20 mpg! What other mods do you got?
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Old 10-09-2015, 12:37 PM   #16
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I average 25 mpg with my 3.55's
25 mpg highway? Sounds about right with your setup. Now, if that's 25 mpg mixed then you've got one fuel efficient 'stang. I average ~20 mpg with my 2.73 due to all the intown driving (lots of hills by me) - highway is around 29 mpg. Hoping the 3.55 will bump that up to at least 21 mixed without bringing the highway lower than 27 if I baby it a bit.
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Old 10-09-2015, 04:12 PM   #17
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Now this is interesting. When i got my car it had 2.73s. My dad had a GT500 with 3.31s and when he got it Super Snaked they removed them, so one weekend we installed the 3.31s at shop my uncle has in LA. Now Im considering 3.73s, but from what im seeing posted on here it sounds like 3.55s are the way to go? I've never and dont intend to do any major or regular drag racing but i do want a quick punch when i get on it and would prefer a quicker accel than what i have with the 3.31s
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Old 10-09-2015, 05:51 PM   #18
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If you have 3.31s its not worth going to 3.55s. I went from 2.73s to 3.73s and couldn't be happier, that being said I've also had seat time with 3.55s and wouldn't have been disappointed with those either. Id rather a bit better bite off the line and lose a bit on the highway mpg.

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Old 10-09-2015, 06:53 PM   #19
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Correct, you will not see much of a difference going from . 3:31 to 3:55. With my setup, auto convertible premium with 18 in GT rims and tires, Steeda 91 tune and 3:55, I already have traction issues. 3:73 would give more punch but it would have greater traction problems. Suppose the next step would have to be LCA and wider or stickier tires.
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Old 10-10-2015, 06:44 AM   #20
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Correct, you will not see much of a difference going from . 3:31 to 3:55. With my setup, auto convertible premium with 18 in GT rims and tires, Steeda 91 tune and 3:55, I already have traction issues. 3:73 would give more punch but it would have greater traction problems. Suppose the next step would have to be LCA and wider or stickier tires.
Wider stickier tires. LCA keep you from getting as much "wheel hop" when you do cut the tires loose.

Ok then , so since I have 3.31s already, going to 3.55 isn't worth it, what about 3.73s? I do have a 6 speed btw so I know that the gearing in the transmission is a bit different than in autos.
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Old 10-10-2015, 04:31 PM   #21
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With a stick and 3:31s, your best options for gears are either 3:73s or remain with your existing gears. I would go with the 3:73s. The 2:73 are worthless for performance. The 3:31s are a minimum. 3:55 or 3:73 are the best ratios for our cars. You will enjoy the added fun factor!
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Old 10-10-2015, 04:35 PM   #22
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Im considering it, got a shop that can provide parts and install for $500...just need the extra $500...but ive been hearing a few guys on here that have been having issues after installing them..could just be small install issues or what not but it still worries me...last thing i need is rear end issues with my car lol
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Old 10-10-2015, 04:46 PM   #23
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Unless it was a buddy I wouldn't go from 3.31 to 3.55. I hear too many horror stories. I've only driven the 2.73 and 3.31 but 3.55 would be great (I think) it's about a 10% change from the 3.31 which would bring the top of 3rd to 80+ but drop down the speed where it becomes fun to 35? or so. I like the 3.7 engine but anything below 2k and it sucks and as folks that have one know over 3500 is when it starts to be fun. I wonder how useable 1st is with 3.73's it goes through it quickly enough now.
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Old 10-10-2015, 04:52 PM   #24
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I hear ya. I had the best shop in town do the install. I provided the Ford Racing gears (not the Motive) ones. Install went great. No noise or issues. Replaced the fluid after about 1, 000 miles. Then after 8 months or so, I started hearing a grinding noise when I would make turns in the morning. Would get better after a few miles. Took the car back and had them add a second bottle of additive. No more noise.
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Old 10-11-2015, 07:34 AM   #25
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Unless it was a buddy I wouldn't go from 3.31 to 3.55. I hear too many horror stories. I've only driven the 2.73 and 3.31 but 3.55 would be great (I think) it's about a 10% change from the 3.31 which would bring the top of 3rd to 80+ but drop down the speed where it becomes fun to 35? or so. I like the 3.7 engine but anything below 2k and it sucks and as folks that have one know over 3500 is when it starts to be fun. I wonder how useable 1st is with 3.73's it goes through it quickly enough now.
I know right Mud. It's not to bad at 2k in 3rd but 2nd at 2k is lousy.
I wonder the same thing about the 1st gear with 3.73s.





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I hear ya. I had the best shop in town do the install. I provided the Ford Racing gears (not the Motive) ones. Install went great. No noise or issues. Replaced the fluid after about 1, 000 miles. Then after 8 months or so, I started hearing a grinding noise when I would make turns in the morning. Would get better after a few miles. Took the car back and had them add a second bottle of additive. No more noise.
Thats interesting to know
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Old 10-11-2015, 09:15 AM   #26
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I use first all the time, absolutely still usable. That being said if you start out in second its like having 2.73s as your first gear.

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Old 10-11-2015, 12:13 PM   #27
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Oh thats awsome... well then i think the 3.73s will be the go to gear for me...
im sorry OP didnt mean to thread jack. Just saw this and started getting me thinking of other options...
Speaking of other options...has anyone tried anything between 3.73 and 4.10. Does that even exist?
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Old 10-11-2015, 12:25 PM   #28
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They have 3.90s but they are not ford racing gears. I'm not sure I've seen anyone here run those though.

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Old 10-11-2015, 12:32 PM   #29
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I hear ya. I had the best shop in town do the install. I provided the Ford Racing gears (not the Motive) ones. Install went great. No noise or issues. Replaced the fluid after about 1, 000 miles. Then after 8 months or so, I started hearing a grinding noise when I would make turns in the morning. Would get better after a few miles. Took the car back and had them add a second bottle of additive. No more noise.
Interesting that's probably what I'm hearing in mine, so they just add the additive and the noise went away? Do they have to change all the gear oil as well? What kind of noise you were hearing before? I had the feeling when they changed the bearing and pinion seal they didn't put the additive when they put gear oil back on it.

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Old 10-11-2015, 12:49 PM   #30
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The noise was the clutch packs "grabbing". I could hear and feel it, mostly during sharper turns early in the morning when the fluid was still cold. They drained just enough fluid to add the bottle of additive.
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Old 10-11-2015, 01:47 PM   #31
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The noise was the clutch packs "grabbing". I could hear and feel it, mostly during sharper turns early in the morning when the fluid was still cold. They drained just enough fluid to add the bottle of additive.
Mine is auto, I don't feel any vibration just the annoying hollow sound but it goes away when I'm in the hi way maybe my exhaust hides it a bit.. Thanks man glad you got yours sorted out easily.

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Old 10-11-2015, 02:17 PM   #32
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You're right about it being annoying. The rear end noise combined with the front end making noises over every speed bump and dip made the car feel like an old junky pick up.
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Old 10-11-2015, 08:10 PM   #33
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Why would you change fluid after a gear change? You don't change fluid after buying a new vehicle until the recommended interval.
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Old 10-12-2015, 07:34 AM   #34
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$500 seems very reasonable if they're providing the gears, shims, and oil. Do you have a tuner? If you don't, don't forget to factor in the cost of a tune. You could always just get a speedo adj gear so your spedometer is correct since you drive stick, but a tune will provide an overall benefit to the car that would complement the gears very nicely. You could always try a few tunes with your 3.31s and see if they perform more to your liking before taking the plunge to the steeper gears.
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Old 10-12-2015, 09:31 AM   #35
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Why would you change fluid after a gear change? You don't change fluid after buying a new vehicle until the recommended interval.
It was recommended by the shop. Plus, I read other posts on here suggesting to perform the fluid change. One of the reasons was to flush out an metal particles that the gears may produce.
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