Gear Questions for 2013 3.7L - Mustang Evolution

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Old 08-05-2013, 12:47 PM   #1
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Gear Questions for 2013 3.7L

I have a 2013 3.7L MT, and I really want to change out my stock 2.73 gears. At first I was set on 3.31, but someone said its not worth it and to go 3.55 or 3.73. So my (probably stupid) questions are:

for each gear (3.31, 3.55, 3.73):

What are the effects on performance?
What are the effects on MPG?
What are the RPM differences at different cruising speeds (say 40/50/60/70)?
For those who have upgraded, what speeds are you shifting at?


Thanks!
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Old 08-05-2013, 12:52 PM   #2
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AM has a guide for the gear changes.
You will notice a drop in MPG as you will be at a higher RPM in any given gear for the same speed.
I was going to go 3.55 and will instead go to 3.31 for warranty purposes only. I have an automatic and gearing is different from the MT. It's a wider ratio.

It's been covered extensively. Search will yield MUCH better results than my limited memory.
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Old 08-12-2013, 01:08 PM   #3
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Originally Posted by GBMustang13 View Post
I have a 2013 3.7L MT, and I really want to change out my stock 2.73 gears. At first I was set on 3.31, but someone said its not worth it and to go 3.55 or 3.73. So my (probably stupid) questions are:

for each gear (3.31, 3.55, 3.73):

What are the effects on performance?
What are the effects on MPG?
What are the RPM differences at different cruising speeds (say 40/50/60/70)?
For those who have upgraded, what speeds are you shifting at?

Thanks!
I got 3.55s
Performance is day and night!!!!!!
Mpg is about the same (all city)
It dropped on the highway, but I managed 25 mpg @ 85 mph
@40 I'm at 2k in 5th
@50 I'm at 1.6ish in 6th
@60 I'm right at 2k
@70 I'm just under 2.5k
Cruising at 100, Im at 3.1k rpm
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Old 08-12-2013, 01:11 PM   #4
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Thanks, alrefire, that helps a lot. who did your gear install?
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Old 08-12-2013, 01:21 PM   #5
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Thanks, alrefire, that helps a lot. who did your gear install?
I drove an hour east to Killin, AL
Find someone who's actually done it before :p
Ask a local mustang club.
I payed 225 for labor and a new bearing.
I provided gears and fluid
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Old 08-12-2013, 01:39 PM   #6
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Posting to subscribe. But also!!!! I heard that if you get ford racing parts and have them installed at a ford dealer, it does NOT void your warranty. I would research that further with a more official source, but ive seen ford racing gears as low as 4.10 for the v6.
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Old 08-12-2013, 01:46 PM   #7
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Posting to subscribe. But also!!!! I heard that if you get ford racing parts and have them installed at a ford dealer, it does NOT void your warranty. I would research that further with a more official source, but ive seen ford racing gears as low as 4.10 for the v6.
Funny story about the dealer and gear swaps. The dealer that I bought my mustang from refuses to do it, because they tried on someone else's and screwed up so bad they had to buy him a new rear end. Another dealer about 30 minutes from me will do it, and they said they warranty their gear work for 12 months. They didn't mention anything about voiding the factory warranty though. I'll have to check on that. They did quote me $700-$800 for parts & labor though.
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Old 08-12-2013, 01:54 PM   #8
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Yea, no doubt you'll get raped for labor, but if you can keep the warrenty (again i have no hard evidence just what i heard) itd be worth it.
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Old 08-12-2013, 01:55 PM   #9
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That's kinda what I was thinking too. I can do intake, exhaust, etc... but I'd rather not mess around with gears.
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Old 08-12-2013, 02:20 PM   #10
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That's kinda what I was thinking too. I can do intake, exhaust, etc... but I'd rather not mess around with gears.
I should done gears as my first mod. You will not regret it
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Old 08-12-2013, 02:39 PM   #11
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I should done gears as my first mod. You will not regret it
So looking forward to my gears!!!
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Old 08-13-2013, 02:03 PM   #12
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On a track, even with 295 (11 inch tires) and 3.55, the traction problems are hell. Also a race tune and LCA. Just saying.
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Old 08-13-2013, 02:56 PM   #13
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On a track, even with 295 (11 inch tires) and 3.55, the traction problems are hell. Also a race tune and LCA. Just saying.
That's actually 5mm from 12 ft

---------- Post added at 02:56 PM ---------- Previous post was at 02:55 PM ----------

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On a track, even with 295 (11 inch tires) and 3.55, the traction problems are hell. Also a race tune and LCA. Just saying.
But that was with 36 psi :p
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Old 08-14-2013, 11:44 PM   #14
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I got 3.55s on an auto and the performance is a huge difference.

Still averaging 25-27 highway between 70-80 right about 2000-2100.

At 65 getting about 28-29 and around 1900 so good luck!
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Old 08-15-2013, 06:30 AM   #15
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3:73 all the way! Love mine! Around 2300 rpm's at 70 mph. 65 mph getting 29 mpg.
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Old 08-15-2013, 06:48 AM   #16
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So, who told you 3:31 "is not worth it"? There are many out there with this ratio, including mine which suits my driving just fine.

I'll assume those who think its not worth it to go with a 3:31 are those who rarely see highway use, or are more of a traffic light to traffic light type driver.
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Old 08-15-2013, 06:56 AM   #17
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My local Ford dealer did my gears for $550 labor.
Every Ford dealer i talked to in my area would do my gears. I wouldn't let a Ford dealer who told me they could't do a gear change, change a light bulb in my Mustang. just saying..............
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Old 08-15-2013, 06:08 PM   #18
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JMO, and I like to drag race. For topping out 3rd gear in an auto without shifting again, 3.55's ...maybe 3.73's with a taller tire. For a manual, 3.73's all the way.

Me, I wanted more rpms and to trap in 4th gear. 4.30's will work best with a 26" slick there. I run 2600 at 70mph on the stock 235/50/18's.
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Old 08-21-2013, 12:13 PM   #19
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3:73 all the way! Love mine! Around 2300 rpm's at 70 mph. 65 mph getting 29 mpg.


What the heck?!?! I don't even get that and I still have stock 2.73 gears....How the heck is that possible
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Old 08-22-2013, 12:30 AM   #20
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Quote:
Originally Posted by GBMustang13 View Post
I have a 2013 3.7L MT, and I really want to change out my stock 2.73 gears. At first I was set on 3.31, but someone said its not worth it and to go 3.55 or 3.73. So my (probably stupid) questions are:

for each gear (3.31, 3.55, 3.73):

What are the effects on performance?
What are the effects on MPG?
What are the RPM differences at different cruising speeds (say 40/50/60/70)?
For those who have upgraded, what speeds are you shifting at?


Thanks!
i went 3.55 and there just right
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