View Poll Results: Correct Rear Axle

3.31 vs 3.73 for 2015 Mustang

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Rear Axle Questions

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What rear axle is right

Voters: 2. You may not vote on this poll

2015 GT Manual Rear Axle

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3/29/15 | 01:21 PM

#21

kponypower

GT Member

Joined: March 29, 2015

Posts: 108

Likes: 2

From: indiana

I am NEW member and buying my 3rd. mustang in my life's cycle. 1970 Mach1, 1986 GT and now my 2015 GT. But I am reading these post and am in the same state of wondering. The car has 3:31 std. gear and I assume it is designed to give matched with the hi performing 5.0L to give balanced performance in 6 gears with a nice top end. But if one wants slightly more low end performance but doesn't want the higher geared 3:73 I am wondering if the 3:55 is a middle of the road compromise. I assume the 3:31 is best matched for performance but allowing decent MPG and the 3:55 will reduce the MPG a little and the 3:73 will give good torque and low gear take off power but again for over the road the car will wine and 70 for example with a higher RPM to attain 70 because of the higher gear ratio. Or say it another way the 3:31 at 70 will run at a slightly lower RPM. Is my thinking correct???
I say a poster somewhere said a 3:55 would increase MPG say In 6th.. Someone straighten me out before I buy this week please !!!

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3/29/15 | 01:25 PM

#22

kponypower

GT Member

Joined: March 29, 2015

Posts: 108

Likes: 2

From: indiana

Quote:

Originally Posted by dwlow09

There's a spot on the door that's has a double letter like GG DD or whatever if it says GG you have the 3:31 gears. I just bought mine 2 weeks ago and traded in a 2014 GT base model with nothing on it except 3:55 gears. I liked the 355's but don't care much for the 331's on new one. With the 3:31's you should be able to get up to like 45 mph fully wound out in 1st and 68 in 2nd to if you had 355 it'd be 42mph in 1st and 63 in 2nd. If you had 3:73's it'd be 40 in 1st and 60 in 2nd. Search the internet and you can find the list of gear ratio's and speed of each gear.

See my post on the 2nd. pg. of this topic. Iam glad I joined this forum. I think for my interest for me the 3:55 is a good compromise! Thoughts??

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3/29/15 | 03:06 PM

#23

m05fastbackGT

SUPERCHARGED RED ROCKET ------------------Master-Moderator

Joined: May 11, 2006

Posts: 10,390

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From: Carnegie, PA

Quote:

Originally Posted by kponypower

See my post on the 2nd. pg. of this topic. Iam glad I joined this forum. I think for my interest for me the 3:55 is a good compromise! Thoughts??

If your looking for that balance between better low end performance without sacrificing fuel economy ? I would recommend going with the 355:1 gear ratio over 373:1 anytime..

The 355's IMO provide the perfect balance between the 331:1 and 373:1 ratio's for best overall low end performance without sacrificing MPG efficiency

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3/29/15 | 04:32 PM

#24

kponypower

GT Member

Joined: March 29, 2015

Posts: 108

Likes: 2

From: indiana

That's what I wanted to hear OR read! I figure it is in the middle. so a win win!

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3/16/16 | 08:47 PM

#25

jspencer7734

Member

Joined: March 16, 2016

Posts: 1

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Quote:

Originally Posted by boomer46

Harley, could you define "2nd gear for easy start offs". I'm getting ready to order a 2015 GT w/the PP next month. Can you start off from a dead stop in 2nd gear with yours (in that 1st gear is pretty much a granny gear), or by easy start offs, do you mean you're still rolling?? Just curious. I'm not convinced on the PP as yet & can't drive one til I get back down to the lower 48 right before I order one. Thx in Advance. Dennis

I have a 2015 gt with PP and I start off, from a stop, in 2nd gear all the time. Also, to keep from Jenkins my mom's head everytime I shift I also go from 2nd to 4th to keep a smooth acceleration and also improve the gas mileage as much as possible because when I'm driving alone I strive for the worst gas mileage I can get, lol

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