Rear end gear ratios - Ford Mustang Forum
 
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post #1 of 12 (permalink) Old 07-16-2010 Thread Starter
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Rear end gear ratios

I'm going to be buying a 2011 5.0 soon and have a question. What are peoples experiences with the 3.31, 3.55 and 3.73 rear end gears? My car will be mostly used for daily commuting (roughly 40 miles round trip) so I'd like to get decent milieage but also want great off the line acceleration. Is there that much of a difference between the performance and mileage of the 3.31 and 3.73 gears? Should I just go with the middle of the road 3.55 for the best compromise? Any information anyone has would be much appreciated. Thanks

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post #2 of 12 (permalink) Old 07-16-2010
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Dude, get the 3.73's. The diff in gas mileage will not be much when you are driving her easy.

If you get anything lower than 3.73's, everytime you hit the gas you are going to wish and wonder what those 3.73's feel like.


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post #3 of 12 (permalink) Old 07-16-2010
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I think the 3.73 would be the best choice. I'm no expert but it seems to me that the increase in effective torque applied to the rear wheels should result in better driveability without hurting hwy gas economy and probably give better city gas ecomony.
I don't know about the '11 w/ the 6 spd tranny but a 5 spd 4.6 turns about 2000 rpms @ 70 mph in 5th w/ 3.31 gears and about 2253 rpms w/ 3.73 gears.
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post #4 of 12 (permalink) Old 07-16-2010
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I have the 3.31's on my '11 GT, they are plenty fast but do leave me wondering about the 3.73. Anyone know how much faster the 3.73's are in a 0-60 than the 3.31's?

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post #5 of 12 (permalink) Old 07-16-2010
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I have 3.73's, and I get 24-26 round trip between here and Helena. For clarification, Helena is about 90 miles from great falls. goes through mountains, and my cruise control was set at 80 mph since the speed limit is 75. And I spent probably 10 miles in Helena (went to ihop ). I've done it twice, to the same ihop, got the same numbers. In town, my mileage is insane if I drive really nice. Like, well into the 30's nice. In other words, get the 3.73's.

Edit: I lied, going TO Helena, I took the twisty side road that covers the middle 30-40 miles or so. Doing about 65 the whole time.

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post #6 of 12 (permalink) Old 07-16-2010
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When I had my 99 GT vert 5-speed with 3.31's I would get about 18-19 MPG with my normal commute.

My 2010 with a more powerful engine and 3.73's gets 22-23 MPG on the same route. I think what helps me in the city the most is the lower gears. I can shift sooner, and use 4th gear at 25MPH Vs. having to use 3rd in my 99.

I would get 25MPG with my 99 on the eway doing 70MPH @ 2000 RPM. I have yet to have my 2010 on the eway enough to get a good average.

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post #7 of 12 (permalink) Old 07-16-2010
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Quote:
Originally Posted by Mustang Airman View Post
When I had my 99 GT vert 5-speed with 3.31's I would get about 18-19 MPG with my normal commute.

My 2010 with a more powerful engine and 3.73's gets 22-23 MPG on the same route. I think what helps me in the city the most is the lower gears. I can shift sooner, and use 4th gear at 25MPH Vs. having to use 3rd in my 99.

I would get 25MPG with my 99 on the eway doing 70MPH @ 2000 RPM. I have yet to have my 2010 on the eway enough to get a good average.
I am in 5th at 25, 6th at 30. Without lugging.

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post #8 of 12 (permalink) Old 07-16-2010
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I would put a set of 4.10's in it, after your first 1,000 miles you'll notice a big difference and it won't hurt your fuel economy, Mike.

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post #9 of 12 (permalink) Old 07-16-2010
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The 3.73 option is a must for the 5.0. You will not regret it.
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I can't speak for the 3.31 or the 3.55 because I didn't test drive either of them, but I love the 3.73 that's in mine!

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I am getting the 3.73 LS rearend
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get the 3:73's you will NOT regret it ever
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