Need gear advice... - Mustang Ecoboost Forum
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post #1 of 5 Old 02-18-2018, 02:43 PM Thread Starter
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Need gear advice...

I'm looking for information about what rear end gear works well. I have the 3:10 that comes stock. Performance package is 3:55. Has anybody put in a 3:73? I need to drive this car quite regularly, but I do drag race and autocross and am looking for better acceleration. Anybody have any thoughts?
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post #2 of 5 Old 02-19-2018, 07:41 AM
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I believe the stock rear end ratio for the Ecoboost is 3.31, not 3.10.

It's up to you man. You have 3 upgrade choices available. 3.55, 3.73, or even a 4.09. You never said what transmission you had which will make a difference because the ratios in the A/T are a bit different than the M/T. Wheel/tire size will also impact final drive ratios. Personally if you are not turning your car into a dedicated 1/4-miler I wouldn't go any lower than the 3.55's. The 3.55's will definitely get you up and going a bit quicker than the 3.31's.

A/T Gear ratios
1 - 4.17:1
2 - 2.34:1
3 - 1.52:1
4 - 1.14:1
5 - 0.87:1
6 - 0.69:1

M/T gear ratios
1 - 4.236:1
2 - 2.538:1
3 - 1.665:1
4 - 1.238:1
5 - 1.00:1
6 - 0.704:1

U.M.

2016 Ecoboost Mustang
2009 C6ZO6
2005 Mustang V6 (Sold)
2003 Terminator (Sold)
2002 Mustang GT (Sold)
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post #3 of 5 Old 02-19-2018, 10:02 PM Thread Starter
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whoops.... Manual Transmission and 3:31. Thanks for the info. Was wondering what people who had an actual non-stock gear in the ecoboost mustang thought...
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post #4 of 5 Old 02-20-2018, 04:44 AM
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Quote:
Originally Posted by Barry View Post
whoops.... Manual Transmission and 3:31. Thanks for the info. Was wondering what people who had an actual non-stock gear in the ecoboost mustang thought...
I'm sure there are a few owners out there who have swapped out the their stock ring & pinion for a lower ratio set, but I'm not aware of anyone on these forums who's done this yet.

U.M.

2016 Ecoboost Mustang
2009 C6ZO6
2005 Mustang V6 (Sold)
2003 Terminator (Sold)
2002 Mustang GT (Sold)
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post #5 of 5 Old 02-22-2018, 11:28 PM Thread Starter
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That's what I'm finding out. I'm leaning towards 3:55. Ford spec'd it in the performance pack for a good reason. UNLESS someone out there can convince me otherwise ?
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