Central 20 - 3.9 Final Drive
Joined: Feb 2006
Posts: 13,068
Likes: 101
From: Southern Cali --> 818
Originally Posted by Chrlesmd
Anyone do this on a 5AT? Impressions?
Going from the stock 3.3 to 3.9 is unheard of for AT's.
I think it's an excellent mod for an AT.
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Joined: Feb 2006
Posts: 13,068
Likes: 101
From: Southern Cali --> 818
Originally Posted by 2EFNFAST
How did you account for the odo/speedo being 10% off - new gear, ecu reflash, etc....?
Speedometer is not going to be 10% off. That has nothing to do with it.
And I don't see how an ECU reflash would be beneficial toward the new FD.
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Registered User
Joined: Jan 2007
Posts: 155
Likes: 0
Originally Posted by skaterbasist
Speedometer is not going to be 10% off. That has nothing to do with it.
And I don't see how an ECU reflash would be beneficial toward the new FD.
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I went with 4.10s in my mustang, never bothered to reflash the ecu, and was off by like 15%
Joined: Feb 2006
Posts: 13,068
Likes: 101
From: Southern Cali --> 818
Originally Posted by 2EFNFAST
if the gearing is changed the speedo/odo isn't going to be right anymore.....I know some cars, for example, need a new speedo gear or else the speedo/odo will be off
I went with 4.10s in my mustang, never bothered to reflash the ecu, and was off by like 15%
I went with 4.10s in my mustang, never bothered to reflash the ecu, and was off by like 15%
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Originally Posted by 2EFNFAST
if the gearing is changed the speedo/odo isn't going to be right anymore.....I know some cars, for example, need a new speedo gear or else the speedo/odo will be off
I went with 4.10s in my mustang, never bothered to reflash the ecu, and was off by like 15%
I went with 4.10s in my mustang, never bothered to reflash the ecu, and was off by like 15%
+1 Loss of cruise-control seems to be the main negative associated with this.
And I thought I remember reading a post from a member who went with the 3.9 in his AT... ...and I thought he had swapped to the 3.7 prior to that. Might be worth some searching to see what the prefference was.
And I thought I remember reading a post from a member who went with the 3.9 in his AT... ...and I thought he had swapped to the 3.7 prior to that. Might be worth some searching to see what the prefference was.
Aaron (arazonag35coupe), I am glad you are still enjoying your gear change, let me know if there is anything else I can help you with. I have a Nismo clutch (and flywheel) in stock, I can give you a great deal on it and the install. Lemme know..........
