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Old 12-30-2012, 11:44 PM   #1
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3.73 or 4.10 that is the question ?

Hey guys I'm new to M.E. Forums but not new to Mustangs. I have an Automatic 04' GT with some minor bolt-ons Accel,K&N, SLP LM2 w/o cat mid etc. But I am at a crossroad with the gear because my 90' Fox assaulted the tires w/ 4.10 due to the 347 but the 04' doesn't have the brrrrrap effect of the FOX any input would be greatly appreciated !!!
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Old 12-30-2012, 11:47 PM   #2
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4.10's with the auto by all accounts.
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Old 12-30-2012, 11:49 PM   #3
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Does it affect the top end real bad on an auto though?
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Old 12-30-2012, 11:52 PM   #4
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Does it affect the top end real bad on an auto though?
Not to my knowledge.. A member named Cole Johnson did a great write up on just this. Lemme see if I can dig up a link, he has a New Edge as well.
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Old 12-30-2012, 11:57 PM   #5
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4.10 Gear Speed/RPM Video

See if this has the info you are looking for.
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Old 12-30-2012, 11:58 PM   #6
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Cool man thanks I read one about the 5spd but not on an Auto. The 5spd at 75 was running about 3100 rpm and that worries me
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Old 12-31-2012, 12:03 AM   #7
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Cool man thanks I read one about the 5spd but not on an Auto. The 5spd at 75 was running about 3100 rpm and that worries me
Not sure about the OD ratio's between manual and auto but I'd assume they are close. Sounds like maybe a 3.73 might be a better choice if you do any amount of highway/interstate driving.
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Old 12-31-2012, 12:05 AM   #8
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Yea that sums it up 4.10's it is I can afford the smiles per gallon !!!!
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Old 12-31-2012, 12:07 AM   #9
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Yea that sums it up 4.10's it is I can afford the smiles per gallon !!!!
glad you found what you needed to know!
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Old 12-31-2012, 12:13 AM   #10
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I need to find someone willing to trade some offset black wheels and tires for some 18" Offset Chrome Saleens

---------- Post added at 12:13 AM ---------- Previous post was at 12:11 AM ----------

I have fr500's on my 99 the yellow one in the pic but my maroon and black 04 in the background has the Saleen's

---------- Post added at 12:13 AM ---------- Previous post was at 12:13 AM ----------

I have fr500's on my 99 the yellow one in the pic but my maroon and black 04 in the background has the Saleen's
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Old 12-31-2012, 10:15 AM   #11
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It will lower your top end by 15mph or so
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Old 12-31-2012, 11:43 AM   #12
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Cliffyk has a site that shows you rpm and speed.

It's awesome.
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Induction: Kenne Bell | wHp: 515 Tq: 503 | 1/4 Mile:11.09@123
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Old 12-31-2012, 11:46 AM   #13
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My car drifts nasty with just 3.55's but I think the 4.10's is that extra edge I need
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Old 12-31-2012, 11:48 AM   #14
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Day you go, check to Cliffy's link and figure punch in your specs....
3rd and 4th gear top speeds
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Old 12-31-2012, 12:10 PM   #15
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How hard is it to switch gears? I do in-town driving all the time so I would like 4:10s but I do have a few road trips on the horizon so I don't want to have bad mpgs on the highways. So I would like to keep the stock gears and just switch then out with 4:10s when I please.
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Old 12-31-2012, 12:44 PM   #16
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Your highway mpg will suck
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Old 12-31-2012, 12:44 PM   #17
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I don't think so.


On the swapping gears in and out.
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Old 12-31-2012, 02:18 PM   #18
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Well my 99' gets amazing gas mileage with the 3.73 but my 04' is an Automatic so we will see im ok with the smiles per gallon
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Old 12-31-2012, 02:23 PM   #19
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If you have 3.55 in your auto then get 4.10 you won't see much difference from 3.55 to 3.73
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Old 12-31-2012, 02:26 PM   #20
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Well I'm gonna order the FMS 4.10 and see how she drifts
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