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Old 03-02-2012, 09:28 AM   #1
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New 3.7 member question

Hey everyone I have been a proud owner of a new kona blue v6 auto for about a month now and I was just curious if there is a huge difference in the 2.73 vs the 3.31 gear ratio for the auto? I have some FPP 3.73 gears i got from summit but am afraid to put them in due to warranty issues because with the gears put in i would need a new tune and might have issues with the stock driveshaft. Any thoughts or opinions on whether i should wait til the warranty is up? It feels like it will be so long and im really tempted to put them in. Let me know some of your opinions. Thanks!
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Old 03-02-2012, 09:34 AM   #2
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Re: New 3.7 member question

i dont know bout warranty issues.. but drive shaft issues wit a gear swap is a new one to me. sounds like u need to call the dealer.

i got 2.73 in my car now... getn ready to put in my 3.45 from my old car. i wont say its like adding a supercharger... but u will most definatlely notice the difference.. and love it. u may think someone swapped your motor while sleeping..lol
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Old 03-02-2012, 09:39 AM   #3
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I doubt the gear swap would affect the driveshaft, but you would need to correct the speedo. If you're worried about the warranty, you can probably just have the dealer install them for you. I doubt your warranty would be voided for something like this, but you could always ask.
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Old 03-02-2012, 09:54 AM   #4
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True.. besides speedo correction i was just worried about the shift points too since its an auto. I was just thinking since the driveshaft is the weakest link in the new v6's the 3.73's would cause more stress on it? Heard it from another forum but could be wrong. But ive heard that the gear change is a mind blowing improvement like a motor swap.. lol Ford should at least upped the standard ratio to 3.08's. They just wanted to beat the camaro by 1 mpg so they decided on 2.73's.. one of those wtf decisions ford makes every now and then like trying to replace the mustang with the probe back in the day.. :0
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Old 03-02-2012, 10:11 AM   #5
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Re: New 3.7 member question

if we see 5.0 a gallon gas... u will b happy ford made that wtf decision..lol
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Old 03-02-2012, 10:14 AM   #6
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Very true! Ill be "that guy" you see riding a moped with the yellow reflector vest. Lol
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Old 03-02-2012, 10:22 AM   #7
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Re: New 3.7 member question

my most economical vehicle only gets like 25 hwy. and dats cause theres no cats, added msd coil and 6a box. on my 95 caprice. i think its time for a focus or something
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Old 03-02-2012, 10:35 AM   #8
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Quote:
Originally Posted by iwalkaline58
True.. besides speedo correction i was just worried about the shift points too since its an auto. I was just thinking since the driveshaft is the weakest link in the new v6's the 3.73's would cause more stress on it? Heard it from another forum but could be wrong. But ive heard that the gear change is a mind blowing improvement like a motor swap.. lol Ford should at least upped the standard ratio to 3.08's. They just wanted to beat the camaro by 1 mpg so they decided on 2.73's.. one of those wtf decisions ford makes every now and then like trying to replace the mustang with the probe back in the day.. :0
I don't think you need to change the shift points for a gear change. However, a tune with this would wake your car up some. A tune will void your warranty though.

---------- Post added at 11:35 AM ---------- Previous post was at 11:34 AM ----------

And yes, you will notice the gear change immediately lol.
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Old 03-02-2012, 08:55 PM   #9
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Yeah i heard a bama tune will really wake it up. But i would probably cry for days if i got a tune and something happened and my warranty was toast. Staying stock almost makes me cry too though being the gear head that i am
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Old 03-04-2012, 05:39 PM   #10
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Re: New 3.7 member question

It is my understanding that the rear gear swap will only change your acceleration and how fast you get into the power band of the car. I believe that 3.73 is a Ford approved gear ratio so you shouldn't have any warranty issues. The stock driveshaft, from what I've read, is prone to failure around 130 mph or so. If you keep below that the life of the driveshaft will be greatly extended. Though, in order to to get above 115 mph, you need a tune to remove the software governor and reprogramming the computer can void your warranty.
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Old 03-05-2012, 04:51 PM   #11
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The 3.73's are only appoved for the gt and the dealership cant calibrate it for the v6 even though they both have the same rear end. So i could get them put in but it would be useless without a tune. Shift points would be off speedo would be off and it wouldnt feel right. If i had a stick and the dealer could calibrate the speedo which they wont do on a v6 then i would be good to go.
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Old 03-05-2012, 06:08 PM   #12
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Re: New 3.7 member question

FRPP offers a 3.55 ratio axle assembly that I've been told was a direct bolt in unit on my V6. Maybe you could try a 3.55 ratio, that would give you significant improvement but still have the dealership able to calibrate it for your car
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Old 03-07-2012, 05:24 PM   #13
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No calibration for the v6. It only comes in 2.73 or 3.31 from the factory and the dealership will only warranty factory flashes and speedo changes. The 3.55's are for the gt even though they will fit in a v6
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