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  1. #1
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    3.73 gears in 2011-2014 charger srt8?

    Anybody done this?? Looking into this or 3.55s?This 5 speed nag1 tranny needs some lower gears.


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    Rob


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  2. #2
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    The factory did 3.92's in 2011 on the Charger Mopar 11.

    That's about 3,100 rpm at 80 so maybe a little much, the 3.73 about 150 rpm less.

    Should rip in the city but will tach up a bit on the highway.

    Your 3.06 in 4th will turn about the same revs as the 3.73 in 5th so good way to see if you can live with the highway rpm before making the swap.




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  3. #3
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    I had about every gear ratio in my 2013 Challenger SRT...3.23, 3.55, 3.73, 4.30....the 3.73 performed the best all around for street and strip. Actually did my PB with the 3.73.





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  4. #4
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    Quote Originally Posted by Slidd View Post
    The factory did 3.92's in 2011 on the Charger Mopar 11.

    That's about 3,100 rpm at 80 so maybe a little much, the 3.73 about 150 rpm less.

    Should rip in the city but will tach up a bit on the highway.

    Your 3.06 in 4th will turn about the same revs as the 3.73 in 5th so good way to see if you can live with the highway rpm before making the swap.




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    Thanks for that info. I’ll try that


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  5. #5
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    Quote Originally Posted by TNCHARGER View Post
    I had about every gear ratio in my 2013 Challenger SRT...3.23, 3.55, 3.73, 4.30....the 3.73 performed the best all around for street and strip. Actually did my PB with the 3.73.
    TN,
    Did you ever have any issues with any of the swaps? Can you just change the gears or have to buy the whole thing?
    2 more questions :
    -where you get them?
    -was it a noticeable difference between the 373 and the 306?


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  6. #6
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    Time to bust an ongoing wive's tale...

    Your engine could NOT care less at what rpm it cruises at on a highway. At legal speeds, there is absolutely zero(!) damage occurring. Those that say otherwise - for them - its a touchie-feelie thing that the love of their life, their engine, is somehow being compromised. It isn't.

    Therefore; pick a ratio and buy it. I worked my way through four units to arrive at 3.92:1 with different engines. The performance gains are self-evident. It takes existing SAE torque and multiplies it by that ratio! Guess what that means. In other words; bragging about some high HP value means nothing. Torque does the work in these pigs. Without putting too fine a point on it; 3.92s behind an extremely healthy 440 puts the Magnum in a category where very few marques can compete.

    Using my right foot to modulate the gas pedal means I have infinite range adjustment between idle and WOT (1000HP means f!ck-all if you can't properly apply it).
    Last edited by Hemissary; 01-10-2019 at 10:37 PM.
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  7. #7
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    3.91s will be the most fun.

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    2006 Dodge Charger Daytona TorRed #1354, SRT Heads/Intake - ARH Long Tubes - Spartan Plus Cam - Magnaflow - 3.91s - 411rwhp/410rwtq
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  8. #8
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    Personally I would not like anything lower than the 3.73. I feel it is at the edge of what is comfortable on an interstate IMO. The 4.30 caused my engine to start overheating at constant speeds above 70 mph.

    The 3.73 and 3.91 can be purchased from your dealer or look for a used unit. You might talk with BNFY. I would advise buying the whole differential.

  9. #9
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    Man I really did look at the 3.91 but people say it’s to much. I guess their cheaper for some reason also, I’m told 1st gear would be useless in my ‘12 superbee.


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  10. #10
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    Quote Originally Posted by TNCHARGER View Post
    Personally I would not like anything lower than the 3.73. I feel it is at the edge of what is comfortable on an interstate IMO. The 4.30 caused my engine to start overheating at constant speeds above 70 mph.

    The 3.73 and 3.91 can be purchased from your dealer or look for a used unit. You might talk with BNFY. I would advise buying the whole differential.
    Was the 3.73 night and day difference? Did you have 3.06 like mine?


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  11. #11
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    I got a guy works at dealership and quoted me 28 or $2900. Can’t remember now. Seems pricey but I really would like to do something like this if there’s good feedback about doing this.


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  12. #12
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    Had 3.91 in my car for several years.
    5.7 cam/nitrous auto car. Lots of fun on street and strip. Went to a custom 4.10.
    You will notice a big difference going 3.73 or 3.91 swap from a 3.06, it’s worth it.

    P.S. first gear is only useless if you don’t have a good tire and spin, first gear and 3.91s get you out of the hole faster than the guy next to you.


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  13. #13
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    One has to give up the idea of going fast (>175mph). Its a foolhardy / stupid idea on public roads any way ya look at it.

    A small price to pay for the outright gain in acceleration (rate of).

  14. #14
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    Anybody got a link to where the cheapest place to purchase?


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  15. #15
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    Quote Originally Posted by robstorredr/t View Post
    Man I really did look at the 3.91 but people say it’s to much. I guess their cheaper for some reason also, I’m told 1st gear would be useless in my ‘12 superbee.


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    Who are "they"?

    "They" are the same worry-warts I was referring to above...emotionally driven that the engine is somehow being "over-revved" :^)

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