4.10 To 4.56 Rear Gear?

Discussion in 'Performance Mods' started by Big Daddy's SRT, Jan 12, 2018.

  1. Big Daddy's SRT

    Big Daddy's SRT Member

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    How bad will the mpg take a hit going to 4.56? I changed out my Challenger's 3.06 to 3.73 and it cost me 2 mpg.
     
  2. Psycho1122

    Psycho1122 Full Access Member

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    My 05 RC in the state of tune its in gets 11 MPG overall. If I'm just cruising the freeway at 70, it will get 17 MPG. The .5:1 top gear really pays dividends.
     
  3. blazinsrt

    blazinsrt Full Access Member

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    Man I wish I could get that in my QC. I'm thinking of going the other way to 4.10s. I get like 6mpg on average around town lol. I do love rolling burnouts though...
     
  4. IronAffliction

    IronAffliction Full Access Member

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    If you want mpgs you should have got a different truck
     
  5. NukeGM/Ford

    NukeGM/Ford Active Member

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    Anyone that gets semi decent mileage is driving it like a soccer mom (auto) or short shifting every gear.

    673 whp - 9.5 combined city/hwy
    - 7 city
     
  6. Psycho1122

    Psycho1122 Full Access Member

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    OR if you have the typical over rich safe tune or your tune is stock...;)

    Now If I stretch the trucks legs?!? It will get 9 :rock:
     
  7. blazinsrt

    blazinsrt Full Access Member

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    Oh I knew what I was getting.. A guy can dream of both right??
     
  8. Big Daddy's SRT

    Big Daddy's SRT Member

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    I knew that one was coming. Been on forums for hot rods for years and anytime someone even hint's at mpg it's always "should have bought you a Toyota" or something on that order. But's that's o.k. when you know it's coming doesn't really matter.
     
  9. IronAffliction

    IronAffliction Full Access Member

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    I wasn't saying that in a dickish manner or anything I was just saying it. Just so ya know
     
  10. Big Daddy's SRT

    Big Daddy's SRT Member

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    No offense taken Iron "keep on trucking"! I've gotten to old to let things bother me much, just want my beer cold, women hot and my hot rods ready to lay the rubber down!
     
  11. IronAffliction

    IronAffliction Full Access Member

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    Haha I like the way you think!
     
  12. mopar-or-no-car

    mopar-or-no-car Full Access Member

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    WTf? Is this what its like to get old? :):)
     
  13. Big Daddy's SRT

    Big Daddy's SRT Member

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    You funny Mopar-or-no-car! I mean funny like ha ha not young gay lads oiled funny.
     
  14. blazinsrt

    blazinsrt Full Access Member

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    HAHAHA dont ask him about him about his purty mouth he will show you lol....
     
  15. stealth78

    stealth78 Full Access Member

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    What the Hell are you talking about? Both ratios require being in 5th gear. Had both, been there with both. 4:56's are by far the best gear for these trucks. If you're trying to accomplish "154mph", going to the strip (and not running a 28" slick to offset the difference in gearing), or just around town, the 4:56's are the king. Had an 06 and an 04 back to back... unbelievable difference between the two gears!
     
  16. SrtDub

    SrtDub Full Access Member

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    Im fixing to try some 4.10s since i am going in to overdrive at about 1000ft with the 4.56 gears... #questfor10s
     
  17. stealth78

    stealth78 Full Access Member

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    What are you running for 1/4 miles times and trap speeds? In a stick 4th gear is 1 to 1, I would assume your final drive gear would also be 1 to 1 prior to shifting into OD? Am I wrong here or are you doing in excess of 120mph through the traps?
     
  18. RagunCajun

    RagunCajun Full Access Member

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    So out of the 4 pages i've read, you only want a lower rear end gear to make you feel better when putt putting on the highway in 6th gear.

    If that's the case, leave it a lone.
     
  19. SRT2SLOW

    SRT2SLOW Active Member Supporting Member

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    you need 4.88's
     
  20. ViperPete

    ViperPete Full Access Member

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    I was thinking 5.10s