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Thread: diff ratios hemi

  1. 06-30-2018 #1
    benjohns
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    diff ratios hemi

    so i have purchased a srt8 2009 rear end and swaping it out for my 2006 300c both pumpkins are different ratios

    srt8 3.06 I think
    300c 2.82 I think

    can someone help me understand where I can change this info iv looked in the engine and trans

    I see there is a gear settings but that's every gear I'm looking to change the final drive .

    all the info I google the answers and most is about the gm platform not dodge



    iv also compare the stock 300c trans and srt8 stock trans and the gear ratios are the same yet the pumpkin is different :???
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  2. 06-30-2018 #2
    Bryan86
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    Wondering this as well. I have a 3.91 waiting to be put on
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  3. 06-30-2018 #3
    coanan
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    hp scanner - vehicle controls and special functions
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    2018 Trackhawk PCM/TCM tune by Dusterhoff.
    Flex Fuel, MMX faux 95mm TB, GripTec 2.85, 10% ATI lower, FIC1200, ARH 1 7/8 w/cats, 180 T-stat

    13 Chrysler 300S, RAM BGE 412 stroker, cam motion 232/246 619/619 118 +4, ATI 18% OD pulley
    Whipple Gen5 3.0, 2.50 upper pulley, Smooth Boost controller, FIC 1200 inj. Nick W 108mm TB, FORE dual return fuel system, E85, FTI 2800 stall(SRT83380), SHR WAR Viking trans and valve body, Getrag 3.73, 1 7/8 kooks w/hi-flow cats, 3" Magnaflow Cat-back 943rwhp
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  4. 07-21-2018 #4
    HemiX2
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    The gear ratio settings are located in the TCM not the PCM, but I don't see any access to this in the Transmission Section of the HP Editor. In my somewhat modified 05 LX, I removed the stock 2.82 "peg leg" diff. and went with the SRT 3.06 LSD with 600 hp axles. The only ways I know of to change the settings in the TCM are with the Diablosport Tuner, or do what I did and get a Mopar SRT Performance TCM. This has all the proper TCC Settings you'd want for a performance Hemi too. If you do this, just make sure it's for the SRT and not the standard 2.82 diff. that come with the, 5.7's.
    Two (now Three) Hemi's, an 05 5.7 Magnum, an 06 300C SRT8 and an 06 5.7 Jeep Grand Cherokee, all somewhat modded. The 5.7's are modded almost the same with advanced (10* for Maggie and 6* for the Jeep) FRI Sidewinder cams/6.1 valve trains, ported/milled heads w/new valve seats, SC, DS and HP Tuners, headers, cat. backs, underdrive pulleys, SOS coils, catch cans, 90 mm throttle bodies, plus a bunch of cosmetic stuff. 06 300C SRT8, Comp. Cammed, HPT tuned, Foose wheels, 85 mm TB.
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  5. 08-28-2018 #5
    GeForce1986
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    its in the scanner
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  6. 08-29-2018 #6
    AVMPerformance
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    Quote Originally Posted by Bryan86 View Post
    Wondering this as well. I have a 3.91 waiting to be put on
    Byan86, may I ask where you got your 3.91? Ive been trying to find one, and cant seem to. I can new, but rather not buy it new.
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