Two piece driveshaft...Why?

Discussion in 'SRT Hellcat General Discussions' started by CNYHC, Aug 25, 2015.

  1. CNYHC

    CNYHC SRT Hellcat Supporter Gold Supporting Member

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    Does anyone know why these cars have a two piece driveshaft instead of a one piece DS? There must be a reason since a one piece is easier to make and cheaper. A lot of drag racers are replacing the two piece with a one piece... I don't get it.
     
  2. B5 Blue

    B5 Blue Platinum Member

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    Wrong, same length cut in 2 is stronger so then they can make in skinnier read cheaper
     
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  3. CNYHC

    CNYHC SRT Hellcat Supporter Gold Supporting Member

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    Thanks!!
     
  4. MrBigKid

    MrBigKid BANNED

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    I'm just guessing here...

    Maybe they put in the weaker DS so if someone got rough it would act as a fuse and keep something far more expensive from blowing. And IF you upgraded your DS and blew that something else, they could claim void on the warranty.

    Just a guess...
     
  5. purnrg

    purnrg BANNED

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    Also to accommodate the longer wheelbase in the Charger and 300 easier
     
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  6. Fast cat

    Fast cat BANNED Hellcat Car Club

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    I'm guessing it had something to do with the higher top speed, the same reason they put the small ass rear tires
     
  7. Speedman

    Speedman Silver Member Hellcat Car Club Gold Supporting Member

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    drive line 2.jpg drive line.jpg

    Ya Right
    These are actual Hellcat Drive lines.
     
  8. usmc341

    usmc341 Gold Member

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    They should have went with CF (a la GT500) or at the very least 1 pc aluminum. DS is one component you don't want to skimp on
     
  9. rayzazoo

    rayzazoo DRIVESRT.COM Gold Supporting Member

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    There are also NVH issues to consider with 2 vs 1 piece.

    As for the twisted driveshaft, better that than the engine, transmission or rear end. Driveshaft is cheap compared to those other parts from a warranty standpoint.
     
  10. Lighty

    Lighty Silver Member

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    Critical speed is a lot higher on the 2 piece... Maybe not a factor on a quarter mile run but could be on an extended high speed run ~ 200 mph. Drive shift failure at 200 may not be fun...but how many get any where close to that.
     
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  11. themarshall

    themarshall Silver Member Hellcat Car Club Gold Supporting Member HCC Charter Member

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    Yo Speedman, your two pictures show a lot, one of the reasons two piece shafts are being replaced, Answer, carrier ber. Itself is in rubber, that is what is flexing hard at drag track with DR's. Flexing can cause wobble. wobble can cause vibration. vibration can cause failure. By the end of Oct. here in the NE the season will be almost over, maybe we will know a little more then.
     
  12. Speedman

    Speedman Silver Member Hellcat Car Club Gold Supporting Member

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    Put your car on a Dyno and do a couple of hard pulls and WATCH that drive shaft move around.

    torque tube.jpg Most people that have a hellcat don’t realize that this driveline design is not suppose to move around
    Like a U-joint design. What dodge should have done is run a torque tube tying the transmission and rear housing together.
     
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  13. CNYHC

    CNYHC SRT Hellcat Supporter Gold Supporting Member

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    and a transaxle too...better weight distribution... Of course, the car would be way more expensive then.
     
  14. Speedman

    Speedman Silver Member Hellcat Car Club Gold Supporting Member

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    You get the idea
     
  15. Trucker Bob

    Trucker Bob Silver Member

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    Thats is what I was told when I asked at My Trac Day. That is was cheeper to replace the DS. Than it is the rear Dif..
     
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