Shorten Driveshaft, 7.25 to 8.75 swap

Transmission and Drivetrain Tech

  1. Hyper_pak

    Hyper_pak Old School Chrysler Fan

    Messages:
    1,604
    Likes Received:
    358
    Joined:
    Feb 14, 2010
    Location:
    Desoto Texas
    Local Time:
    11:27 PM
    Can anyone tell me what is the distance I need to shorten my driveshaft for this rear end swap? I saw the driveshaft chart and it looks like it right around 2 inches. Any info is appreciated.
     
  2. Car Nut

    Car Nut Mopar Master

    Messages:
    286
    Likes Received:
    542
    Joined:
    Dec 28, 2018
    Location:
    Zombieland
    Local Time:
    10:27 PM
    It’s best to remeasure for the new driveshaft when you install the rearend.
     
    • Agree Agree x 7
    • Like Like x 1
    • Cope

      Cope Fusing with fire

      Messages:
      2,441
      Likes Received:
      1833
      Joined:
      Oct 20, 2009
      Location:
      San Jose, Ca.
      Local Time:
      11:27 PM
      My drive shaft shop charged me like 60 bucks more to just build me a new shaft VS shorten my old one.
      Much stronger shaft (larger diameter) and big U joints. It was a no brainer for me.
       
    • 72bluNblu

      72bluNblu FABO Gold Member FABO Gold Member

      Messages:
      9,037
      Likes Received:
      3010
      Joined:
      Nov 28, 2008
      Location:
      NorCal
      Local Time:
      9:27 PM
      The difference between the 7.25 and 8 3/4 measurements is 2.25”, that’s the difference at the axle.

      Whether or not that’s the distance you need shorten your driveshaft depends on how well the current driveshaft actually fits the car. The best bet is always to measure your car. That said, that was exactly how much I had the driveshaft in my car shortened when I did my 7.25 to 8 3/4 swap.

      As for the price, the shop I used charged ~$80 to shorten the driveshaft. Having a new one fabricated is usually upwards of $200 or more depending on the construction and size of the u joints.
       
    • Hyper_pak

      Hyper_pak Old School Chrysler Fan

      Messages:
      1,604
      Likes Received:
      358
      Joined:
      Feb 14, 2010
      Location:
      Desoto Texas
      Local Time:
      11:27 PM
      That is what I needed to hear, thanks. And I agree, I will measure, but want to make sure the number I come up with is reasonable. The driveshaft BTY is a ball and trunnion replacement shaft with the Toyota slip yoke front, so it's not what I call normal. It was for my wagon, but not for the 8 3/4 I installed.
       
    • 72bluNblu

      72bluNblu FABO Gold Member FABO Gold Member

      Messages:
      9,037
      Likes Received:
      3010
      Joined:
      Nov 28, 2008
      Location:
      NorCal
      Local Time:
      9:27 PM
      Sounds like fun! Measure twice and cut once as they say. Good luck!
       
    • Hyper_pak

      Hyper_pak Old School Chrysler Fan

      Messages:
      1,604
      Likes Received:
      358
      Joined:
      Feb 14, 2010
      Location:
      Desoto Texas
      Local Time:
      11:27 PM
      Thanks for the data. Most of my projects, I cut twice after measuring just once! Hah!
       
    1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
      By continuing to use this site, you are consenting to our use of cookies.