Add your abody driveshaft length for quick reference

Transmission and Drivetrain Tech

  1. Sedanman

    Sedanman 67-9 Valiant specialist FABO Gold Member

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    A 108 wb with 904 & 7 1/4 to 8 1/4 swap the difference between 7.25 and 8.25 housings is 1.25 so what ever your original drive shaft measures minus 1.25.

    Here is some other tech I've found from here:

    108"wb with 440/727/8 3/4=46.5
    904/8 3/4=49.25
    add 2.25 for 7 1/4
    subtract 4" for 727
    8 1/4 D shaft is 1.25 shorter than a 7 1/4 D shaft
    727/8 1/4 48.9 w/ 108 wb

    111" wb w/ 904/8 3/4=51.99

    Make sure your yoke isn't tight in the trans & leave about an inch out for play.

    feel free to add your set ups so others have a quick reference
     
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    • duster731

      duster731 young gun

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      Im a little confused or just not reading it right but if I have a 904 / 7 1/4 how much shorter does my driceshaft need to be when I ad a 8 3/4 rear thanks
       
    • Sedanman

      Sedanman 67-9 Valiant specialist FABO Gold Member

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      What body?
       
    • Sedanman

      Sedanman 67-9 Valiant specialist FABO Gold Member

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      if 108 it is 904/8 3/4=49.25 shaft. I just copied what others have done & posted here
       
    • 67valiant 100

      67valiant 100 go fast or go home

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      What about an early A-body ('65 Barracuda) with a 273, 4 speed, 8 3/4 rear? Thanks
       
    • duster731

      duster731 young gun

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      An a body duster its in my avatar:bom:
       
    • Sedanman

      Sedanman 67-9 Valiant specialist FABO Gold Member

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      Ahhhh,that it is lol. so it's 108 wb
       
    • duster731

      duster731 young gun

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      So 49.25 is what size my shaft needs to be for the 8 3/4 rear how is this measured.. sorry for hijacking the thread that's my last question
       
    • '64 Cuda

      '64 Cuda Well-Known Member

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      As best I can remember you need to shorten your drive shaft 2 1/4" when going from a 7 1/4" rear to an 8 3/4" rear.
       
    • 66cuda-s

      66cuda-s Well-Known Member

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      So, where do you measure from for the drive shaft? Is it end to end, or u-joint center to u-joint center?

      Thanks!!
       
    • Sedanman

      Sedanman 67-9 Valiant specialist FABO Gold Member

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      center of joint to center of joint
       
    • Sedanman

      Sedanman 67-9 Valiant specialist FABO Gold Member

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      My 67 valiant has a 904 & 7 1/4 & c-c of joint is 51 1/4 & I'm swapping in an 8 1/4.
       
    • 67valiant 100

      67valiant 100 go fast or go home

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      Any body?????????:glasses9:
       
    • 66fs

      66fs FABO Gold Member FABO Gold Member

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      49.58 inches for 66 Valiant and Barracuda with manual trans and 8.75 rear. Believe it or not, 48.96 for a 340 4 speed Duster with an 8.75. I used one from a 71 340 Duster in my 64 Barracuda with 4 speed and 8.75.
       
    • 67valiant 100

      67valiant 100 go fast or go home

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      Thanks 66fs :thumrigh:
       
    • Bulldozer

      Bulldozer Well-Known Member

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      ok so not to threadjack but can anyone tell me how long my driveshaft should be for a 318/904 to a 7 1/4 rear for a 73 duster? does anyone know if the splines of a 73 3 speed manual are the same as a 904 in other words would a driveshaft out of a 225/6 3 speed manual 7 1/4 duster physically work with a 318/904 7 1/4 rear end ? thanks, im sure there is a thread on this but i cant seem to find one...
       
    • 72ScampTramp

      72ScampTramp Scamp Tramp

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      Or how about Dana 60/727/440 STOCK LOCATION IN SCAMP/Dart
       
    • Demonracer

      Demonracer 71 Demon 00 Ram 16 Chrysler 300S 05 Caravan FABO Gold Member

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      My '71 Demon, 360/727/Dana60, 44" cl-cl of 1350 u joints.

      Bill S.
       
    • 67hfish

      67hfish Well-Known Member

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      '67 Formula S, 383/727/8.75 45"
       
    • unknownsnake

      unknownsnake Well-Known Member

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      ok I am seeing 45 and 46.5 for 727 8 3/4 for a dart sport. So which is it?
       
    • pettybludart

      pettybludart Well-Known Member

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      I have a 66 Dart with 410/904/Dana60 111"wheelbase,measure 52 1/4 center to center.(with 1350 u-joints)When I had the 8 3/4 in the car I was using a stock 73 swinger 318/904/7 1/4 driveshaft(108 wheelbase)worked fine for many races.
       
    • unknownsnake

      unknownsnake Well-Known Member

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      I am having a good one made so I would like a good measurement. My rearend isnt in yet
       
    • 64physhy

      64physhy Well-Known Member

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      In my Duster with a small block/904/Dana 60, it came out to 48" center to center.
       
    • sireland67

      sireland67 Well-Known Member

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      If I remember right my 4-speed, 8.75 ended up being 49.25, I do have +1 xhd springs and it sits really high in the rear.
      Local driveshaft shop it cost me $280 including tax to build one.
      I gave them the tranny yoke, they made one with 3.5" tube and 7290 spicer yokes and spicer u-joints installed.

      If you are changing from a 7.25 to any rear check the yoke size.
       
    • unknownsnake

      unknownsnake Well-Known Member

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      I am getting the whole package. New shaft and new yoke
       
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