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Slip yoke clearance

Transmission and Drivetrain

  1. Marc340

    Marc340 Member

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    Hi there , I am posting for the first time on this forum. I recently aquired a 1970 4 speed 340 Challenger. A pretty original car . Needs a little tlc but I am keeping it the way it is. Only a new carpet and one Seat cover. The previous owner Did Some work on the transmission. But I think he or the shop installed another drive shaft. The slip yoke is 3” out of the transmission. This is the polished part from the seal. Does anyone have the right driveshaft ( I guess it is the 45,6”) ? Or do you know the correct length? If someone has the right length and wants to sell Please let me know or If you have any other suggestions. Thanks ! Marc Ps I live in the Netherlands

    24027AB0-B7D4-4B31-A136-A0FA810919C4.jpeg
     
  2. Adam

    Adam Well-Known Member

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    A quick search of the internet for a driveshaft length chart shows 45.60, 45.79, 45.85. With a 340 and 8-3/4 rear, 727 or 833 trans.

    If the d/s is 45.6 long it is possible the trans has been swapped to a 904; or a different rear axle maybe?
     
  3. 704406

    704406 Well-Known Member

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    The shifter mount in the picture looks like it's over lapping the end of the Transmission, and it doesn't look right to me from what I remember of where the mount plate bolts on to the Trans. I don't have a picture of a 4 speed transmission and the rear shifter mount to compare to, anyone with a picture?
    What's your driveshaft length centre to centre of the u joints?
     
  4. 704406

    704406 Well-Known Member

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    I just looked on the net, and the mount location is very close to the rear of the tailshaft, maybe I'm wrong and it's just the drive shaft is to short, but still it just doesn't look right somehow. It's sad to get old and have your memory play tricks on you!
     
  5. moparlee

    moparlee Well-Known Member

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    The shifter mount is in the right location for an E-body, at the very end of the extension housing. Looks like to me the drive shaft is a good 3" too SHORT. See pic of mine.


    5-28-11 025.jpg
     
    Last edited: Dec 6, 2017
  6. 704406

    704406 Well-Known Member

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    Moparlee good picture, I see your shifter mount plate is a lot different than Marc's, maybe that's what is looking different to me.
    I does look like the driveshaft is 3" too short.
     
  7. 704406

    704406 Well-Known Member

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    I just looked in my 70 parts book
    70 challenger 340 v/8 8 3/4 rear with, 3 speed, 4 speed and 727 auto Trans part #2996142 is 45.79" long
     
  8. Marc340

    Marc340 Member

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    Hi Guys, thanks for your answers and your research. So i was right that the shaft is too long. Best I can do is to look for a drive shaft with the right length or a longer one and shorten it to the right length. I Did Some research and it is not the good way to lengthen the shaft.
     
  9. Marc340

    Marc340 Member

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    Glad that you found the right length . The service manual doesn’t mention the 340 driveshaft length
     
  10. DetMatt1

    DetMatt1 Well-Known Member

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    Hey Marc, let’s see those decals. Did you install them yet?
     
  11. Marc340

    Marc340 Member

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    Hey Matt , didn’t install them yetI am now first busy trying to get everything correct mechanically. Before getting a license plate over here I need to change a few things and I am busy solving the problem with the slip yoke ( I posted a thread )