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Third member interchange?

Discussion in '40- & 55-Series Tech' started by fr8train, Aug 12, 2003.

  1. fr8train

    fr8train

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    Will the 3rd's from a 64 fit a 75-79 housing?
     
  2. Pin_Head

    Pin_Head

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    Yes, but you need to drill out the holes on the casting. If you add the fine spline spiders, the later axles will fit too. If you swap flanges the drive shaft will bolt up.
     
  3. fr8train

    fr8train

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    Great! Thanks for the info. Forgive the newbie, but which casting? Or is this self evident once I am lookin at it?
     
  4. woody

    woody Internet Fireman Staff Member

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    the holes in the third...the studs in the steel housing are to large.

    the 64 will have coarse spline side gears, 68-later shafts are all fine spline, so you'll need to swap out spiders (or install a locker during the process for the later shafts)