early driveshafts to late axles

Discussion in '40- & 55-Series Tech' started by Mickey Plunkett, Nov 13, 2003.

  1. Mickey Plunkett

    Mickey Plunkett

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    I'm sure this has been covered a million times so don't flame me for being new. What's the best way to mate early (71) driveshafts to late (79) axles?
     
  2. woody

    woody unhelpful spotter Staff Member Admin

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    best way...hhhmmm...

    One option is to locate fine spline undrilled flanges for the axles.

    Another would be to use the slip yoke from a 79 and the mainshaft from the 71...IIRC, the shaft splines are identical.

    Another might be to weld shut and redrill the existing 79 flanges.

    Not sure which is best, personally I'd do the flange swap.
     
  3. cruiserman

    cruiserman

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    Weld and drill.
     
  4. Mickey Plunkett

    Mickey Plunkett

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    If I go looking for a set of late driveshafts, what's the range of years that will match up with the 79 flange?
     
  5. woody

    woody unhelpful spotter Staff Member Admin

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    79 flange outta match a 74-79 4-speed tranny. 73-older are the same, 80+? is the split case and I honestly don't know if those match or not...
     
  6. 3_puppies

    3_puppies SILVER Star

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    Not certain, but I beleive the lenght of the 79 shafts is different than your early 70's. the 4 speed will be longer in the front shorter in the rear than the 3 speed.
     
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