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911pcars 911pcars is offline
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Join Date: Jul 2000
Location: So. Calif.
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Matching inboard/outboard CV joints could be a challenge. I happened to upgrade to the same year alloy control arms at about the same time so the drive and axle flanges were the same (6 bolt, - 8mm). If you mate a late 915 to an early axle flange, the outer end should be 4-bolt; the inner end the later 6-bolt pattern. If it's an early 915 (prior to '77) the early CV joints should bolt in. One could also swap out the gearbox drive flanges so both CVs are the same. In addition:

Dan @ CarsInc provides this data:
There are least 4 style axles, plus flanges that attach at the Trans had
either fine splies or coarse splines. Fine splines were used in LSD gearboxes.
69-77 4-10 mm X 48 mm bolts and two pins per CV joint
78-83 6 - 8mm x 50 mm bolts per CV joint
84-86 6-10 mm x 50mm blots per CV Joint
87-89 6-10 mm x 50mm bolts per CV joint (No bolts used on outside CV
joint). However these years used the G50 gearbox.

And in one of Wil Ferch's threads:
"I'm quite sure that around late 84 or early 85, there was a transition period where you may find either 8mm or 10mm bolts, using either a 100 mm or 108 mm axle flange."

That's the extent of my knowledge base when in comes to CV joints. Hope this helps.

Old 01-31-2004, 12:16 AM
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