Ok a buddy replaced his passenger front axel but it never engaged into the c clip. He drove about a block then started to freewheel no transmission engagement. We removed the axel and can now see a roll pin in the spline shaft which is in front of the c clip. Tried pushing it up with a long screw driver but it seems stuck. Can anyone shed some light on this for me please.

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92 e300d2.5t
01 e320
05 cdi
85 chev c10