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Adam,
Your 915 sounds like it has a rare problem with the shift linkage internally. So, I suggest you prepare to change the gear oil, and investigate the shifting problem at the same time. If you have never changed the gear oil, I suggest 3.2 qt of SAE 90, or SAE 75W-90 Castrol Hypoy. When you drain the oil, it needs to be at full operating temperature, such as after an hour of highway driving. Drain the oil into a large funnel ... 12" or so diameter, with a white paper towel lining to filter any particles in the gear oil. Inspect the 'filter' for filings, shavings, broken 'chunks' of steel or brass. After the gear oil has been drained, remove the semi-trapezoidal cover with four 13 mm nuts ... forward of the drain plug location. If you happen to have the Haynes manual, it is shown on p. 111. After you have removed the cover, while watching the shift forks and levers ... have an assistant inside the car, slowly and carefully shift (or attempt) from neutral to each of the six gears and back into neutral. Observe carefully for any binding, blockage, or mis-alignment of the shift rod and guides ...
With the difficulties described ... something should be obvious! Let us know what you find! Be sure to have a notepad handy, and take notes of any problems you observe! Have the assistant go through an agreed-upon sequence ... and be sure to confirm what shift is being attempted.
PS. Be sure to check the shift linkage, including the shifter itself ... for excessive play, before digging into the transmission linkage and shift rods! There is a later post below about the shift coupler.
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Warren Hall
1973 911S Targa
[This message has been edited by Early_S_Man (edited 01-21-2001).]
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