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The 915 has always been a trans to some extent has to be learned to shift, however, may of our cars have have had their transmissions "rebuilt". The OP's low mileage SC maybe had aggressive shifting by previous owners (hey its a Porsche) causing shifting issues with low miles. Transmissions that have been rebuilt vary to the degree of parts replaced because its up to the rebuilder/tech hence subjective decisions on what to replace. This is my theory as to why the 915 owners all experience some similar issues, but also different in some way. The internals of one rebuilt 915 transmission compared to the next, are in varying degrees of wear because various parts have been deemed as "serviceable" or "good" and reused. Then they wear a little more after the rebuild and shifting challenges start. So much has been discussed of shifter rod adjustment and bushings and not enough.
My 77 S was a garage find that sat for 20 years and had 20k miles on its "rebuilt" transmission. During the "revive" to get it running, I replaced the tunnel fuel lines as well as all the shifter bushings and motor mounts. I added a new stock shift rod coupler and this is where I'm at now:
1st to second is very good almost smooth at any rpm (I don't go over 5k). I can downshift into 1st from 2nd or another gear from a slow roll MOST of the time. Sometimes, when at a stoplight, from neutral, it can be hard to get into 1st but it always goes in after a few jabs/cycles from 2nd to 1st. I adjusted the shift rod coupler with all the methods on this forum, Wayne's, John Walkers, etc. and any adjustment in any direction from where I am now, just made it worse in the respect that gears were out of range - No 1st in one direction or no 5th in another, or grinding in some way. I always ended up in the same spot I'm at now which I'm happy with and have learned to shift/live with like I mentioned in my first sentence. BTW, as another attempt to improve things, I installed a WEVO shift rod coupler with no better results. Did the whole trial and error coupler adjustments and ended up with the same results. All said, Its not a Honda with a "butter" gearbox and I'm thankful for that!
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