[Jerome74911S]

This is not the first thread on this problem; I know because I started one of them myself, and I read the other threads. The question involves gear shifting that gets more and more difficult the longer the car is driven, which is to say, the hotter it gets.

• My shifting, when hot, will first get difficult getting out of gear, and as the trans gets hotter, then it will also become harder to get into the next gear. It does not crunch going into gear until I have driven 4 to 5 hours. This means any gear.
  
  
• Most previous answers blamed an old clutch cable that is stretching, or even unraveling. My response to that is this: How does it then cure itself when the car cools off? The cable is not subjected to any appreciable heat, so why would that be a factor? My clutch is adjusted properly. Can a cable get stretchy, then not be stretchy after everything has cooled off?
  
  
• What about 'easy' other things, like the gear oil? I am using the Kendall that is highly recommended by many here.
  
  
• What else can be binding, or otherwise malfunctioning as it gets hotter? None of the symptoms are bad when the car is cooler.
  
  
• The transmission was recently rebuilt (8,000 miles) by a well respected shop that serves successful Porsche racers.
  
  
• I am able to double-clutch to upshift when hot, and double-clutch and rev-match to downshift when hot. Not necessary when cool.

The trans is a 1974 915.