my 92 legacy had been driving fine. I parked it overnight, and the temperature dropped down to about 32 degrees that evening. When I started it in the morning, I put it in drive, and I felt the transmission slipping. The transmission felt as if it was in neutral. When I put the transmission in (3), it would not slip. it actually seemed to run fine. But when I would return it to drive, it woud slip. So I drove it in (3). When the engine temperature increased to the normal range, I put it back in (D). The transmission stopped slipping and ran fine all day. After sitting for another cold evening, the problem has happened again. Any ideas would be appreciated.
Note: The ATF fluid level is normal (full). The fluid is clean, and does not smell burnt. Thanks again.