My 93 SC has the same problem (pops into gear when shifting from park to reverse or drive, slight whining sound, and takes a long time to shift out of the the low gear when driving), but all these symptoms go away and the car works like a champ once the engine/tranny has warmed up. One mechanic told me was that it could be either a clogged valve or the clutch plates are worn. Another told me that it could be the hyrdaulic pump crapping out. Bottom line, the transmission is worn and needs to be replaced. I called around for a couple of quotes to install a rebuilt tranny... $2.3-3.5K. In the meantime, I've added tranny additive and it seemed to help a little but the symptoms are still there.