1995 transmission slipping

[scoteric]

I have a 1995 park avenue with 105,000 miles on it. I drove it home and parked it in the driveway and it ran fine. Several hours later my wife tried to back out of the driveway and there was no reverse. I tried several minutes later and it ran normal. This morning it would not hardly go forward or backwards. I am I able to do anything to save it without replacing the transmission? Any suggestions on what to check.

[HotZ28]

Was the car parked several hours outside with less than 45 deg temp?

[scoteric]

No the car was in the garage last night and the temp was in the 50's.

[maxwedge]

If it is full it is coming out.

[scoteric]

The transmission oil is full and does not smell burnt. I backed it out of the garage and the transmision barely moved the car. I let it sit and idle for about 15 minutes. I went to move back into the garage and the transmission worked like normal. I dove it around the block and the acceleration appeared normal. I had my neighbor who is a mechanic scan for any codes and nothing showd up. Thanks for the replies.