I have a 95 camaro z28, It is an automatic, when The car heats up and I am at a stoplight in (drive) I hear this clunking sound.....It sounds like its coming from either the cat ( could be because I have a little exhaust leak) or underneath the center console.... I had the car jacked up the other day and noticed a little bit of fluid around the tranny side of the driveshaft..... any ideas?

u joints?

 

again this problem only happens when the car is warm and in drive

 

ttt