I have a 96 Fullsize 5.7 350 with a 4l60 Transmission, I believe. Bone Stock truck. Transmission has been shifting flawlessly from the day i've owned it. So smooth you don't even feel it. But, on the highway, at high speeds when giving very little acceleration on a downhill or a stretch where torque is not needed, the truck will hesitate. I am used to it, it's been doing this for about a couple of months now. Havent found time to get under there and check it out. I believe it was a TCC Solenoid causing this. Anyway, Today on the highway, I noticed the truck was shifting weird. It would downshift easier then usual while accelerating on the freeway. The accelerator felt different. After getting off the highway, I noticed it would not shift into second gear from the stop very easy. It had to get to 5000RPM before it would do it. Or I could shift by letting go of the gas. Got home, and there is oil all over. It was spewing oil from the back. I can't seem to find out where it is coming from. It looks like motor oil. I wondering if it is dark/brown transmission or converter oil. I'm stumped. Any suggestions, ideas, do and dont's, would be much appreciated.