Uhhhhhh. Slipping trans?

Today while accelerating from a stop the car's RPM's would go up a little bit then all of a sudden there would be a bang. This happened about 10 times or so. If you let off the brake in gear the car will pull as normally, then when throttle was applied there would be a small increase in acceleration and then a split second following, the car lurches a little and then accelerates fine. I was watching the trans temps on the Aeroforce and this was happening all the way from when I started the car (50*) to when I got home (135*). About an hour's drive. Also, up shifts while moving sometimes felt a little lazy. But only once or twice, nowhere near like the from stop behavior. Is this the end? For what it's worth, I installed a ZZP shift kit and changed out half the fluid (no flush) about 5 or 6k miles ago mainly because I was having the PCS issue with the harsher shifting. That cured that for the most part. As for my driving style, it's not gentle but I'm not a racekar driver either. Car will see one or two WOT pulls a day. Sometimes not even. Almost at 69k miles now. Time for some Lucas all up in this thing?

Thanks for any advice.

Don't quote me, I think that is a input piston apply seal characteristic.

This morning on the same commute it acted up only once. Drove perfectly normal pretty much. It's weird that sometimes it feels like it slips, yet other times I can roast the tires.

Bill: Can you explain a little more about that?

Also, I think I may throw in some stop slip later today.

Input clutch piston seal. Essentially bill means the one seal is stretching out a little, allowing fluid past it so its not sealing. Sometimes its catching and sealing. The shift kit upped the line pressure to overcome the leak, which is why it got better. Thickening up the oil with stop slip will only be a band aid on the actual problem. However since you were having pcs solenoid problems, id replace that first before shelling out for a rebuild.

Close to what Jevik said.. I was thinking this
No Forward Cold