Torque converter lock up rpm?

[Zach0112]

Okay, not entirely sure what to call it. I believe the torque converter is locking up. I was skimming through here just reading random threads and learning. Then I came across a thread that was discussing transmission slip. The guy stated to test for slip you would essentially power brake it (tires obviously are not going to turn over lol). Hold the brake and mash the throttle. He said it's not supposed to get above 2,000-2,300 rpms while doing this then I saw another thread Overdrive had commented on saying rpms should sit at 2,500 +/-100. Mine stops right at 2,500 so does that mean my transmission is starting to slip? Of course this is just for like a two second period before I let off. Thanks for any input you can offer.