So the truck was running great, shifting great, no slips. Then at a stop light today, it felt like it was slipping like crazy...and would move very slowly. It started out of the blue with no warning signs.

So Pull over, and checked for leaks and fluid levels. All good

In D - It barely moves when pushing the gas
In 2 - Same issue as D
In L - It works perfect and goes from a stop no problem. As I upshift from L to 2 and then to D, works great. If I come to a stop again, I have to put in in L to move again.

Is my trans going out? Do I need a valve body job? Torque converter?

1997 4runner, 4x4, supercharged, 214k miles.