Stop driving the car otherwise you will be walking in short order.

Find another transmission, needle bearings went through the planetary gear set and you will find broken gears.

The K2 bushing has worn allowing the sun and ring gear to run off center, this wears the aluminum housing, causes excessive end play allowing needles from the thrust bearing to fall out and jam the gears.

Another contributing issue. Early ( pre 99? ) thrust washers tended to spin the race further contributing to aluminum wear. Later units have thrust washers with ears to prevent spin and a needle K2 bearing. Late needle bearings can be fit to the early housings with some machine work. EDIT but not the K2 bearing as the shafts are different

You can swap the entire planetary gear set and output shaft between early / late but not individual parts.

Be aware, 4 and 6 cyl ratios are different from high power 6 , 8 and 12 cyl.

Very early in K2 bushing failure there will be an intermittent buzz / siren type of noise due to the planetary running off center. My 97 C280 suddenly started to do this at 164,000 miles. There was no evidence of metal in the pan but I rebuilt it at a preventive measure.

These transmissions are not difficult to take apart. Also have a look on car-part.com This searches participating salvage yards.

You might like this site https://www.motortrendondemand.com/show/dirt-every-day/42026322/ ( older shows are free, newer ones are pay )