u/LabattGenuine

I was driving and suddenly lost all gears. I pulled over and looked at the transmission dipstick to find out it was milky.

I had the truck towed home immediately.

I drained the pan and the torque converter. I serviced that transmission 2 months ago, replaced all fluid. I also had the radiator rebuilt that same time.

I suspect coolant has leaked from the internal transmission cooler in the rad. I pressure tested the cooling system and it holds pressure very well.

I couldn't find coolant contamination test strips in my town, so I have to way to test this fluid.

I live in a dry climate and I do not drive through water.

Does it look like coolant mixed in?

I'm replacing an overdrive sprag on a 5R55E, I don't work on automatic transmissions very much. I noticed the thrust bearing surface on the planetary seems quite rough, and the needle bearings are also rough.

Should I replace the planetary or just replace the thrust bearing?