Today I decided to replace my transmission fluid (manual), so I bought 5 qts of red line mt-90 (my previous fluid was lucas 75w90, GL-5).
So, I jack the car up, unbolt the drain bolt (at least I thought it was hehe), and let it drain).
Now, I think I removed the wrong bolt because:
1 - Only 3.5 qts came out, as I learned by refilling it.
2 - A small spring and a metal ball came out on the oil
Will my transmission die for mixing fluids? What is this small spring and ball supposed used for?