Originally Posted by math

oh okay, they look the same to me

w123 4 speed manual.

I was using ATF, before putting the box in it's place inside the car, i had it on it's side and filled it with ATF ( maybe too much ? ), not sure what type though, i thought there was only 1 type ?

Here's a link to what i used

https://www.castrol.com/en_au/australia/products/cars/automatic-transmission-fluids/atf-dex-iii.html

The grinding synchro issue is only when trying to shift into 2nd gear. 1st, 3rd and 4th are fine.