Thanks for all the help guys.
The "new" gearbox is in and working, however I have a few questions:
1. The new box did not have the two little solenoids or what is is on both sides, they were just plugged in the covers. (On L/R side front) I mounted the ones from the old box.
2. The gearbox number was the same, but the filters were different.
3. Downshifts are smoots, also 3-4 gear is ok, but 2-3 is very fast and a bit rough, even if I let go a bit of the gas, it makes no difference. I have tried turning the rod in / out a bit, about half-whole turn in each direction, but it doesn't do the trick. In the Installation guide from Sun Valley a vacuum line is mentioned to the gearbox, I have not seen such a line I believe!
I hope you can help me with these last snags.
Cheers
Mike