Got her into the workshop, and stripped out the engine.....
Then I saw what I did not want to see...
The ring gear has been chewed up, and the starter bush has disintegrated.
So then we get to the reason WHY.

This "100% working Gearbox, I know its perfect" has a starter bush hole the size of my arm.... Its been peened over a number of times to try make it smaller, and this at double the going rate, I ask you, do you need Friends like this.
OH while I am at it, it jumps out of 4th as well......

Anyway had to make a bush to bring the hole size back to STD, and fitted a new Bronze starter bush.
Also saw that 2 of the 4 new CV boots are broken, .. (can one not buy anything decent any more)
Now I have taken off the flywheel, and having to put a new ring gear on, or if thats not obtainable in SA, I will need a new flywheel.
while the box is out, I need to address the 4th gear slipping out problem, and fit a new Thrust bearing.
Who Has decent CV boots, maybe these new neoprene ones, not sure how long they work.
OK till its fixed....
Herman