One of the driveshafts was not seated properly in the transmission, maybe from install I can't remember. See if you can spot which it was.

I took out the shaft, tried to replace the circlip which was deformed however no one could order the part in not even the manufacturer. So I reshaped the original circlip, mounted it properly, refilled the transmission fluid and it hasn't been a problem since.

My transmission can sometimes be a little difficult to get into first now. I think it is because the cables coming from the gear stick is missing one or more of those little rubber and metal rings they I couldn't identify where they came from.

Thank you again for all your help. It is so nice having my gear working again!

 

Thanks for allowing me to offer some assistance. You did all the work and it's a nice feeling when all goes well !