Opening the gearbox

Took some pictures while we opened the gearbox and struggled with the fifth gear

E50? What the fuck?

Fifth gear wont come off

Finally, the original open diff

My gearbox serial. I found some info about toyota gearboxes, specially decoding the serial. The first number says the year the gearbox was made, which on my box is 8, so => 198(8). The second and the third number should be the month, so again 02 => February. Rest of the serial is just a running number.