Is there something missing on my Automatic Transmission?

[gerster]

I wonder if there is something missing on my Automatic transmission, I have troubles with it, it shifts very roughly when speed goes up, specially from 2nd to 3rd the tyres are slipping through and from 3rd to 4th I have to go to about 110 km/h before it goes to 4th. 

[clabelle05]

You are missing the Vacuum line to intake, it follows the dip stick up to engine compartment and attaches to the bottom back of intake

[gerster]

Thanks for you'r reply, do you know if it is important?

[ctaylor738]

The missing line allows the modulator (the piece with the the threads on it) to measure engine load and throttle position, which in turn controls at what speeds the transmission shifts.

It may have been removed because the modulator is bad and allowing trans fluid to get sucked into the engine.  You should check and see if it holds vacuum and replace or repair, and then have someone adjust your modulator pressures.