Technical Seicento - Frankenstein inner CV joints ?

[eolonano]

hello,

I took off my gearbox, the differential gear bearings are completely shot.
I found a new gearbox that I think is perfect (very low mileage), same of mine (dry box).
The CV cups (or pots) are already installed, and they can be better than mine.
Can be a problem to do a mix up a cup and a tripod bearing that have not worked together (different wear)?

And by the way, what amount of play can be considered acceptable?

And last but not least, I have an EP - nlgi2 grease right for the joints, but what I have to do? replace the old grease? add some?

Fiat says 0,08kg per joint......

 

[blu73]

to be honest, you may as well just buy new spider bearings if you take it apart, they aren't expensive..