Faun Frisch F85 Grader

I do a lot of work here in the west of Ireland using a Frisch F65 grader. I would like to get a good Faun Frisch F85. The problem is that these machines were fitted with Voith transmissions which were not great. I used to have one back in the 90's. I heard that the later models of these machines were fitted with ZF Transmissions.
Is this true?
If so from what year?
Or from what serial No?

Thanking you in advance Mike

Faun Frisch F85 Grader