Hi Flinty, welcome tot he club

This one is fitted with the ZF auto gearbox. before buying this we also tried an alison box, but were not impressed, the alison seemed slow and sluggish at changing gear. Zf is also a famous brand for being strong. in the end we went with the zf, just because of the feel of it, it was quick to react and had a much firmer feel about. the ZF also has a water cooled retarder on it, and a pto, although i think the alison will also have a pto as well.
Do you have an 1124?
Cheers, Brian.