Besides transmission failures the shape has caused major problems with hydrodynamics. Why do you think Fountain will not sell a new boat with nxt drives.

I believe the Fountain handling problem is due to the higher X demintion they use. Cigarette on the other hand has not had that problem but they have lowered the X demintion a bit.

That said, you can get the NXT drive with a #6 lower. Other than having to change the water pickup that is a nice piece of equipment.

Donzi and Formula havn't had problems as well. Outerlimits on the other hand will only put #6's on their 39's with 700's.

The problems have depended on the hull and X demension. Each manufacturer has had a different experience.