which fluid?

V-drive and tranmission are the same thing.

Not necessarily………. in Sea Rays with earlier high hp/torque applications like Detroit Diesel engines in 50+ ft boats. We have had several 50DA's in our marina for service in Panama City Beach with Engines coupled to ZF/Twin disc transmissions and the transmission output coupled to a seperate V-drive to get the correct down angle and direction for the prop-shaft……….those things must weight a ton, but they perform well.
 
Not necessarily………. in Sea Rays with earlier high hp/torque applications like Detroit Diesel engines in 50+ ft boats. We have had several 50DA's in our marina for service in Panama City Beach with Engines coupled to ZF/Twin disc transmissions and the transmission output coupled to a seperate V-drive to get the correct down angle and direction for the prop-shaft……….those things must weight a ton, but they perform well.
fair enough.
 
Not necessarily………. in Sea Rays with earlier high hp/torque applications like Detroit Diesel engines in 50+ ft boats. We have had several 50DA's in our marina for service in Panama City Beach with Engines coupled to ZF/Twin disc transmissions and the transmission output coupled to a seperate V-drive to get the correct down angle and direction for the prop-shaft……….those things must weight a ton, but they perform well.
That's crazy, never heard of that configuration in a Sea Ray.
Gotta be "ton's" of weight. Can't begin to imagine the DB's of those Detroit's in the ER under full load.
 
My '92 44 Dancer had the same setup, hooked to 3208's. More common than you realize.

If memory serves me correctly, 80w/90 went in those. Here are a couple of old pdf's for you, if this helps.
 

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