Old Town PDL Drive. I have some Qs ???

Hello
I have a brand new PDL Drive By Old Town .
Today I took its for its maiden voyage today.

It feels heavy as if im on a bicyle going uphill
In a low gear .  Its sort of uncomfortable.

Its defineatly feeling heavy .  Im moving thru the
Currentless glass like no wind lake.  Can defineatly
Hear the pinion gears meshing with one another.
Very stiff.

Im hoping that its just needing break in time and will
Lighten up.  Is there anyone who has any experience
With getting these drives too loosen up a bit ?

Rear Diff fluid .

Yours Mooshue 5000...