Thanks, I think I was smelling the grease that came past the rear seal.
You mean grease that had been expelled from the PDS bearings?
The oil that came out doesn't smell or pour like gear oil.
I will be running it in a tank and will check transmission temp.
Running the engine with the drive submerged in a tank of water will not place enough load on the gears to create any substantial rise in transmission temperature.
The method for checking to see if the slinger pump impeller is OK, will be to pull the prop shaft and bearing carrier out. Once out, you will see the die cast impeller.
It must be indexed to the "driven" gear.
If it can be turned against the driven gear, the pins have sheared off.