2006 Yamaha Lower unit

[Drfter]

Help needed...I have a 2006 115/80 yamaha jet pump. I am looking to change over to a prop. I have found a lower unit off of a 1999 100hp yamaha and was wondering if these two are compatible.
Any information or maybe somebody knows who i would contact to find out would be greatly appreciated.
thanks

[boats.net]

No the F100 gearcase wont work on a 115 2 stroke or 4 stroke model.