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Replaced Lower unit on 115 w/90 different gear ratio. Lost speed, gained rpm's

Applesoss

New member
Anyone have any suggestions on what size prop I should go to? The current prop I have numbers are
48-72760-23 and I have it on a 18 Grady White. The lower unit went out and I found this 90, but the gear ratio is obviously different. I was running 42 mph at 5000 and now 37 mph at 5300. Thanks in advance. Jeff
 
Need model#s and serial#s,year for the lowers.
Any Merc dealer can tell the size.
Go to the prop section?Sorry no prop section this forum.
I boats has a prop section.

Someplace on the prop should be more #s???
 
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