2005 SO Johnson 4 Stroke 9.9-15HP Outboards Service Manual, Page 211Get this manual
GEARCASE ASSEMBLY Install the cirCip above the upper driveshaft bearingInsert the push pin and push rod into propeller shaft
1Circlip
Check that backlash exists between the pinion gear and forward gearRefer to SHIMMING ADJUSTMENTS on p213
Forward thrust washer Reverse thrust washer Reverse gear Reverse gear back-up shim Propeller shaft housing Push pin Push rod