Suzuki 2002-2005 DF4/DF5/DF6 4-Stroke Outboards Service Manual, Page 139Get this manual
8-18 LOWER UNIT FORWARD GEARPINION GEAR SHIM ADJUSTMENT Adjust the forward gearpinion gear shimming as shown belowStep to prior to adjustment 1Install the following parts to the gearcase Forward gear bearing (if removed) Forward gear backup shim Forward gear Pinion gear thrust washer Pinion gear backup shim Pinion gear Driveshaft lower washer Driveshaft (with two circlips) Driveshaft support housing gasket Driveshaft support housing
2Install the driveshaft support housing with the two nuts diagonally