Alright guys I need your help. The other day I replaced my impeller on my 1995 mercury force 40hp due to overheating issues. Before I replaced the impeller it shifted perfectly fine. Now when I shift forward it's smooth, no grinding and locks in good but when shifting into reverse there is now a little bit of gear grind and even more when going back into nuetral. I'm assuming I need to adjust the shift linkage but to be honest I'm not sure exactly how. The linkage has a stopper nut on the lower unit side of the linkage and I just tightened the upper linkage down like it was when I removed it. Could someone walk me through exactly what I need to do. Probably something simple just having one of those moments.