If you look at the shift linkage back up top you will see a retainer clip. Pull that clip and push the shift lever toward the port side of the engine. Be sure to support the gearcase while you do this. The clevis pin will release the top of the shift rod and then the gearcase can be dropped. Going to try to send you a link for you to look at.
#87 is the clip & #69 is the clevis. Hope that helps!
Dan in TN
