I recently purchased a Clymer official shop manual for evin/johnso 48 - 235 hp year 73-90. I have a johnson GT100 that I think is a 1990. The mod.# is J100STLCEM. I want to remove the lower unit to change the impeller but I can't get the lower unit off. I followed the manual exactly. The problem is that I can't get the shift rod free of the assembly in the top half of the motor. I removed the shift rod retaining clip but I can't see how the shift rod comes out. I had the motor raised up fully one time and tried it lowered just about all the way down other times. Does the shift rod come out from the lower half? I have sucessfully changed three impellers before but they were on smaller motors and it was a long time ago.