I need to replace the gearcase seals on my 1984 Johnson 35 hp. I have the lower unit off and in my garage but not sure I have the right eqpt and know how to replace the seals. Can you recommend someone in the Cincinnati area that is a reasonable price? I am pretty sure it is the drive shaft or shift linkage seal because the oil gets contaminated even if run on muffs. But I will probably have all 3 replaced.