lower unit "buckling" sound

[CALVINIST]

I have a 35 horse johnson, mid-eighties model. Anyway, I have noticed when I am throtteling up, there is a buckling sound, that apparently comes from the lower unit. It usually does it only once or twice while throttling up, then no more. What could this be? It sounds like a gear is not going into place when it should, then does. I have also noticed that throttling up slowly has lower incidence of happening when throttling up fast. How much would it cost to repair?

Thanks!

[Chris Stolp]

It may be as simple as adjusting the shift control. If there is any adjustment on that engine I would check that out first.