Re: have lost forward 35hp
Your problem is that the drive dogs on the forward gear or clutch have worn beyond use.
SOMETIMES if the dogs on the gear are not too bad, you can gain al little more service by reversing the dog clutch. The reverse dogs are exactly the sam, and get much less wear than the forward so are usually in better condition.
Ultimately though, you are looking at replacing the dog clutch and the forward gear. Cheaper to buy a used lower unit on the auctions.
It would be nice if you told us the year and make of the engine.