4 wheel Low, but no high in 87 Chevy

[jokershockey29]

Hey everyone, i have been shopping for a while for a winter truck and i happened upon a friend who knew someone with and 87 chevy for sale. I went and looked at it and couldn't pass up the truck. He said the 4 wheel drive works, and I can't seem to get it into 4 wheel hi. It seems to go right into 4 wheel low, but i don't get anything in 4 wheel high. Anyone have any suggestions as to what the problem might be? I bought it for the snow, and well its not very helpful without 4 wheel drive. lol.