SAP27610

My name is Shane and I am new to forums so I hope I am posting this in the right place. I am also new to manual transmissions and my "new" truck has one. When I bought it the seller told me the forth gear synchro was bad. I bought the truck anyways cause it was cheap and he showed me a trick to get it into fourth without scraping. What he did not show me was how to downshift into four without scraping. Does anyone know how to do this? Thanks for the help!

Just played around with it some more and realized that this is not the right place to post this so I moved it to the truck area. If you know the answer could you post it their. I'll just keep this post up to introduce myself.