quick question for anybody with an auto TH350 trans

[Lil Ape]

How does the gear selection order run? Like is it supposed to be P,R,N,D,1,2? Reason i ask is because I only have two selections for a forward gear, like P,R,N,2,1, or P,R,N,D,2, when i believe i should have three. And it feels like to me that the truck isn't shifting into 3rd, even around 50 or 60 mph. I don't have a selector indicator on my dash so I go by feel. The truck didn't have the shift linkage hooked up, had a mechanic do it with parts he had laying around. And it works well for the most part, but i feel i'm supposed to have another gear selection on the column.