OP, we know you are not a car enthusiast, and must be hard to try to speak mechanic's language. However, you asked for advice and there is none to be given without any further detail. Please find out what's wrong with the engine. There are many "internal components" in an engine. There should be some paperwork given to you by now, stating the details.
"Money shift" refers to shifting into a wrong gear causing rpm spiking past acceptable range. Google is your friend
Ps: if your post history was given to the dealership, you wouldn't have gotten the tranny for free.