Shifting question
 

I had my engine replaced in late July and it has been so nice. But I have a question that I'm not sure could be related to that. Since the replacement, I get a grinding every time I shift into 4th above 4000rpm's. This always happens. (If I shift it with a lot of force in a quick manner, it will usually make it into 4th without the grind). Is this anything that could have been affected by them when they swapped the engine? If so, I definitely want to take it back to them.
Thanks in advance for your thoughts.

Feeling your pain. My engine was replaced at about 13000, now have 40,000 more on it and i have the same grind. If i let it slide in without force it slips in just fine. I dont think it was from the swap, maybe a synchro went bad in the tranny...idk. Anyone else have 4th gear issues?