Will I need to change motor mounts if I put a tcase drop in?

 

No you won't but I still would not suggest the drop. With a sealed out put t-case like you have you can do a SYE for under $100. Why crack a case on a rock and be out 175 for a used case when you can just do an SYE for under 100? And it is probably not even 100. Junk Yard yoke and drive shaft. Cut, drill and tap the out put shaft then a bolt and a washer. Buy me that's closer to under $50.