I recently noticed my shifter has a lot more movement than usual especially accelerating in second and shifting to third. Could worn rear differential bushings, transmission mounts or even both cause this? I have already changed both engine mounts.

 

Any torn or worn bushings could allow drive train play.

Check all transmission bell housing bolts, check linkage bolts and anything connected. Also check all bushings. Also make sure you installed your engine bushings correctly. Did you install stiffer bushings?

Could just be more feedback if its a solid or harder compound.

 

I had my motor mounts installed about 11 months ago, and I will check everything you said. Thank you