Possible tranny damage?

It's all stock, no shift kit or anything special. Wasn't doing this before it blew a cooler line, but it slams into gear now that I've replaced it and filled it with fresh fluid. Interestingly it only does it when going from park/neutral into reverse/drive, when driving it shifts 1-2-3 smoothly.

Idle seems a little fast, maybe 900-1000.