Transmission issues

Hey fellas,

I am stumped. So about two days ago I had a idle issue for a while where it was idling around 2500-3k I got that fix but we all know that means I was having shifting issues and grinding because the belt was never stopping. So I got all that worked out and I now have no reverse. I pulled the transmission out to see if it had spun a gear or something but that proved not to be true. Then I thought maybe something in the rear diff but I saw it spins the driveshaft when put in gear. I had a mechanic tell me if was the shift rod. I don’t know if I’m buying it and was wondering if any of y’all maybe had another idea. Thanks in advance!