what are the different ways to confirm my problem is the shifting solenoid and repairs

Hello, grinding noises sounds like an internal mechanical concern - not so much a shift solenoid "command" concern. Hands on testing is needed utilizing a diagnostic tool, checking fluid condition, evaluating transmission shift performance, and monitoring data all the while. I get the lack of money part, but there's no answer to attain without professional testing hands on. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops