MTD Lawn Tractor won't go into reverse or forward.

MTD/Huskee acts like it is in neutral. Won’t go into reverse or forward. Pulley on transaxle is spinning. It is a 2012 LT 4200. Should I open up the transaxle?

Update (04/28/2019)

Opened the transaxle and it is the clutch collar that is worn. I will also replace the detent shaft assembly because it is probably worn as well.

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Playing with WD40 and oil, got it to go into reverse, but it stays in reverse while shifter is in forward, neutral and reverse.

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