My wagon started doing this after I replaced the transmission mount. I had new bushing already in from earlier last year and park always worked well. I think with a brand new mount, the linkage is a little off and needs to be adjusted.

If I push forward on the shifter. it locks into park, but won't stay there.I'm not looking forward to working in the tunnel again, so this is on the back burner at the moment.

Parking brake still does its job.

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'85 300TD "Puff The Magic Wagon" - Rolling Resto
'19 Mazda CX-9 Signature - Wife's sled
'21 Morgan 3-Wheeler P101 Edition
'95 E300d - SOLD
'84 300TD "Brown Betty" - Miss this one
'81 240D "China Baby" - Farm grocery getter