Haven't done the package tray myself, so I can't help you there. But, I have used 3M Weatherstrip Release Agent with excellent success. I got mine from Year One, part number 3M8971, but I'm sure you cand find that at your local auto store. Can was $13.
to remove the package try you need to remove the rear seat, the rear side panels, the inside rubber trim around the rear window, the metal trim that runs along the roof line, the rear sail panels and the 2 plastic corner pieces on the lower inside of the rear window.
Remove the seat and back. Remove door cards from rear. Remove sail panels(sometimes called earmuffs). PK tray may have a strip of vinyl sttached to metal below shelf. Peel this up and slide tray out. To install, reverse process.
69 Cortez silver SS 427
69 azure turquois Malibu 250
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