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It is a transmission problem. Had the same problem a few years ago and had to have the transmission rebuilt. I put it off for a while by not parking where I had to back up and if I had no choice, I put it in neutral and was pushed backwards until I could find the right person and price to get it fixed! Good luck.
This is kind of normal. All of the weight of the car is resting on the parking lock. when parking on a slope first engage the parking brake then put car in park. This will take the load off of the parking lock in the tranny. when leaving put car in gear first then release the parking brake. I hope this helps.
Your sun gear shell (google it) has broken in your transmission. I'm guessing you only have 1st and 3rd forward gears? I have a 98 Z-71 and have been through 3 of them. The OEM shell is junk. When you take it to the tranmission shop, tell them to replace it with a hardened shell. My local transmission shop charged about $450 (parts and labor) to change the shell only. The very first time it broke (about 65,000 miles) they went ahead and rebuilt the tranny while they had it apart. If you've never had your tranny rebuilt, I reccomend doing it while they have it apart - they probably will, too. I have the advantage of knowing my mechanic since I was born (small town). He is as honest as they come and this was his suggestion.
Since he put the hardened shell in mine, I have had no problems.
how many miles on trans? does fluid smell burnt?350 turbos are good tranneys but they do go bad. in my experance its reverse that goes out first on thies transmissions but thats not saying that it does not happen the other way either. my best guess is you need a rebuild. when you say it tries to move in forward gear that tells me that the clutches are shot. 350 turbos are worth rebuilding. its up to you.