I have a 1995 Tahoe 4x4, it had been sitting for a week or two I let someone test drive it down the road and he was found on side of the road saying it won't move. It seems to be in neutral and won't take any gear and it grinds when I try and put it in park. Any idea what could be wrong? Thanks

Park, so this is an automatic.....

Can you put it into park with the engine not running?

Check fluid level?

Were you selling this and the potential buyer was test driving it?

Yes it will go into park not running and it will go in park while running just has a clicking sound. I checked fluid it all looks good not dark at all and full and yes it was a potential buyer

If it is 4WD, did he put the transfer case in neutral?

I'm wondering if he did something trying to put it in 4lo while it was still moving.

When park does engage, does it actually hold the truck?

My thoughts also go to the driveline being disconnected or transfer case stuck in neutral. Is it push button 4wd, or a mechanical selector? If park isn't holding the truck, I would focus on the transfer case.