rear door squeak

I have a squeak from the rear doors in my 99 2 door tahoe when i hit bumps. I dont know what the hell is making the noise. Its really annoying though. Its louder when it rains, but is definitely always there. All it takes to make the noise is a tiny bump in the road, so its pretty much constant. I think I've sprayed everything with wd40 but it wont go away. I had my brother sit back there while i drove it around and it would stop making noise when he pressed on the doors. Anyone had this problem before or have any ideas.

I have a squeak from the rear doors in my 99 2 door tahoe when i hit bumps. I dont know what the hell is making the noise. Its really annoying though. Its louder when it rains, but is definitely always there. All it takes to make the noise is a tiny bump in the road, so its pretty much constant. I think I've sprayed everything with wd40 but it wont go away. I had my brother sit back there while i drove it around and it would stop making noise when he pressed on the doors. Anyone had this problem before or have any ideas.

wash the rubber thoughly with dish soap.....see if the squeak changes...I then use silicone grease on the rubber and wipe off excess....also make sure the metal painted surface is clean and smooth [not rusted]...if all this does nothing it may need to be adjusted at the post for a proper close ..