Quote Originally Posted by Moncha
Are you sure it's the back door? You can adjust the little "V" wedge that is on the sill side of the door jamb. I had a rattle and adjusted the wedge to tighten up the latch.

Now, there is another problem with squeaks. It's been well documented but, what may sound like a squeak coming from the rear, actually is coming from the little square rubber pads that line the sides of the front fender under the hood.

So, first, before adjusting the wedge, use a good silicone lube and hit the little pads on the front fenders and see if that gets rid of the problem then go from there.
Yeah...what Scott say...also, on mine I found the hood hinges & the latch were also squeaky culprits.
Silicone the hinges & clean the latch of all old grease/dirt & lube w/ some fresh grease.