Everytime I hit a bump or even a road reflector on interstate the rear hatch plastic and some behind the driver seat rattle like crazy. what solutions do i have? im thinking of putting in some dynamat when i do my stereo, would that help?

 

Dynamat or some kind of insulation may help, the blazer is notorious for interior noise.

 

Yeah dynamat should help, otherwise making sure there is like some insulating foam at the edges of the panels would be another good place to start (making sure everything is tightened down will help too).

 

The rear hatch cover is held on by those nylon push-pin thingies. If the cover has been off a couple times, they might be distorted enough to not keep the cover tight. You can buy them cheap at any parts store. That adhesive backed insulation foam suggestion is a good idea.

 

edead did not help much with my rattles....worst part of a blazer/jimmy imo.

I just jammed sh*t in places, helped a little.....