so last week i put clearance lights on my truck(wich look badass) and the other day it rained for the first time so of course im looking for leaks everywhere, turns out i have a leak in the rear window area, edge of headliner and rear seat is damp, anywhere it could be leaking from other than the rear window seal

o yea its a 01 extended cab

 

Take off your 3rd brake light and check the seal. This is a pretty common area for water to get it if your seal is worn out.

 

where exactly is the seal under there