hello my pickup seems to be lettin in water through the back any ideas where i should seal

yeah, the rear bulkhead is formed in two pieces with the upper section overlapping the bottom bit and iirc they are only spot welded together, i've been trying to work out where the water is getting in from on mine and the only place i can think of is through the vents that are just behind the b pillar to the sides of the seats

i found the two rubber drain tubes in the pickup bed where blocked in mine. and the water was just sit on the back of the cab when on a hill and seeping thru.

lay some newspaper down in the cab where you think its coming in. wait until after it rains then see where the water is on the newspaper