Are you talking about the gap between the door and the rocker panel? This is quite common and I wouldn't speculate on the cause. To seal it just buy some thicker weather seal and glue it on in that area.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!