re webbing seat belts

[TKCR]

Originally Posted by kglowacky

can someone confirm if 1978 seat belts lock up on impact. I just installed mine and the shoulder belt doesn't seem to lock up when you yank on it BUT the lap belt does. Is this correct or are my belts not functioning correctly? thanks

These belts don’t have ALR, only ELR. With ELR, they will lock with the rapid deceleration, or slamming on the brakes. So sitting in the truck and yanking on the belt will do nothing, that function only works on the newer belts with ALR.
And the lap belt is just bolted to the floor of the cab, it doesn’t have any quote functions, other than strapping the center occupant to the seat.