The part that is riveted to the frame is commonly called a spring hanger. Inside the hanger is where part of the shackle (red arrows) is pressed in. When you say the threads are missing, it is hard to understand which part you are talking about unless you provide a picture, which is always helpful.
Last edited by buoymaker; 04/03/202211:45 PM.
"Adding CFM to a truck will only help at engine speeds you don't want to use." "I found there was nothing to gain beyond 400 CFM."