the torsion bars and hex sockets are greased from the factory. if that wasn't done during a rebuild the only way to correct it is taking the bars out and greasing them. i've had popping issues before. in my case it was the the strut rod pivot point at the lower control arm. i didn't lube that point when i rebuilt the front ends on both my coronets. if i had it to do over i would use some type of anti-sieze lube on that pivot point. i've had fairly good luck using Rust-Check spray lube on squeaky-popping front ends.