I have a 1997 k3500 6.5 diesel 4wd
Had no abs light on but I would get a low speed pedal shudder from the abs when breaking,
Replaced the front hubs they came complete with abs wire "Moog"
Road tested truck still had it did some research replace the VSS sensor on the t-case
For those who don't know that's the rear abs some are on the rear rend diff but these ones are in the t case and run off the speed sensor
Problem solved no more abs shudder.. Mph worked fine that's why I ruled that out first time...but a $56.00 part was all it was! Food for thought I know these trucks are a dieing bread but reason being I did alote of research and no one gave an direct answer so here you go!