I have a 95 EB everything on the front end has been replaced. I have been chasing this popping sound for almost 2 years. What I've replaced so far....
Radius arms and brackets bushings both polly and rubber the noise remains.
Ball Joints, Tie rods Brakes
caliper rotors, Wheel bearings, premium warn hubs, shocks
, springs, insulators, Shock towers , motor and tranny mounts, Body Mounts, New U joints front axel and slip joint greesed, Axel pivot bushings, Ball Joints, professionally aligned, Spindel Bearings and seals. axel shaft u joints,
New rear drive line new leaf springs, brackets, bushings, u bolts sway bar bushings
This noise is a popping sound coming from the radius arms I have replace the bushings with both polly and rubber and the noise is still there
When I back up and hit the brakes it will pop and then going forward it pops again almost like its going back into place. I have check the bolts and rivets and they are solid and tight. Once it pops going forward I can do 40 hit the brakes and no popping, go backwards at 5 or better it pops and then when I go forward even at a slow speed it pops, and then doesn't pop again until I go in reverse.
To see if it was the springs possibly binding up they were removed and tried to see if she would pop and she did, going along side the truck and placing your hand on the radius arm near the bushings is where you can feel the pop. I have gone through and replaced the bushings and she does it.