i think its just the product unless you doing your imitation of the duke boys , lol i had the door stops do the same thing and we bought soft seal ones the came in the weatherstrip kit , all you can do is replace them

 

No “ye-ha” jumping with my ‘68, in fact not the slightest bump in the road that would compress suspension that much, Lol

 

I wonder when they got made if they had a bad batch of material and it was just not as compliant as new factory originals ?.

If another set does it from the same company, maybe try a different brand ?.

Jim

 

Just got off phone with NPD, ordered up a new set. Will try to remember to post a follow-up here after these are in for a while. I don’t remember where I got the previous set, but I was able to confirm on call they were not from NPD.

 

Just made in Chyna shiite.

 

Those are going to be a bit of a bear to install on the car. I suspect they failed when the car was on a a lift or a jack with the suspension fully dropped.

If your ride height is not high you can likely get away without them.

Don

 

Agreed, it wasn’t too bad to install previous set when coil springs/etc were out & everything was out of the way. My ride height isn’t very tall in front (pic from parking lot at work), so if I can’t install the ones I just ordered “on the car” then I guess I’ll ride & see.

 

This type of activity could be responsible.