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It was caused by the shock going farther out then it should have. With the shock apart interally it was going past the factory shock stop and hitting the limiting strap.
I am with you on the solid top out spacer though. This is how I set My shocks you as a last ditch survival stop. A lot of the older shocks used to come this way before limit straps were common. I think the cost of the extra parts made them disapear......
I still don't understand.
Also, even if the back stop washer bends it's thickness and the pre-load on the shim pack and nut shouldn't changed. I would have to say something was not assembled correctly. I have had a strap fail and eventually the shaft ripped the seal head out of the shock, but never had a nut come loose.
With the hold down nut not on the shaft, that caused the valving stacks and piston to just flop around in side. Those parts weren't doing what they were to do. So with 415 PSI push in shaft out and the oil not doing any dampening, it pounded against the limiting strap. Does that make sense to you guys now.
Ok so if this happened the limiting strap still SHOULD have held its length reasonable enough. The 415 PSI was only acting on the end of the shaft in a pushing manner to since its a small surface area theres force there but not major amounts. Only the spring that holds the car up was pushing out on the strap. Be it likely repeatedly and fiercely. I dunno. Still seems like the strap was defective?? I still do not see how the strap (If correct) let it hammer the piston enough (as you said it did ) to damage the washer and let the nut loose!Even if the nut simply fell off inside the shock the strap should have held the suspension together it seems so that the shock never over exended. Weird. Seems you would have felt it hitting REAL hard on that corner with no more shock action. Even a couple few hits would have made it ride/handle funny.A strap should be able to take that in stride if its A-OK. I would think so anyways.