My first bad shock was the rear. The sound was much louder than the fronts and there was zero compression dampening. Replaced that one and has been fine ever since.
My two other failed BPs were on the front right (the replacement ARB sent clunked as well). Switched to Nitrocharger struts and clunk gone.
Had the front BP-51s clunking both before and after installing front bumper. Rear was before bumper but after drawers.
Hope this helps.
It does as always,
@mark71, you're always one of the best on here.
I was just thinking about how it sounded like more people with either stock bumpers, or less preload on the coil were talking about clunk more. But since you are having clunkin' (that's my new thing, "clunkin'") with both stock and steel bumpers, it makes my theory not work so well.
What I was thinking was about how the coil on the front of BPs is progressive by tightening the wraps and reducing the free height between wraps just at the bottom. On my last truck, I built this really fun long travel monstrosity that used a coil just like the BP-51 coil. It let me get tons of droop without a ton of lift, and part of the coil had to sit on itself.
Now when I would just drive around, I kept hearing this clunking banging sound. I couldn't figure out what it was, I was swapping out control arms, shocks, I even pulled my rear diff and put in by back up diff, still clunkin'. I eventually found it was the coil, when taking the bumps of driving, the coil wraps where hitting themselves.
So back to our BP-51,
@arich, you mentioned the truck sits a little higher now, even at 0mm of additional preload, and no clunk yet.
I cranked my preload to an additional 25mm of preload before install, and then went a few more. I like it rough (
@Markuson just giggled), but even in super cold I've never got a sound
I did notice when adding preload, the wraps at the bottom of the coil was what reduced. Since we know preload doesn't add lift by raising the coil, it adds lift my increasing spring rate, I'm thinking that with less preload, those wraps may be given just enough space to slap themselves and make an annoying clunk. And with cold weather, the shock has slightly less ability to slow its conversion down, and when people crank the adjusters to 10, it goes away, maybe because its not letting the coil hit itself?
I've been thinking about this because I found myself in an awesome situation a little while ago, having a beer with offroad industry guys, and sitting next to an OME engineer, and I know there were some changes to the internals, but I got the impression that really not much was done to the internals, then arich mentions the ride height and I though of this.
I don't know, just thought I would share, I'm probably way off.
