Does your Jeep? have that annoying rattle or thumping sound that you can actually feel coming from the floorboard through your feet when you hit bumps? Have you tried tightening every suspension component you can find to no avail?
"Bar Pin Eliminators" were designed to eliminate this very issue.
Because of the OEM (Original Equipment Manufacturer) bar pin design on the lower end of your front shock absorbers there is no compression (preload) on the bushing, which allows the bushing to move freely within the shock loop eye. Because this allows the suspension to act independently of the shock for the first 1/8" or so before the shock can respond, it allows the axle to slam into the bushing, causing the sound you hear and thump you feel. This symptom will only get worse with time as the bushing slowly deteriorates from the OEM bar pin slamming into it over and over again.
"Bar Pin Eliminators" preload the bushing to the desired dimension specified by the shock's bushing manufacturers. Compressing the bushing in this fashion actually preloads the bushing in such a manner as to fill the shock loop eye completely. Now you've eliminated the rattles or thumping noises associated with your shock bushings. I've used these for three years now, and I'd do it again if I had the chance. If you have thumps over bumps, this is the best money you can spend!
Also, the "Bar Pin Eliminators" increase the shock extended and compressed lengths by .400", which is good if your shocks are too short, but could be bad if you are running shocks that are too long for your application.
Comments: I had a suspension sytem that was only about 5mo old but the bushings in the shocks didn't look like they were holding their position in the shock head. I installed the bar pin eliminators and the suspension was notably more responsive. For something so simple the money spent on this product was worth the feel and improvement of the suspension. I also want to guess that the start of spotty patches on my tires was a result of the shock moving around. (Similar to what you may experience with shock failure).