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definetly change the bolt and washer, i believe thats the main problem on the HB, not the acutal HB itself, my bolt snapped and the weird part was my balancer didnt fall out (it was in 2 pieces), but my rpms where jumping around every now on the highway that night on the way home of me driving and then on the highway, i kept driving home on the higway to my house, next day my brother (my mechanic) this all was a couple yrs back, he looked at my balancer and the belt and said WTF ? he pulled on it, and it came right out with his hands HB broke 2 pieces, 1 piece was still left inside and i guess the bolt head was gone with washer, then used an easy out on the bolt out of the crank and it came right out...so i bought a new HB from ford and also a bolt and washer...i will upgrade to a ARP bolt + washer when i get the jackshaft pulley and BHJ balancer later on.(when i have extra funds). to me the ARP bolt + washer is the Fix for the HB failure Alex LaChance