So I learned what happens when ya loose the belts on a hydroboost truck at about 90.... Quite an eye opener. I had my foot on the floor rying to pass a big rig, about 5500 rpm is when the belts cried "UNCLE!" and hung it up. On a side note....Horse power is soooooo nice! I think the 454 more than doubled the hp/tq of the old 6.2. I can't stop grinning and I can't keep my foot out of the 4 barrels.