I chewed through 2 of the 4 Grade 8 bolts connecting the driver-side ladder bar shackle to the axle tube on my Monte Carlo. It's a stock 3.27 rear, but the 402 has been massaged to put out around 375 hp. I was pretty stoked until I realized the shackle was somewhere on on Rt 49 in Northwest Indiana. It cost me over $200 to have a machine shop make me another one.