my 96 has what looks like 2 cants too. i would check for lose bolts too while your down there. when i first bought my truck it would make a rattling sound because the bolt for the heat shield on the cat was broken and rattling.
1997 f250, HD XLT 7.5l/460, 4sp auto/OD, 4x4, extended cab, long bed, 138k miles.
1996 f150 XLT, 5.0/302, 4sp auto/OD, extended cab short bed, 107k miles. TOTALED
1998 ram 1500, SLT Laramie, 5.2/318, 4x4, with 4sp auto/OD, quadcab, shortbed, 147k miles.
1992 f150, XLT 5.0/302, 4 sp auto/OD, extended cab, short bed, 107k miles.