I had a B&M pan on another vehicle years ago. It was a good pan never a problem with it, however I put a MagHytec on my truck recently and they don't even compare. The MagHytec is definetly a higher quality piece imho.
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2001. 5 2500HD, SLT, 4X4, QC, LB, Dark Garnet Red, Auto, 3:54's, LSD, Tow pkg, Camper pkg, Amsoil dual bypass w/billet adapter & SS lines, Amsoiled, Smittybuilt side bars, Mag-Hytec Trans pan & Diff cover, Line-X bedliner, Triple SPA's in the A pillar