BMR Fabrication 1993-2002 Camaro and Firebird - 4L80E LS1 Conversion Tired of breaking that overdrive transmission? Want to get rid of your 6 speed's drag race inconsistency? These tubular conversion crossmembers allow you to swap in the popular TH400 or Powderglide transmissions in place of your OE unit. No welding or drilling required, just bolt up to factory mounts. Available in Black Hammertone or red powdercoat.