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Once the transmission is bolted to the bellhousing, the gearbox can be supported with the custom Keisler crossmember. Even with the exhaust in place, the fully boxed crossmember slips in more easily than the stock TH350 piece did. It uses a standard GM-style trans mount when used with the PerfectFit custom tailhousing. We upgraded to a Lakewood polyurethane mount and bolted it all up with the provided hardware.