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Gm Hd Truck Frame Illustration

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The frames under GM's HD trucks are now fully boxed. There are more crossmembers between the main rails, and now all crossmembers are welded in place. (Previously some were bolted or riveted.) Larger engine and transmission mounts help control unwanted drivetrain vibration, while hydraulic body mounts under extended- and crew-cab bodies isolate them from road irregularities.