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Originally Posted by future2010camaroowner
Do you mean the c-channel frame? I thought most heavy duty trucks use the c-channel instead of the fully boxed frame?
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Fully boxed frame is stronger and more heavy-dity than open C-channel. The F-Series, GMT-900's, and Ram all use fully boxed frames. Most are also hydroformed, which makes them even stronger in critical areas.
The Tundra uses an open C-channel frame, which is much weaker and prone to flexing. When driven on washboard surfaces, the Tundra's bed has been known to make contact with the cab due to the flex in the chassis. Its a pile of shit.