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The TH350 and its heavy-duty brother the TH400 have excellent reputations for strength and reliability. The TH350 can be built to withstand just about any horsepower you can throw at it, and the TH400 is a stout performer right out of the box that was used in many heavy-duty applications. A TH350 is plentiful and cheap in practically any wrecking yard, and it was used behind many different Chevy transfer cases. The TH400 may be more expensive and the 4x4 versions are harder to find, but its bulletproof construction makes for an excellent candidate in a severe-duty application.