Since the u-joint is enclosed it runs in oil and is protected from the elements and road debris. When it is properly maintained, u-joint failure in a torque tube system is unheard of, unlike the Hotchkiss drive (open driveline).
-Tim
'51 Chevy 3104 w/'56 235, 848 Head, HEI Dizzy, Corvette Cam, Split Manifold and Dual Carter YF's
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