Re: Help. 1971 C10 4x4. What is the bar under the front differential?
Not a C10 but a K10 (4x4) If vin points to C10 it is a put together truck. That is called an axle truss. It meant to reinforce the axle and prevent bending of the axle tubes. Yours looks a little bent on the drivers side. Hard to tell but also looks to be somewhat of a custom job as the end mounts appear to be welded to the axle tube.
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