What is this tool?
 

The in-laws picked up a '79 C10 that needed some work the other day. I found a Mac test light under the battery tray and this other tool under the seat. I have no idea what its for. Looks kinda like a tie-rod fork but all the ones I have seen you hammer on the back to get it to break the t-rod apart. This thing, you can't hammer on. Anybody have any ideas what it is?

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Re: What is this tool?
 

I'd say you're right. It looks like a tie rod/ball joint separator.

Re: What is this tool?
 

As mentioned, its a joint seperator (pickle fork)..my guess would be its one designed to really allow leverage based on the length of that bar, and the fact that one side is offset/cupped. I can't see another use for something with the little half-circle leverage point like that.