Who knows Snap-On?

Hi Guys,

A few years ago I bought a box full of aviation tools and these two tools were in the lot.

Snap-On Part # S9580 is on both with the number 1 stamped after it on one and the number 10 stamped after it on the other.

Anybody have a clue as to what they are for? For a reference to their size they are about 6" long.

Here's a top and bottom shot.




Here's both from the top.

 

Chevrolet U-joint tool.............. google is your friend

 

Thanks, I had a couple of '50 Chevies back in the mid '60s.......never knew that you needed a tool for that, and I swapped a bunch of trannies out. They seemed to like to break under youthful abuse.