8.75 Sure Grip axle end play - left side

Honestly, I don't know how to tell the difference between clutch or cone. How does it matter? The thrust buttons are the same anyway, aren't they?

Do thrust buttons come in different sizes?
Does the year of the carrier I got then make a difference? (I'm not sure what year it is)

The roll pin between the buttons can go ALL THE WAY through each of them, so they don't really set a distance between the axles; they just butt up against the carrier and take up that amount of space. Therefore, the right axle adjustment has no effect on the left axle adjustment. Could I have a wrong set of thrust buttons?

Hmmm.

Because you have installed the 2 buttons and associated pin,, which type you have is obvious..

Those buttons/block don't butt the carrier,, there is space for them to float betwen the 2 axles,, so tightening up one axle, transmits thru the buttons/block to push the other axle against it bearings..

But.. if you didn't install the pin properly and peen the end over to capture the 2 buttons,, often 1 button will fall out,, and cause a "no adjustment" situation,, check both buttons are there..

hope it helps..