Quote:
Originally Posted by JRTJH
I think first you'd need to determine the shank (threaded part) length and width, then limit your search for balls that have that size shank. Curt has 2 5/16" balls with shoulders in different heights. More important that the height of the shoulder is the ball weight rating. You can find 2 5/16" balls rated with different weights. Some are only rated to carry 6,000 lbs while some are rated to carry 20,000 lbs, so make sure, if you decide to replace the ball, to get one with the proper size shank and the proper (adequate) weight rating, regardless of how tall the shoulder might be.
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The drop in ball is not threaded. Those are the bumper pull hitch type as far as I can tell. Drop in have a release mechanism within for quick mounting. I have no actual experience using one, but going by the pics and videos online I've never seen a threaded shank installed in the bed of the truck.
The weight ratings do vary I've noticed. Not sure why that is though.