These trucks dont need that much slip, remember the axle flexs left and right, the Pinion really never goes full drop unless you are catching air. I have seen plenty of trucks (well built) go up on a lift and drop a shaft. Its like you said, youve been using it, it never seporated before. If want a super cheap fix, throw a limit strap in the center of the axle, you will still get all the flex you have now, and some piece of mind.
my
let the flaming begin
![Flamer :flamer:](https://board.marlincrawler.com/Smileys/marlin/flamer.gif)
I'd go with this...............
(no flame)