Yeah, the backlash has been getting noticeably worse, albeit slowly, for some time now.
I did a bit more poking around - this might be the push to upgrade to a W56. Doesn't look like MC makes the L52HD anymore, and I don't know if it's worth it to rebuild with stock bearings as I have every intention of continuing to beat this truck like a rented mule. I need to pontificate on it.
I'm also kind of obsessed with the idea of putting an NV4500 in the truck, it has a monster low first gear and a better overdrive in 5th. I discovered Advance Adapters' kit to mate it to an RF1A just about the same time as they discontinued it. The other cool unicorn option (also discontinued) is the Advance Adapters Ranger Box. Would be super cool to put that in front of a granny gear 4 speed and have yet another shifter to brag about.
If anyone reading this has the NV4500 kit or a Ranger Box and wants to part with it... hook a brother up