Check your gear box & rear end! Seems the brake fluid & gearboxes always get overlooked. The oil in my '56 looked like someone added about 3lbs of chocolate to the box & called it good. More sludge than liquid, thankfully still had lubricating qualities tho.
I still need to drain & service the ram on my beast as well since it only goes about halfway up and leaks alot, leaving that for later tho. Same thing as yours, no resivior, just a fitting on the top of the ram.

1956 GMC 370 dump " 'Tater "
1970 VW Volksrod "the Black Bomber"
2007 Chevy Avalanche
2020 Jeep Cherokee Trailhawk,
2005 Harley Davidson FLHTCUI

I dig all cars, old and new, whether they were hammered out of American iron, German steel, or Japanese tin cans. Being unable to appreciate them all is missing out on a world of great things.
But thats just MY opinion! :P