Yes, truck 235s from 1954 onwards were higher-pressure systems, with pressurized oil being delivered to the rods through the crank-shaft (no longer using/needing dippers on the rods). Call it full-pressure, if you like, but Chevrolet often also used the term "full-pressure" to describe the features of the earlier lower-pressure oil system that had dippers on the rods.
Chevrolet did not use the term "splash lubrication" to describe the "dipper" lubrication system. The dipper system obtained oil at low RPM by dipping into the oil and obtained continuous lubrication at higher RPMs by spraying a (pressurized) stream of oil into the dippers (Chevrolet actually called it a "high-pressure" stream of oil (good for marketing, I guess).
