The discussion of a vaccum motor versus electrical motor is something the owner has to decide for themselves.
Below is some information about the vacuum motor that may help you to make a decision.
The Trico model number will be printed on the small cover. Trico SSM-412-2 was used 1947 (second half year) to 1953 (See attached photo 01).
A good comment from Denny concerning vacuum requirements (page 1):
https://www.stovebolt.com/ubbthreads/ubbthreads.php/topics/647167/1.htmlConsider that as the 216 or 235 I6 engine wears from use (basically piston rings), it produces less available vacuum for the wiper motor operation.
The long term optimum solution may be to use a vacumm motor rebuild service as discussed.
Here is a link to a discussion and pictures of the parts under the small cover (it may be similar to yours):
https://forums.aaca.org/topic/302219-trico-vacuum-wiper-motor-parts/Even with original new cars and trucks, the vacuum wiper system was "lacking" when the engine is under load.
There were two original options for providing more or consistant vacuum.
The costly Trico ElectroVac (attached photo 02) and the AC (GM) dual action (fuel and vacuum) pump (attached photo 03).
A caution about lubrication of the vacuum wiper motor. Consider that the lubrication used can also be sucked back into the intake manifold and into the engine.
Additional information:
Although not original, you can purchase updated (1947-53) wiper arms that uses the 1954 style clip-on 10" wiper blade.
This style of wiper blade is a GM improvement.
