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There is no dip stick.
To check tranny fluid level, there is a square head threaded plug on the passenger side of the tranny housing.
The fluid when cold should be a half inch below the threaded plug hole.
Fluid when hot should be level with threaded plug hole.
Use pinky finger on your hand to check level.
Use threaded hole to fill or top off fluid.
GM film strip Picture of square head plugs Slide 14

Type of fluid to use is 90 weight gear lube.

To drain fluid there is a square head threaded plug on bottom back of the tranny housing.

Capacity of 4 speed tranny is 6 pints 1952 OPERATOR'S MANUAL
If fluid seems to disappear, the torque tube oil seal may be worn and leaking tranny fluid down the torque tube into rear axle housing.

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