Re: 1948 Ford pops out of 2nd gear
Easy check is to make sure the shifter linkage is adjusted properly. While you're at it look at the four bushings (2 for each rod) for looseness and wear. Make adjustments. Fix the loose bushings.
If the trans is still popping out of second gear, you'll have to get the trans out and go through it. All of the possible problems would require opening it up and tearing it down. The primary problem will be excessive endplay with either the input shaft or the output shaft, or both. This is controlled by the snap rings on the ball bearings. Too much endplay of second gear on the mainshaft. Worn synchro teeth on second gear. Worn splines inside the synchro slider. Excessive wear on the shifter lever and the second/high shift fork.
All these things are part of a comprehensive rebuild. You might choose to deal with the issue during the driving season for now, and put the job on the back burner (i.e. winter time).
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