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The only major difference on the later post war truck transmissions through 1950 and the 1939 transmission is the rear housing and the main output shaft. The rest of the parts are same as the 1939 passenger or commercial car transmission. The main shafts and rear bearing housings were used for some time prior to 1939 so those parts are out there. If the 1934 transmission still has the original angle back shift tower then it would have to be modified to work with the straight up shift tower and the 91A shift fork to work with the later gears installed. I've heard of folks successfully modifying an old style shift tower to work but I've not seen what was done to get it that way. If the later transmission is installed or the tower is changed, the shifter will be in a different location so the floor plate has to be modified for that.