2241891 is a GMC part number for a 1948 and older GMC. It will fit in place of a sliding gear 4 speed or a stick shift 3 speed which made it a desirable transmission 70 years ago to make old pickups go faster. It worked in both Chev and GMC. Between 1947 and 1948 GMC changed the bolt pattern to the clutch housing when they came out with the SM420. The older clutch housing also has different mounting than the later one. All 228-302 series GMC engines have the same bolt pattern to the clutch housing. It would bolt right into the 1941 and 1946 models shown but not the late 1948, the 1950 nor the 1954.

https://photos.app.goo.gl/6bLA6f1WbA3uswQS9