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Is this casting number a Saginaw 4 speed? The side of tranny casting number is GM 3781980. It has a granny gear and wondering if there's a swap to eliminate granny and get better gearing for in town and highway use. It appears to be the original transmission. Thanks.
you have the standard SM420 4 speed, usually folks just ignore 1st and use it as a 3 speed .... your choice is go with the original standard 3 speed, no granny, but still 1:1 high, or find an original style OD 3 speed, or switch to a modern OD trans .... or change the rear gears to the [sometimes] available 3.38 ratio
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics