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Oh Lord, I just gotta find it....
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Jan 21st, 2020
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Joined: Jun 2012
Posts: 38
OP
Wrench Fetcher
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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.
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Joined: Feb 2002
Posts: 12,860
Extreme Gabster
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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
Bill
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