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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: May 2015 Posts: 11,150 Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums | | Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums Joined: May 2015 Posts: 11,150 | The SM420 isn't going to get you going any faster than your current tranny. The 4th gear in it is a granny or stump puller LOW gear. It's the type of tranny that's generally used as a 3-speed unless you need a lower gear to start a big load moving. Both it and your 46 3-speed have a 1:1 high gear ratio.
You are probably wanting an overdrive tranny - T5 or similar. Those will require you to go to an open driveline to the rear axle.
Kevin 1951 Chevy 3100 work truckFollow this saga in Project JournalPhotos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together. | | |
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