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Click on image for the lowdown. 
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| | | Forums66 Topics128,156 Posts1,056,870 Members48,456 | | Most Online14,466
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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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| | | | Joined: Nov 2000 Posts: 1,971 'Bolter | | 'Bolter Joined: Nov 2000 Posts: 1,971 | Unless it is a conversion/ speed shifter for a 3-speed the floor shift is an SM-420 4-speed HD truck trans. They also came with 2 versions of 3-speed column shift and an automatic. I don't remember now if the 2-speed Powerglide was still used in 66 or if they were all 3-sped THM 350's. Good luck with it. My 1st pickup was a 66 C10 longbed fleetside with 250-6 and 3-speed. Wish I stll had it! 
Professional Novice
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