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Click on image for the lowdown. 
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| | | Forums66 Topics128,022 Posts1,055,360 Members48,420 | | 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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| | | | Joined: Jan 2011 Posts: 32 New Guy | | New Guy Joined: Jan 2011 Posts: 32 | Should have an SM420 in it if stock. This is a 4 speed, very low 1st gear trans. Look at the passenger side of the trans, it should have a PTO or PTO plate in about the middle of the trans. If it has a PTO on the driver's side down low, you may have an SM465, another well built trans.
1949 1.5 Ton 4400, 1969 c10, 1989 c1500, 1990 K2500, 2010 C1500 Crew
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