Well, you can use an SM420 or SM465 wide ratio truck transmission if you want to haul stuff, or a standard GM Muncie or Saginaw will bolt up. You can also use an 89MM with a GM bolt pattern if you can find one in good shape, they are a 4 speed overdrive. I have an SM420 in my pickup at the moment. I am working on upgrading the rearend to 3.08 gears for psuedo overdrive.
You can also install a T5 with a bit of work and a differant clutch.
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1950 Chevy pickup with '62 261, 4 speed.
