It seems like I did "it" again and although I have run out of space a long time ago I got myself another project- A pretty solid sun burnt but unmolested 51 Chevy truck with a cracked 216ci stovebolt. I was thinking about replacing the 216 with a 235 ( which I don´t have yet) or a 283 ( which I have a couple of), keep the stock transmission ( maybe replace it with a 3 speed OD out of a 55 Chevy 210 that I also have) and maybe put more highway friendly gears in the rearend... Before I start making guessitmates I would like to learn from you guys abou the ins and outs of the AD trucks....what gear ratio a 3100 came with from the factory for example. I think maybe 4.11-5.13 would be in the ballpark, right? Did the AD trucks have an open drivetrain or the same torque tube setup as the pass cars? I have an early 60s 283 from a stick shift car ( along with flywheel/ clutch/ bellhousing /etc) , would that setup be likely to bolt up to the stock 51 3 speed box? If it turned out to be a torque tube setup I´d probably think about swapping in another rearend , replacing the closed drive trans with the 3 speed OD I have and go with the 283, unless I can find a reasonably priced 235 that does not need a ton of work. The truck wont be lowered, it will mostly remain what it is, an old solid but well worn work truck with a little highway friendlier habits. What would be your approach?