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Whoa, that looks like a great start.
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That is not too rough. Better than 95% of the M715s out there! I don’t know about the transfer case verification but it looks original and so does the T98. So I would say it has to be a NP200.
Very nice start. It appears that you have the original transmission and transfer case so that is a good start. Also, Chevrolet inline 6-cylinder engines are usually pretty reliable. Blue smoke is usually engine oil. It could be valve seals or rings. but for starters, oil is not all that expensive for now.
NP 200 case in the stock OD.
Is that six the one they called the Babbitt Beater?
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Babbitt is the metal bearing shells are made of, and I think the engine I was referring to was the one used in CCKW & 7107 army trucks, and probably many other vehicles of that time period.
Great truck.
The 250 is a fantastic engine. If I remember right the rear main seal is a 2 piece you can replace without removing the crankshaft from the engine. And the valve cover is prone to leakage after they've been worked on... By that I mean they get bent out of shape easy when they're pulled and won't seal correctly after that. Usually if somebody used a wire wheel to clean the mating surface, that'll deform the metal just enough that it'll leak.
All tins are like that but the old Chevys seemed to be a little thinner metal to me. You might be able to find a new one if that's the case with yours.
And if it's like every other truck on here it'll need new wheel cylinders and rubber lines for sure. and if it's the original master cylinder, the old seal on it will start leaking when you start driving it regularly.
The E350 wheel cylinder conversion and a dual reservoir master cylinder conversion are pretty cheap and easy.
Beautiful plumbing job on your air lines!