Found! AB Linn is out as are the folks at MidWest Military, but Paul at Surplus City came through!

Took the engine to the engine rebuilder the other day. It is a rather busy shop, funny how the tone of the conversation changes when you show up with a lump in the bed of your truck to be dropped off. Got to speak with the guys with the dirty hands. Turns out they have built loads of the flat head s...

Any chance of finding a decent replacement 1st/2nd gear for a NP420? If so where please. Removed the NP420 from my 46 years static M37. But before that I drained the oil. To my surprise it came out looking fantastic...then we got to the bottom where the stream turned to light brown syrupy ick. So ou...

Here is picture of the oil fill tube flange. Upon closer look it appears to be a press-fit adaptation.
So a Plymouth block... perhaps I can add a Mopar high flow oil pump to the rebuild list.

Thanks RMS. I will add vales and vale seats to the list. If the pistons are is spec OK to keep or shall I look for a more recent, better metallurgy, alternative.

Thanks for the details Elwood - exactly what I was in search of. This engine indeed has the 2-bolt fanged oil fill pipe and 8-bolt flywheel. By-the-by, the clutch is not even fully burnished and the surfaces on both the flywheel and pressure plate a mirror smooth, really quite beautiful. However, th...

Hi All New M37 owner. Going to have the engine in my M37 rebuilt. I would like to have it rebuilt so that it provides optimal performance for the T245 type of motor. I do not want to hot rod it but getting it rebuild so that I can drive 55mph for a hour or two duration is desired. So if cam, dual ca...