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Well, two reboots and I still can't post attachments.....

50wt engine oil is indeed the correct lubricant for a spicer transmission of this vintage/ design. See the attached scan from my 50s Reo maintenance manual. The local truck shop has it on the shelf.

Pretty miserable customer service all around. How hard can it be for them to look it up?

I would speculate that it was a compromise to make logistics simpler.

The correct lubricant for the spicer transmissions is 50wt engine oil.

One other interesting point is that the LDS piston cooling channel only decreases piston top ring temperature by 100°F (only 50% of the squirted oil makes it into the channel). "Oil is circulated through this annulus to reduce the temperature of the ring groove and thereby eliminate the...

Easiest way is to go to SAE website store and search "papers" or "transactions" for "multifuel". There is quite a bit out there. I wasn't able to get a photocopy through interlibrary loan for ANY of the "papers". The transactions should be in a library near you and available through...

I can't upload it. The pdf document can only be viewed on my computer and I have already printed my first of two allowed copies (digital rights management). There isn't really THAT much new and the document is only nine pages. It specifically states that the following features contribute to...

I downloaded a paper from the SAE "Development of Multifuel Features of the LD-465 and LDS-465 Military Engines". It describes the evolution of the LDS-427 into the later LD(s)-465-1,2. One of the more interesting statements was this: "Work has continued for further performance increases, in...

All you need to do to get more torque is to downshift. What you are really asking for is more horsepower. How about ONE good engine? ie cummins 5.9 or DT466

I believe that the links above will describe how to convert the FS to FSO using off the shelf parts. The first gen NV5600 had a smaller input shaft. My understanding was that the G56 had the lube issues?

Conversion Parts List

NV5600 to FSO6406A 6 speed Fuller - Page 2 - Dodge Cummins Diesel Forum

I have had no problems with the NV5600 in my dodge, but like the others have posted, it will be expensive to fix. I'd try for something more common and less $$$$$ How about a 6 speed Fuller FSO-6406A transmission?

Can you provide an overview of the best noise reducing mods?

Not that I am working for a university, I have access to a good library. I have been reading up on diesel engine design and technology. The books don't really talk much about multifuel capability (besides the need for higher compression). They do compare combustion pressure versus crank angle...

Additionally, some had drilled throws, some didn't. Seems like a lot of variation for a "contract" engine. Perhaps, it does point to some manufacturers being better than others. It'd be nice to be able to identify this from the year/ model tag on the engine.

I had occasion to see a number of LDT multifuel crankshafts out of the block. The number of counterweights and overall design varied. Anybody have any details of why or when these changes were made?

I have a civilian Reo manual from the fifties and it states that Spicer transmissions should use "SAE #50 engine oil". It also states "no additives designed to impart extreme pressure properties should be used." I asked the local truck shop and they pointed me to the 50wt sitting on their shelf.

Gear oil will work but it is not correct. The proper oil for a spicer tranny is 50wt engine oil. You can get it at your local truck shop.