Commodore

It looks like to me that these tanks were never used by a OEM, just aftermarket. See link a description of operation. http://books.google.com/books?id=HFLmAAAAMAAJ&pg=PA500&lpg=PA500&dq=Byrne-Kingston++tank&source=bl&ots=VgIgvkgIWO&sig=NzuqhzlKmFC6IC6Sqa_oLYUTkBY&hl=en&sa=X&ei=8rNNVKfaHozwoASW3IHgAQ&ved=0CCMQ6AEwAQ#v=onepage&q=Byrne-Kingston%20%20tank&f=false

OK, I think I have solved this one. There is a stealth path to ground created by battery acid, dirt and moisture connecting the negative terminal to the battery hold down and/or the battery tray. This path will not conduct much current but it doesn't need to has the voltmeter draws very little.

First, is you car positive or negative ground?

Well, if the 1938 Oldsmobile transmission doesn't workout, try looking for a 1937 - 1939 Chevrolet 1/2 to 1 ton truck transmission. This fits 1937 - 1938 GMC trucks with the Oldsmobile engine.

It sure looks like 1/2 ton truck. It doesn't have a full floating axle. The 1 1/2 ton GMC trucks did. A 1/2 ton GMC truck. A 1 1/2 ton GMC truck

According to my interchange manual Oldsmobile Six's 1937 - 1948 will interchange. The transmission is other story. Early 1938 Oldsmobile's (to engine number F836892) used the 1937 transmission. The later 1938 transmission will bolt up to the 1937 engine but the universal housing is different. This for passenger cars. Some GMC trucks used the Oldsmobile Six, but used a different transmission. I think your truck maybe a re-badged GMC. If so it may use a torque tube set up. Does your truck use torque tube? The passenger cars used an open drive shaft.

1950Dodge is correct. The Six was only offered with the 3-speed and only in the Bel Air sedan not the coupe. If you wanted an automatic you had to go with the 350 V8. See this Vehicle Information Kit from the GM Heritage Center. Look on page 43. http://www.gmheritagecenter.com/docs/gm-heritage-archive/vehicle-information-kits/Chevrolet/1973-Chevrolet.pdf

Well, the State Library of Western Australia has a copy. Maybe you can get them to make a copy for you as one Aussie to another. See link. http://www.worldcat.org/title/oldsmobile-truck-manual-1937-truck-chassis-models-c112-c126-c131-c157-f130-f155h-f155l/oclc/757765047

You might contact the Veteran Motor Car Club of America for information on the 1951 Greenfield Village meet. See link. http://www.vmcca.org/

It looks like it is a 1956 Hudson because it is gold colored. 1957's were chrome.

Yes. Nash did build a LeMans Dual Jetfire with a single carb. See photo. This engine came out of a 1952 Nash Healey. But may not be stock. My feeling is that the single carb LeMans Dual Jetfire was offered in the 1955-56 time frame, but I could be wrong.

That book you have has few errors in the Nash section. See brochures. 1955 1956

The Le Mans duel jet fire motor was offered from 1953 to 1956. In 1957 only the V8 was offered. I don't have any productions numbers except that 40,133 Statesman/ Ambassadors were build in the 1955 model year.

The car in question is a 1955 Nash. The parking lights are the ID point. See photo. Here is a photo of a 1956 Nash.

I got the information on this carburetor from this ad. See link. http://books.google.com/books?id=yPEyAQAAMAAJ&pg=PA185&lpg=PA185&dq=Zenith+HF4B+carburetor&source=bl&ots=kTjaE3lWfb&sig=6Tso5WTM7rOk0fNba58a6r09hO0&hl=en&sa=X&ei=TwsZU-r0BILkoATns4CwDw&ved=0CEAQ6AEwBA#v=onepage&q=Zenith%20HF4B%20carburetor&f=false