Started to finally clean up my trans and found these markings under the 51 year old fossilized grease. Would these be original?
Not sure why the pic rotated

 

They definitely stenciled things on in that color of yellow, but these are known markings here. See my post #14 at the link below for an example of the stenciled information and what it means. The Master Parts Catalog can help decipher other codes just like these. It might take some research to figure out if that marking on yours has a particular meaning that can be determined.

You can see the F350 has an F27 where yours has the F19 - kept cleaning yours toward the front and you should find the codes that I know how to look up. I can almost guarantee you they are there from looking at your picture closely. I can see a hint of yellow where they should be. Yours is certainly original markings I would assume.

https://www.ford-trucks.com/forums/1...l#post16775546



Chad

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One thought is it might be a hand painted date code of assembly.

F27 might be June 27, 1966 - This F350 was assembled in July 1966.

I don't know if I have your warranty plate info - but is your truck a later June or July assembly date? could it be

June 19, 1966 by any chance?

Chad

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I see yours if more like a November 1965 date - so scratch that thought....lol

Chad

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Thanks Chad - Well.....I was looking at mine as "FM". Thanks for pointing out that's a "19" lol. I need stronger readers. I'll keep at it to see what else is I uncover and yes, according to a previous decoding by ND, my truck was November 65.

BTW - Any easy way to remove the 50 years of caked on grim? I'm using a degreaser, putty knife and good old elbow grease but its a PIA. 2800 PSI Pressure washer couldn't even blast it off.

 

Think of it like an archaeological dig. Take your time and you will have it done before you know it. It's fun to preserve any of these original markings, I think.

I expect you will find the same characters as mine - the 5N4AT, since that applied to all NP435 in the 1966 model year F100/250 (6 & 8 cyl.) - 4/W/D

Possibly a 6N3G

There are tons of codes, but this is a snippet that includes your and my trucks.



Chad

 

Oh, and you are seeing the - what look like screw heads - that are cast into the side there in your and my pics, too. See what that indicates as you get there.

Mine says

4X28

I can tell your transmission is different than mine as I look closer. The same bosses and bolts to hold my transfer case shift lever bracket is not evident on yours. Something different about the Dana 21 versus Dana 24, I suspect - and how the shift lever for it mounts - so yours is probably not a 5N4AT, but we shall see what she says hopefully.

If yours has a 4X19 between the two cast screw heads - that might lead to a thought.

Chad

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Hey Chad, Here is what I discovered today. Actually 2 things, (1)degreaser is fine, (2)I tried a little spot of easy off and i almost erased history!! I have more cleaning to to but here are the uncovered markings. I also added the Transfer case tag. The number in the casting isn't that clear in the picture between the 2 screw heads but I can see by eye it is clearly 10-12

 

Transmission shop markings. The dead bang give-away is the trans is painted red, yellow paint used to ID it.

Transmission rebuilders usually painted trannies either red or green.

FM may refer to Ford Motor Co., or to Ford-O-Matic. Since you have a 1966, the trans cannot be a Ford-O-Matic.

 

The trans is a NP435. 4 speed with granny 1 and R. I too, thought it was "FM" originally but when Chad pointed out that it is actually "F19" it was clear that it was indeed "F19". What color where factory trannies?

 

Ford didn't paint transmissions or bell housings, because they couldn't be seen on new vehicles when the hoods were raised on dealers lots, showrooms and at auto shows.

 

If you can find access to a steam cleaner type pressure washer somewhere, that will clean things off right quick.

 

New Process dipped their fresh transmission and transfer cases in an ELPO tank to stave off rust giving it a red oxide appearance both inside and outside. If that were paint it would not survive your scraping at it and pressure washing it at 2800 PSI.

If you have ever rebuilt an NP435 or an NP205 or any other New Process stuff you will see it inside the cases, too. Not something a rebuilder has done.

The yellow markings are factory markings, too. I told you it would be either 5N4AT or 6N3G before you scraped on that part. The F19 is also factory markings similar to the F27 on the other truck you have seen pictures of.

Chad

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If you think that marked FM or F19 in yellow paint is factory, you're wrong, because it ain't.

Looks like a kid wearing glasses thicker than NYY pitcher Ryan Duran went hog wild with yellow poster paint.

FoMoCo would have used yellow spray paint w/a stencil.

 

If that were done in simple paint many moons after it left the factory it would come off very easily because it would be on top of some grime. I have seen too many with these markings to know they are original. If you compare the color of the paint it is the same yellow. Just a little thicker in places.

Rebuilders would soak the hell out of a case and remove the original stencil markings, too.

Did you happen to look at the pics of the F350 - same as some others - I just have never figured out what it means. But always F and then 2 digits.

Look how they did the ROT numbers on the firewall and other places - simple crayon in that case.

Chad

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