I need to do an inspection and possibly order drive-train parts.
After some time, I am not always sure what I have is stock so I am doing some due diligence and researching.

The Trans is a 4 speed marked as follows...

T 8 D-1A
8-1 21c 7049 B2
59T-7006
N .4.

The rear is as follows...

41
0141
16429 (or 8)

Tag;
W
51 over 13
10 Bolts looks and like a "Spicer" on page 144 of the 1948-1956 Parts and Accessories catalog.

Again, this is supposed to be a 1950 F1, possibly a late year '50 but I can't read the stampings on the firewall.

Thanks for the help.

Dan Sokol
Goodyear, AZ

 

Looks like the normal Non-synchro'd 4 speed trans used in trucks from F1 up.

The 41 indicates the rear is the earlier Spicer 41 and not a newer Dana 44 so parts are harder to come by.

The tag 51/13 figures to 3.92 which is again the early ratio found in 48-50 trucks. 51/52 went to 3.73 iirc

 

Actually it was the other way around. The 48-50's primarily had 3.73's. Ford went with the 3.92's in the 51-52's. It's interesting that the OP has a Dana 41 with a supposed 3.92. I THINK it was an option.

 

You are correct, sir! The 51-52 D44 with standard 3.92 ratio used 47/12 gears (3.9166) vs. the 51/13 (3.9230).

A D41 with the 3.92 was optional on '48 -'50's.

 

Excellent!

So a good old 4 speed crash box with a 1941 Dana/Spicer, 3.92 Rear.


Thank you very much!

Dan Sokol

 

What do I know?? My 48 came with the venerable 4.27

I could've sworn it was Ross who convinced me they did 3.73s.... oh, well

Dan, it's not a 1941, just a model 41

 

Not sure what you mean, MT? 3.73 was standard on 48-50's, 4.27 was a common option, 3.92 was (from what I've seen) a relatively rare option. Starting in '51, 3.92 was standard, no option for a 3.73, 4.27 still an option.

On a side note, I've never figured out what that Star next to the 0M-4209 p/n means, but in this case from past threads I believe it means it is a Service Part for 48-50, but only came from the factory in '50.

 

I mean I'm still learning - lol. ..and I'm old enuf that I'm learning things I used to know all over again.

 

An interesting side note:

The parts manual doesn't list a gear set for the 4.27:1 for an F1:


And yet the operators manual from July 19 1949 shows it as available:


And there is no mention of a 3.92:1 in either document. Ross, where did you get the document clipping in this post?

 

It's at the end of the list you just posted, for some reason, p. 195 of the parts manual.

 

Pete, you're making the common mistake of confusing the service parts catalog with a production build bible. The parts catalog (it's not a manual) only lists the replacement parts currently available that will apply to any given model of vehicle, at the time of its printing. The catalog is constantly changed and updates are reprinted regularly. By the time your book was published, many hundreds of parts may have been discontinued or otherwise superceded with a different part/number, etc., and no longer offered as replacement, service parts. If a part, like the gear set in question, isn't something they sold a lot of, it would've been discontinued quickly.

 

Ah . . . yes, I see it on the bottom of the next page. As Wayne suggests they must have added it in an update and that was the only place to do it without re-typesetting the whole page. More than likely they suddenly discovered what the plants were doing after dealers started asking for unknown parts.

So it looks like a 1950 F1 could come with 3.73, 3.92 or 4.27:1 ratios.

You are right Wayne. Certainly the "Operators Manuals", even today, are printed at the first of the year and are never update. They always miss things.

 

I just found this interesting thread. My 51 F1 has a floorshift and I think its the original gearbox (haven't looked at the numbers) but the diff numbers are a letter A (in a circle), 44, and 18419.....plus the U.S pat nos. There is also the number 427 stamped on the axle tube. What kind of gearing can I expect from this setup......decent cruising or stump pulling?
Thanks for your help and advice.

 

If it is a 4 speed gearbox with "granny low" it is definitely a stump puller.

 

A 1951 F-1 would have had a column shift transmission. I suspect your truck had a swap somewhere along the line.