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49 F-1 differential ID

 
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Old 11-01-2011, 07:20 PM
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49 F-1 differential ID

Hey guys, I need info from ya, mostly just for curiosity sake..... I'm working on the old 49 F-1 and I finally got to work on the rear differential, removing years of grime and crap off it. I looked at some older post trying to figure out what rear end this is and I came to the conclusion (I think) that its a Dana 41. In the upper left hand of the center of the axle it reads 16429, upper right is a US patent, lower left is a US patent and lower right is stamped 41. It also has a tag bolted to it that reads W 41/11. On the right axle it looks like a stamp that reads 6649A, but is more or less fades toward the "A" and is hard to read so I may be wrong on that one. Ideas???

Thanks!! Will
 
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Old 11-01-2011, 08:00 PM
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Indeed a dana 41. And with the rather rare 3.73 gear ratio to boot. On the passenger side axle tube, you might be able to find a date code stamped on it.
 
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Old 11-01-2011, 08:17 PM
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Thats where I got that "6649A" number but it was hard the read so I wasn't sure if that was a 9 or an A.
 
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Old 11-01-2011, 08:38 PM
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A could be an R? June 6th, 1949.

I wonder if after the date stamped, if there's a simple sequential build number/letter.
Here's my spare dana 44:
 
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Old 11-01-2011, 08:48 PM
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OK, I just went out for another look. This time with my reader glasses AND a magnifying glass. It is definately an A. What did the letters at the end signify?
 
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Old 11-01-2011, 09:31 PM
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Originally Posted by havi View Post
Indeed a dana 41. And with the rather rare 3.73 gear ratio to boot. On the passenger side axle tube, you might be able to find a date code stamped on it.
I believe 3.73 was the standard ratio with a V8 up til '50? At which point they geared down to 3.92 as standard. That's why manure spreaders race away from the monkey faces at stoplights!
 
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Old 11-01-2011, 09:40 PM
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But we get you on the top end! I've got FOUR Dana 41's. All of them have the 3.73. Only 2 are attached to trucks. You want one!?
 
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Old 11-01-2011, 10:01 PM
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Originally Posted by ALBUQ F-1 View Post
I believe 3.73 was the standard ratio with a V8 up til '50? At which point they geared down to 3.92 as standard. That's why manure spreaders race away from the monkey faces at stoplights! I see the manure spreader is sportin' Dubs! totally DONK!
The shop manual (the reprint w/52 supplement) only lists 3.92 and 4.27 gears, that's what I was going off of, but I remember someone talking about 3.73's being an option? Each of my F1's had crashbox 4's, 1 6 cyl, 1 v8, and they each had 4.27's. I'd be pretty happy 3.73's, though.
 
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Old 11-01-2011, 10:10 PM
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Havi, a few years ago, some guys (I'm pretty sure it was actually Ross) pointed out that there is a misprint in the shop manual. Apparently there's another spot in the manual that correctly lists the 3.73's.
 
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Old 11-01-2011, 10:31 PM
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Originally Posted by ALBUQ F-1 View Post
I believe 3.73 was the standard ratio with a V8 up til '50? At which point they geared down to 3.92 as standard. That's why manure spreaders race away from the monkey faces at stoplights!
My 48 F1 had 4.27 gears. 0-45 was really fast but then it just stayed there.

That's why I swapped in the 3.50 9". I'll give you light-to-light in exchange for hwy speeds.
 
 
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