I am starting to restore a 1951 F1 and was going to use the original axle.
But now I think the axle is something different and not sure what it is.
The VIN plate shows axle ratio of 3:92.
The tag on the rear cover is as follows: W 43 over 13 shown as a fraction. Flange to flange measures 56 1/2 inches. Top to bottom (Outside)of pumpkin measure 9". 5 hole bolt pattern for 16" rims.
I'm not sure what I have. If any one has other things to check to help identify this I would be most appreciative.
Roger

 

Any possibility you could post a picture?

Here's a link to a great site that discusses 9" rear ends and different variations:

Kevinstang's Ford Nine Inch Differential Page +

Here's one of an original 51 rear end:

 

See if there are numbers stamped on the axle tubes just inboard of the brakes on either side.

 

I THINK that is a 3.30 rear end. Just doing the math on your tag. But somebody else can confirm or tell me I'm crazy. I just measured an original F1 rear end just the other day and was 61 inches from outside hub to outside hub (place a couple of yard sticks, etc. on the flat outside surface of the hubs at the base of the studs and measure the distance between them).

 

I'm assuming he measured to the axle housing flanges (inside the brake backing plates), not the ends of the actual axles? That would be very narrow if to the outsides. 56.5" is very close to the accepted width of a stock axle (57"); as you measured it Doc, usually the number is 61.25". Neither measurement is particularly easy to make accurately.

I did the same math, problem is I can't think of any trucks that had that low of a ratio, and even most cars wouldn't have been that low until the late '50's when really big V8s came along. Cars wouldn't seem to have the same bolt pattern, tho.

 

Very good point. I would give a lot of money to my trucks if they could just talk and tell me their story. Hey I'm pretty impressed with my measurement. Especially since I had my seven year old holding one of those yard sticks (she told me that I'd screw it up, LOL).

 

I think it is a 74 Maverick 8" 3:30 ratio. Flange to flange is 56.5"
Thanks to all that responded
Roger

 

i came out with 330 too prob a swaped in 9in or something else

 

What makes you think that? 8" rears don't have rear covers.

 

I wasn't aware that 8" don't have a rear cover. WoW?
Back to more research. I'll take a picture and post.
Thanks

 

That may be what it is. The 8" is alot like the 9". Front of differential unbolts to remove the ring/pinion unit. Not a rear cover like in Julie's pics.

To make sure it's an 8, look at the bottom two bolts below the pinion. If you can get to them with a socket it's an 8. If you have to use an open wrench to get to them, it's a 9". The larger bearing housing of the 9 prevents a straight approach to removing those two nuts.

edit: Wayne beat me.....evening fellows!

 

I'll get some pic's. This has a back cover, now I don't have a clue what it is.

 

It could be a Dodge axle, some of them had the same bolt pattern

 

OK, I am going to take some pic's today and will post them.
The tag with the W on it still has me wondering?
Thanks for your input.
Roger

 

I give up---how do I post pictures?