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1951 F1 with 302 (1973 I believe), C4, and 9” rear end.
I bought the truck at an auction with minimal info; was led to believe that the drive trail came out of a F-100.
Today was the day to do maintenance on the rear brakes. Started with the passenger side which was pretty dirty due to a leaking seal (already replaced by others). Checked brake shoe and instead of being 2.25” (spec for F100), it’s 1.75” (width).
Can anybody give me a lead on what this rear end came out of so I can get the correct parts? It’s definitely a 9”.
TIA!
Assuming it's an F100 rear, I believe 1968 was the first year for the 2.25" brakes. 67 and earlier had 1.75. This is just coming off the top of my fading memory, so hopefully someone else will pop in and confirm or call me an idiot.
Is there an axle id tag by any chance? Casting numbers on the pumpkin may also reveal a date code and year of manufacture.
Assuming it's an F100 rear, I believe 1968 was the first year for the 2.25" brakes. 67 and earlier had 1.75. This is just coming off the top of my fading memory, so hopefully someone else will pop in and confirm or call me an idiot.
Is there an axle id tag by any chance? Casting numbers on the pumpkin may also reveal a date code and year of manufacture.
Drivers rear during 4 link installation (by outside shop). Original gears 3.7 replaced with 3.0 WDM-K 3 70. 70A302
The C7AW engineering number identifies the 3rd member as being 67 or newer. Finding the date code on the other side as shown in the pic above will narrow it down further. It may have been changed with the gears when those were exchanged, too. It could also be a newer axle with older brakes retained. It's a lot harder to identify individual pieces after the original assembly has been opened up and changed.
The C7AW engineering number identifies the 3rd member as being 67 or newer. Finding the date code on the other side as shown in the pic above will narrow it down further. It may have been changed with the gears when those were exchanged, too. It could also be a newer axle with older brakes retained. It's a lot harder to identify individual pieces after the original assembly has been opened up and changed.
I was the one who had the gears changed, so the axles and brakes were not changed then.
One last question, after seeing some of the other “stuff” on the truck (done by the previous owner) is it possible that they put 1.75” brakes and drums on a axel/backplate set up for 2.25” shoes?
Did you put new gears on your original carrier and/or in your original pumpkin, or did you swap out the whole 3rd member?
From what I can see from my house, your shoes seem to fit the backing plate fine. If the drums fit as good, I'd say you have matching parts. I would think(?) the wider shoes would use a backing plate with a different offset and if you had that plate it would look goofy and not work right with the narrower shoes, and the narrower drum wouldn't go all the way back to it. The axle/drum mounting surface is the same no matter which brake width you have, and the brakes cannot come outward.
If that's your original pumpkin, with the narrower brakes, it's quite possible you have a 67 F100 axle assembly. It's also possible you have a mixed bag of parts from who knows what, but for the sake of this discussion, your brakes are pre 67.
Wayne mentioned fading memories - here's mine from 23 yrs ago. When I swapped my third member on my 48 for a 63 9" I was surprised to see the 48 backing plates would bolt on the 9" stubs. Thus it's possible to use the old brake set-up on a replacement axle. It would be easy to measure your drums and determine if they were made for 2.25" brakes vs. 1.75"
Thanks for that, Tim. That was my recollection, too. I don't know if it's a symptom of getting old, or what, but I find myself questioning things like that that I know I know, but just not sure anymore.
My 9" had 1.75 brakes and backing plates and I upgraded to 2.5" brakes and backing plates, as mentioned they all interchange. As long as you get the correct shoes for your back plates, which look to be 1.75" as you mentioned, you will be good to go.
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