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Disc brakes F100 With 3/4 ton axels??

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Old 01-23-2018, 11:23 AM
chucks65
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Disc brakes F100 With 3/4 ton axels??

Hello all. New to working on autos but you gotta start somewhere. Found my birth year 65 F100 made in the local San Jose plant. I want to put some disc breaks on but one of the previous owners put 3/4 ton axels on it. Any thoughts or advice on fitting disc breaks on a 3/4 axel on a 1/2 ton frame? Dog Tax included.
 
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Old 01-23-2018, 11:48 AM
TheMonson
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Do you know what axles they are? What vintage?
 
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Old 01-23-2018, 12:03 PM
chucks65
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No I don't but willing to get dirty. Is there a part number or identifying feature I should look for?
 
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Old 01-23-2018, 12:06 PM
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Originally Posted by chucks65 View Post
Hello all. New to working on autos but you gotta start somewhere. Found my birth year 65 F100 made in the local San Jose plant. I want to put some disc breaks on but one of the previous owners put 3/4 ton axels on it. Any thoughts or advice on fitting disc breaks on a 3/4 axel on a 1/2 ton frame? Dog Tax included.
F100's have 5 lug wheels on a 5.50" bolt circle, F250's have 8 lug wheels on a 6.50" bolt circle.

Is your F100 2WD or 4WD? If 2WD, both it and the F250 2WD (both beginning in 1965) have independent Twin-I-Beam coil spring front suspension.

If 4WD .. both 1965 F100 & F250 4WD's have leaf spring front suspension.

What rear axle a previous owner installed could be anything, pictures of the backside of the housing will be helpful.
 
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Old 01-23-2018, 12:17 PM
TheMonson
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Originally Posted by chucks65 View Post
No I don't but willing to get dirty. Is there a part number or identifying feature I should look for?
In addition to what ND said I think there is supposed to be a tag attached to one of the differential cover bolts that will hopefully provide the necessary details. If not it may be that someone can identify it with some photos.
 
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Old 01-23-2018, 01:51 PM
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Originally Posted by TheMonson View Post
In addition to what ND said I think there is supposed to be a tag attached to one of the differential cover bolts that will hopefully provide the necessary details. If not it may be that someone can identify it with some photos.
Usually, the ID tag is missing by now. That's why I asked the OP for a pic of the backside of the housing, to see if the ID tag is still in place.
 
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Old 01-23-2018, 03:24 PM
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Old 01-23-2018, 03:26 PM
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Sorry. Thought I had the pictures posted in the original post.
 
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Old 01-23-2018, 03:33 PM
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There's so much grease on that axle, I cannot see if the tag is present or not.

Scroll down in the parts catalog pic and at the bottom it shows the Dana rear axle tag and its location.

 
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Old 01-23-2018, 06:57 PM
john jamieson
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Need pics of the front axle too. Is it possible that something got mixed up on the title and it is really an F250?
 
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Old 01-23-2018, 10:38 PM
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Swapping to front discs: Same recipe as for an F100, with the exception being the parts donor ingredients will be from an F250

f100discs

Installing Disc Brakes on Your 2WD Pickup - Pt. 1 - FORDification.com

How to Install Power Steering in a 2WD F100/250/350 - FORDification.com
 
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Old 01-24-2018, 03:19 PM
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Just for you numberdummy. I got out the de-greaser and pressure washer and there was something under all that grease. Looks like the rear axle is a Dana 60. Looking at some of the older threads could this have been a heavy duty package? The door plate listed an 07 rear Axle
 
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Old 01-24-2018, 03:33 PM
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The 07 on the warranty plate - assuming it is original to the truck - indicates how it was originally built - it would have been a Ford 9" 3.25:1 ratio non-limited slip.

Somebody swapped to the heavier duty stuff at some point in the past 50 years. Better to carry a camper with, at least.

The light axles in the F100 really limited the size of Camper they could carry - they were more of a Canopy Special.

Chad

.
 
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Old 01-24-2018, 04:23 PM
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Does the VIN on the door match the VIN stamped into the right front frame rail? If so, someone swapped that stuff in there. If not, possible frame swap with an F250 perhaps?
 
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Old 01-25-2018, 04:31 AM
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From the standpoint of putting disc brakes on the rear, I don't think it helps much identifying what rear axle you have. Since you'd have to cut and weld spindles to swap discs on a rear axle you'll likely end up swapping the whole axle for one that already has discs on it. You'll likely have to weld on spring perches if you go that route. That being said, rear disc brakes are a marginal (if any) upgrade for the rear. There's benefit for the front (more even/steady, more efficient, better heat resistance) but not the rear.

To redo the rear drum brakes, it's nice to identify the rear axle so you can get parts. You'll still have to measure the drum diameter and width to help with buying parts.
 
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