Early Ford Spindles fitting early Ford axles - Hot Rod Forum : Hotrodders Bulletin Board
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Old 11-09-2007, 10:16 AM
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Early Ford Spindles fitting early Ford axles

There is always a cloud of misinformation floating over any discussion of early(28-48 Passenger and 28-47 Pickup) Ford front axle components, particularly the axles and spindles.

The kingpins used on 28-28 axles on passenger cars and pickups(1/4 & 1/2 ton) are the same diameter and so will fit all the axles under these specified vehicles. The differences lie in length, location of locator slot, and configuration of the top of the pin.

Any of the 28-48 Passenger and 28-47 Pickup spindles will fit any of the 28-48 Passenger and 28-47 Pickup axles, just use the kingpin set which is correct for the spindles you have. Of course most changes will be using the 37038 spindles on earlier axles rather than the early spindles on late axles.

The 28-36 kingpins have mechanical brake rod cups on top of them. These pins can be replaced by 37-41 or 42-48 flat top kingpins by simply grinding a correct locator slot in them for the spindle being used and matching the lengths as closely as possible.

Spindles 28-31 have a knuckle on them where the steering arms bolt on similar to the much later 48-52 pickups. They have integral steering balls and use spring-loaded tie rod ends.
32-34 Spindles have steering arms as part of the spindle (2 on the left and i on the right) and use round replaceable steering balls and spring-loaded tie rod ends.
35-40 spindles have steering arms as part of the spindles (1 on each side, the RH having 2 eyes) and use conventional tapered shaft tie rods ends.

Spindles break down as follows:
28-31 Model A Passenger and Pickup
32-34 Ford Passenger and Pickup
35-36 Ford Passenger and Pickup(although there are a 35 and a 36, they are interchangeable)
37-41 Ford Passenger and Pickup
42-48 Ford Passenger and 42-47 Pickup

28-36 spindles have a longer stub axle than the 37-48 spindles and a smaller flange where the brake backing plates mount.
37-41 spindles are known as round-flange spindles.
42-48 spindles are known a square flange spindles.

Front hub and brake drum assemblies from 37-39(nowadays popularly called "wide-5"), 40-41, and 42-48 will fit directly fit all spindles from 37-48 with no change of bearings or seals required. They will fit 28-36 spindles using bearing spacers with no change in bearings or seals.

Hydraulic brake backing plates from 39-41 and 42-48 will fit all 37-48 spindles
and will fit the 28-36 spindles with centering rings and modifying the mounting holes by slotting them down to fit the smaller bolt pattern on the flanges.

Of course the later F-1 and F100 brakes, as well as the early Lincoln brakes, can be adapted to the spin dles as well but there are many posts describing this change.

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Old 11-25-2007, 06:37 PM
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This is good information for a lot of rodders with older straight vehicles
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Old 08-09-2012, 08:50 AM
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OK, beat me up for resurrecting an old thread . . . . . . . . OK, now that that is done, please interpret these early Ford hubs. Red one on right has larger OD inner bearing, same outer bearing as the two rusty ones on the right. It also has a smaller OD flange. The middle one has that funny neck but is otherwise dimensionally a match of the one on the right. The one on the right has bosses under the lug bolts so I am assuming brake drums when on the back of the spindle?

To make a short story long, I need one more of the one on the right with the bosses. Anyone have one they could spare? I have two of the red ones that are like new, would be glad t trade them for a good right one.

If anyone needs the center one (it is pretty pitted but bearings are good), I will give it to them.


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Old 08-14-2012, 07:20 PM
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A great reference, please correct your second sentence (28 - 28)

37-41 spindles are known as round-flange spindles.
42-48 spindles are known a square flange spindles.
............ Please describe the difference.

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