Pulled together enough parts from a couple of axles, to rebuild mine. Well, I did have to buy some parts as well. Anyway, first job is to clean up all the old parts, which had been laying in 600W gear oil for many years. Then lay out the parts and begin assembly.
Assembly starts with attaching the bronze ring gear to one side of the differential housing.
Here is a look at the inside of the differential housing. I didn't know that there were two types of spiders made by Ford. I found that the 2-gear spider was pre-1923 and the 4-gear spider was from 1923-27. From what I have been able to read, Ford made the change to improve durability. My truck, being 1926, uses the 4-gear spider.
Anyway, the axle is dropped through the diff housing half, threaded end first. Then the spider is placed on top and the teeth engaged with the fear on the end of the axle. Here are the axles.
Here is a closer look at the gear on the end of the axle, that meshes with the spider
Here are both diff housing halls, and associated hardware
The other half of the diff housing gets its axle same as the first side. Then the diff housing halves are bolted together, trapping the axle gears and spider inside. This is why you cannot remove Model TT axles without completely disassembling the rear axle. Here is what it looks like at this point:
Next, one of the axle housings is stood up on end and braced to receive the diff/axle assembly. Here are the axle housings
Here is the diff/axle assembly dropped into one of the axle housings
The worm gear assembly is added at this time. It consists of the worm gear, front and rear roller bearings, and thrust bearings.
First the roller bearings go into each end and the sleeves are added over the roller bearings
Next is the thrust bearings
Additional views
Here is another look at the worm installed in the axle housing
Now the other axle housing is dropped on from above, and the two halves loosely bolted together. The entire assembly is laid down horizontally and fully bolted together.
A little black spray paint to make it pretty
An oil seal is fitted over each axle and down into the housing about a foot.
Then its time for the outer roller bearing and sleeve.
The sleeve is driven into the axle housing, and a bump on the sleeve engages a hole in the axle housing. This clocks the sleeve, so a hole in its side lines up with the grease cup (old-fashioned zerk fitting) on the outside of the housing. This way grease can get through the sleeve and into the roller bearing.
The roller bearing is installed
Still some stuff to add, such as the spring perches, backing plates and the entire brake assembly. Then it goes back into the truck and the drive shaft, torque tube and radius rods must be cut to length and installed. Then all the engine electrical, exhaust, and a hundred other things need to be done. I figure I'm about a month away from driving it.