Doing front disk upgrade, question about trailing arms

[kraftor80]

Hello,
I am swapping front I-beam, disks and steering (including pitman arm) from a 76 F250 into my 70 F250. My question is the trailing arms look different. The 70 is cast and the 76 is pressed? Otherwise they seem the same. Can I swap them too? I see no mention of trailing arms in the tech data on disk break swap.

[69rangerf100]

the radius arms you can either use the stock 70 or switch to the 76 arms doesnt matter they are the same length. i lucked out and got a donor 73 disk setup so i am able to keep my i beams and just put the 73 spindles on since the kingpin size is the same

[FORDification]

You can use the '73-'79 radius arms on your bumpside, but if you do, you also have to use the matching front springs. The dentside springs use a different spring cup that won't sit right on the early forged-steel radius arm. You'll be fine as long as you keep use the springs and radius arms as a package, don't mix.

[kraftor80]

Thanks very much! I was going to keep the 70 springs as they have more turns so I suspect they will be a bit better riding.
*
The 70 spring ......................The 76 spring

Both seem to have the same length, but the 76 springs have these blocks wedged in. I am guessing this is a method of raising the front a bit either springs compressed over time, or someone wanted it a bit higher.

The spring block.

[69rangerf100]

yeah my front end had those on it i think my dad had put them in at one point since they were factory springs on it

[fordman]

i thought you could use what ever springs you wanted as long as the cups matched the springs. wont the cups fit on either style or radius arm?