Disc brake swap...Help!

[Classic Heartbeat]

The 71-72 Ball joints, and tie rod ends are different than 63-70. There are a couple of ways to do the swap.
You can use your existing engine crossmember and swap out the upper "A" arms, lower "A" arms, tie rods, drag link, and other steering components except the pitman arm.
You can keep your "A" arms and swap out all of the above and change the ball joints.
You can swap out the whole crosmember and all steering components. (This is the way that I do it)

Above adresses the steering only.

Now for the brakes..

If keeping your crossmember, there are a couple of things that you can do. The cheapest and easiest way is to just put an adjustible proportioning valve in between your existing proportioning valve and the rear brakes.

You can use the donor trucks mastercylinder, booster, brake rod, and proportioning valve. Custom bend the vertical brake lines if you are using your front crossmember.

If using the donor trucks complete front crossmember with everything atached you can do the following.

You can use the donor trucks mastercylinder, booster, brake rod, and proportioning valve, if the brake lines are in good shape use all of them including the vertical ones. If not, bend your own or purchase pre-bent ones.

If using your mastercylender/ booster assembly. Custom bend the vertical brake lines and put an adjustible proportioning valve in between your existing proportioning valve and the rear brakes.

There may be a few steps left out but this gives you what you need to use and or buy. WES