Decoupler

Since I had taken the VC out, I had to have a way to disconnect the front differential. The driveline will bind up quickly on dry paved roads and it becomes really hard to make a turn.
After some research on the web, I found out that there is a choice of two systems, one is like the original system used by VW and it is manufactured in South Africa, it looks like the strongest of the two. The other is made in the USA and uses the original splined sleeve that is in every Syncro, they added a bearing onto the sleeve which is moved by a shift fork.
It looked like I could make either one of them myself, the SA one would be the hardest to make,but I really liked the design.
So I gave it a try, I got a piece of 4340 bar stock, machined it and put splines on it in the milling machine. I ended up making two of them, the first one I screwed up trying to heat treat it myself. Some things are best left to an expert.
The hardest part for me to make myself was the internal spline of the gear hub, I ended up using an old fashioned shaper with an index.

The sliding collar (the part that I thought would be the hardest to make) came from a Chev S10 front differential, it just fitted in the housing. I made a shift fork out of a slice of bronze bar stock, drilled the housing for the shift rod and electrical switch and made a bracket for the vacuum actuator.
I had the shaft and gear heat treated, pressed a needle bearing into the shaft and fitted it all together.