I know this is mainly about VW axles but there seems to be a few companies modifying the VW/Porsche style axles to fit all kinds of cars.
I had my first real axle failure last weekend and I am now looking into a solution. I have been reading up on this style of axle and this is what I have come up with. I have a MK1 with 100mm axles BTW but most of this can be applied to all VWs.
The shafts come in three basic sizes. There are 25,28,and 33 spline shaft sizes and different lengths to fit various cars. The 25 spline seem to be early rabbit and possibly early MK2 with 90mm CVs. 28spline seem to be the MK2 and late MK1 shafts and the 33 spline seem to be in everything after that.
The CVs themselves are 90mm,100mm,108mm,and 128mm. These come in a gigantic variety of BMW,audi,vw,mercedes,and many other cars. For the most part you can mix and match your inners and outers for whatever suits your fancy as long as you get the ones for the shaft you have.
Now here is the interesting part. Because of the abundance of parts available the mixing and matching in the aftermarket (but still stock oem replacement) parts is pretty interesting. I have a MK1 with 33 spline shafts. Why is this the never made those? Well it would seem that it was cheaper for them to use left over MK3 parts to build the axles and just put them on a shorter shaft.
So wana build some heavier axles? That is what this is all about anyways right?
Here is what I plan on doing. Because I have the 33 spline shafts alread this gives me the option of going to the junkyard and getting some larger outer CVs and putting them on my shaft. To do this I have to get the matching wheel hub that comes from whatever car I get these from. Then I have to machine them down on the lathe so they fit into the MK1 wheel bearing. I will also have to re drill the hubs to four bolt so I can fit my four by 100mm wheels and brakes.
So tomorrow im going to get some VR6 outer CVs and hubs and put them in my car.There may be some other options as well from the audis but I know there are some of these down at the local pick your part and I also know these will be the easiest.