Make sure that any axles that you use must have the original parts down to the hardness and sizes of the CV cages etc. Any deviation form stock is illegal.
The real world replacement axles are often the same only in the fitment. The lengths/OD of the axle shaft and sizes of the CV parts(balls cages) are seldom the same as OE. I build race axles for many VW race cars .The cores I get seldom are VW, and the only legal CV joint is the VW/Lobro . That means that most of the VW race cars has out of spec CVs and no body knows or can tell untill you measure the size of my balls
If I were trying to keep IT cars in the class, I would allow any drive system parts to be updated with bigger heavier parts. Diffs, axles/drive shafts etc.
For any cars older than 25yrs.It should be a given .
Out for now, MM
PS ; loose zip tie on the small boot end works fine. Mobil one red synthetic grease, always.
Axle plunge; equal amount of travel left in the axle ass. Any time that you bottom out the CV travel you will break stuff. Back the axle nut off 6 turns and shove the axle end in to the trans. You should have about .5 in of movement for multi ball CVaxles and maybe a little more for tripod style axles.
Do this with the car on the ground and maybe loaded up a little .
Shove the engine around and add stay bar to keep the tighter side form hitting bottom.
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