[Tony Corley]

If you look at the bottom of the section you quoted, it refers you to General Regulations section 2:11 You can go there and read the rest of the rules regarding rearends, Basically states welded spider gears illegal, aftermarket axles and safety retention device required anytime spool is used, regardless of ET. Also lists all classes that require aftermarket axles and retention devices..... basically anything 10.99 or quicker. Otherwise C-Clips are legal.