Looking to try to build my 10 bolt to handle about 600hp w/ n2o. Was thinking some moser axles, power trax system, weld the axle tubes on, etc. Is it even possible?

 

The problem tends to be in the ring and pinion gears, not the rest of the rear. I dont think anything else will help it last longer...

 

I had pretty good luck with mine will all stock parts and a solid pinion support & TA girdle. But I am only putting out 450 RWHP. Best 60ft was a 1.53 with a 3.23 gear.

Now I have the rear apart the posi unit started popping going around turns. Pulled off the cover and found some metal teeth broke off. Very minor ships but still broken parts. It wasn't going to get any better.

But I do have an A4 so don't think any of this will help you out.