How much power will the stock axels handle? Whats the best way to go stronger 28 spline or do the 31 spline

 

Not sure on exact power numbers, but with simple bolt ons and a professional tune I know two people that broke axles using drag radials. The axles are held to the rear gears with a clip, but not easy to get to unless you have decent mech skills. Going to have to take off rear brake assemblies and pull out hubs, remove pumpkin housing and disconnect axels. From there slide em out and slide in new ones. Remember to grab new rear diff fluid and a good sealer for the pumpkin.

Suggest 32 spline moog from some others recommendations.

 

You can easily snap them with bolt ons and DRs if you're aggressive. Moser 31 spline with Trak loc diff with welded tubes can easily take you into the 10s with no issue.