I am installing 3500 ssf converter. I already have 4.10's. I know about my rear end snapping. so what can I do to my rear end or what mods can I buy to strengthen my ten blot if I don't have enough money for a new 12 bolt

 

use a good rear end cover... TA, MAC etc...
and use good gear oil etc... i dont think theres much else you can do?
pray, knock on wood, launch real easy? (scratch the last one)

 

I believe what kills the rear end is shock loads
(like from wheel hop between a high shaft
torque / inertia and sticky tires, making your
axles torsion bars and your chunk a ringing
bell).

Suppressing hard jerk by driving (smooth launch)
technique and hop by setup (LCA relo brackets,
maybe torque arm) would seem sensible. But
"soft" good-60' launch on a high-power M6 just
means you replace clutches instead of rear end
pieces from what I gather....

 

Staying with stock tires will help. Slicks mean death for a 10 bolt.