You will break things like stripping the spines off the axles. I would never weld a diff in a street car. Only for straight line purpose built drag.
__________________
2005 Evo MR
715whp/595tq @ 50.5psi
10.1@143.3mph
Stock ECU
Pro Tuner
www.ttp-engineering.com
Mustang Dyno AWD-500-SE