Welding up cracks in 4-speed shifter

mcodecuda said
I agree. Those parts are hardened so they will crack again.

Can you not re-harden with a quench after welding?

1) heat red hot and let cool naturally to anneal.
2) grind and weld.
3) heat red hot & quench in oil.
4) heat blue hot & quench in water.

Would this not be acceptable if hardening is a concern?