When TC's manufacturing tolerances leaned in the wrong direction a condition was created that applies too much stress across the grain at the stocks' weakest point. When the barrel is lowered into place it pre-stresses the area. When the gun is fired it delivers a blow to that already pre-stressed weakest area. And voila, the typical TC cracked stock.
First thing that needs doing is to remove the source of the imposed stressing of the area.
To do that, make sure that the barrel isn't snapping into place when returned to the stock. If the bottom of the hooked breech is camming on the wood when it is lowered into position then it is imposing that stress across the grain, trying to pull it apart. Bed the tang in the position the barrel dictates rather than the position that the tang screw tightens it down into.
In 2017 to repair a badly cracked .54 Renegade I used epoxy and a long wood screw. The crack was cleaned and epoxy added followed by binding it closed. The hole was drilled and the screw was added down the hole filled with epoxy while the bindings holding the pieces together were still in place. The hooked breech was also bedded. The screw was cut off flush with the wood after curing. The cause of the cracking and the crack itself were both addressed at one time, stronger than the day it left the factory and the factory defect corrected.