Case 450 discontinued ring gear

[Ramsey1276]

Hi guys long time now ramsey before stressfree had to reregister . Twin discs moth balled fiber gear that connects to torque converter.I was fortunate to get last used one in world.so was going to rebuild engine and put tracks on but if gear goes again it’s now a paper weight.what newer machine would replace power unit might get something with bad tracks ect.