Transmission shield or tunnel cover
The 727/904 is a good trans ,the problem is not at high speed but in 1st gear the rear overrunning clutch could be damaged from the shock of the burn out or even broken rear end , dont ever do a burnout in 1st gear , use 3 gear . I do first dry hop in second gear to make sure tires or dry th400 has the same probem . Get the csr sheild or a blanket , metal sheilds have problems with shift linkage . Blankets tend to hang low under trans