Houtan
Member
I`m in middle restoration my 1974 century gran sport 455 stage 1, now I found out previous owner had changed the transmission and installed a BC-69 th400 on the car (from a 430 Wildcat or Electra), I know BB-70 are unique and different with other BBs but want to know what is differences between BC-69 and BB-74 th400s and can I made some changes on my BC-96 and reach BB-74 specs or maybe BB-70 specs? or I must search for BB transmossions because finding exact BB th400 any year will be a hard and maybe impossible task in our country. If anyone have some map, blueprint, manual or pictures that shows internal parts of those two type th400 it will be very helpful.