I have 1 51 1/2 ton with a 54 235 and a cast iron power glide...also running a 6 volt starter with the 12 volt conversion system...all works except the teeth on the flex plate look chewed up when I look through the starter hole...haven't pulled it apart yet but suspect maybe the flex plate is the later one for 12 volt starter ? my research says I need the early flex plate with 139 teeth used through 54...the casting on the trans says it was built in 54 and the block casting on the engine indicates 54 as well...guess I wont know if I have the correct flexplate until I get it apart but the teeth are still bad...having har dtime finding a replacement but have heard some people either weld the teeth up and refile them or some people weld on a new ring gear...anybody have suggestions on this ?