69 Satelite,528 hemi. This is mainly a street car and still uses a modified vb that retains auto function. Short story, went to a regional outlaw track for a fun run/race. Poor track prep, hooked hard on drag radials, got out about 30 ft and the tires broke loose/hooked up again and busted my sprag. In thirty years of street driving and bracket racing, this is the first time that I broke a trans and don't want to repeat it. Would upgrading to the Coan super sprag be a worthwhile investment? Are they just harder to break, or virtually unbrakeable? Do you have to do any other mods to use one? I looked on their site and read the instructions and it is basically a bolt in, I have a good torqueflite guy who builds my transmissions. I really dont know much about automatics, so any advice is welcome! Thanks, Lee.