I put a street fighter C-4 in my 69 a while back, and had nothing but problems with it. They sent it to me with a bad valve body in it, and they sent a torque converter that was stamped with the right part number, but it was the wrong one. After getting those two things replaced (meanwhile my car was down for almost a month waiting for them), the tranny ran okay for about 6 months before it started clunking into gears. Then it gave out completely just after a year (which is how long the warranty was), so I was then SOL. Once I got the correct converter, I had no problems with it (meaning converter only). But the tranny was a P.O.S. Supposedly all of their trannys are dyno tested before leaving the factory, yeah, horse crap.
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