Early on in my restoration of my challenger I noticed a severe RPM drop off between 2nd and 3rd gear...figured out a 833 overdrive had been installed...figured out I would just deal with it coming back from cruise in severe noise emulated from under car with severe bucking under acceleration...had it towed to my mechanic buddy he said the trans was fried..thanks for your input brewers is building me a REAL 4 speed but it's a 8 week wait.