Hello Tony,
After a few years of building shifters for Viper's, B&M figured out that the external stops they incorporated on their shifters was redundant and completely stopped using them all together. This was due to the fact the T56 has internal stops built into the unit. If your using another brand of shifter and the transmission has been rebuilt, most likely you may need to readjust/recheck the external stops. I'd wager quite a few transmission problems go incorrectly diagnosed because someone has adjusted the stops incorrectly. This is not to say your problem wasn't transmission related to start with because I know your very knowledgeable. Thanks again for providing the P/S bracket and the muscle for Ward's Viper @ BG, Tony!