chassie dyno question
 

So i took car to dyno to tune.
500ci and powerglide trans

First run i slowly brought up rpm to 1/2 throttle and let off, all was well made 505 hp
Second run adjusted main jet and throttle cable to get wot.
Put car in hi rev to 2500 and then stomped it. Got the shut down signal from dyno operator. Trans/converter not transfering power to wheels. Tried another run and same problem, any suggestions where to start, fluid clean and not hot. Trans and converter just freshened up at manufacter. They said auto trans and chassie not good together.
Thanks for any suggestions where to start
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no reason to put car in reverse to stall a convertor it is going to slip till rpm is reached may need to have convertor checked because sometimes they need adjustment