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I am having this same issue but mine will not lock up until 56 mph. I know this thread is a couple years old. Did you ever get an answer?

Hey Russ K I'm trying to find the info on the GenIII but cant find it is there anyway you can send to me. Thanks in advance

Ok so I'm new to hp tuners and I have a 1998 Silverado Z71 with a 5.3 swap, it used to have a 6.0 but I swapped in the 5.3 but now while driving mainly in 3rd and 4th (its a manual) It doesn't want...