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I have gone as high as 30k. When it let go I had about 8k behind me. The programmer was set to tow mode which gives a pretty firm shift. On the 1-2 Shift the sprag blowed up. I am trying to upload the pic. It ate enough to trash the unit.

I have a 99 550 with 4.88. I’ve been running the GV for a couple years with no issues other than a lot of clutch material in the oil. The GV gave me the perfect cruse ratio. I went from 70 mph @ 2700rpm down to 2050rpm. I have been running the GM#12346190. I serviced it last week and GV...