Thanks, I just called a Chevy dealer and they ran the VIN and found out my build code for the tranny is MT1. According to ChevyHighPerformance site, build code MT1 is the 4L80-E. Odd thing, Wikipedia says the 4L80E is for up to 8000 lb GVRW, but this motorhome is listed as 12,300 lb. Must be more to it. Maybe Wikipedia is wrong on that.
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