hi all friends
i have a 1995 blazer 4.3 cpi 4l60e 4wd my problem with my trans. is the tranny would shift fast through the gears and never shift down even i floored it . i was test my car with OTC: Genisys scan tools and show me no Trouble Code stored , every thing good , all solenoid work fine with no problems . but after 1-2 minutes no signal came from trans , the scan tools read the trans is off (read no data ). they told me that the vcm is blowen .
please reply me if any one show something like this and any ony can help me.

something else:
all solenoids new
no mechanical problems
no burn atf and i changed it eith the filter

with regards